0001260221-23-000081 | 10-K | XBRL Viewer

ACQUISITIONS AND DIVESTITURES

12 Months Ended

Sep. 30, 2023

Acquisitions

Calspan Corporation – On March 14, 2023, the Company entered into a definitive agreement to acquire all the outstanding stock of Calspan Corporation (“Calspan”) for a total purchase price of $729 million. The acquisition was completed on May 8, 2023 and financed through existing cash on hand. Calspan operates from seven primary facilities within the United States and is a leading independent provider of proprietary highly engineered testing and technology development services and systems primarily for the aerospace and defense industry. Calspan’s state of the art transonic wind tunnel is used across a range of important aftermarket-focused development activities for both the commercial and defense aerospace end markets. The services and systems are primarily proprietary with significant aftermarket content. Calspan's operating results are included within TransDigm's Airframe segment.

As of September 30, 2023, the measurement period (not to exceed one year) is open; therefore, the assets acquired and liabilities assumed related to the Calspan acquisition are subject to adjustment until the end of the respective measurement period.

The Company is in the process of finalizing a third-party valuation of property, plant and equipment and certain intangible assets of Calspan. The allocation of the purchase price is preliminary and will likely change in future periods, perhaps materially, as fair value estimates of the assets acquired and liabilities assumed are finalized, including those related to deferred taxes and income taxes. We utilized both the cost and market approaches to value property, plant and equipment, which consider external transactions and other comparable transactions, estimated replacement and reproduction costs, and estimated useful lives and consideration for physical, functional and economic obsolescence. The fair values of acquired intangibles are determined based on an income approach, using estimates and assumptions that are deemed reasonable by the Company. Significant assumptions include the discount rates and certain assumptions that form the basis of the forecasted results of the acquired business including revenue, earnings before interest, taxes, depreciation and amortization (“EBITDA”), growth rates, royalty rates and technology obsolescence rates. These assumptions are forward looking and could differ from future economic and market conditions.

Pro forma net sales and results of operations for the Calspan acquisition had it occurred at the beginning of the fiscal years ended September 30, 2023 or September 30, 2022 are not material and, accordingly, are not provided.

The allocation of the estimated fair value of assets acquired and liabilities assumed in the Calspan acquisition as of the May 8, 2023 acquisition date, as well as measurement period adjustments recorded within the permissible one year measurement period, are summarized in the table below (in millions):


	Preliminary		Measurement Period		Adjusted Preliminary
	Allocation		Adjustments (2)		Allocation
Assets acquired (excluding cash):
Trade accounts receivable	$	39	$	—	$	39
Inventories	2		—		2
Prepaid expenses and other	40		—		40
Property, plant and equipment	105		278		383
Goodwill	367		(123)		244		(1)
Other intangible assets	243		(151)		92		(1)
Other non-current assets	7		—		7
Total assets acquired (excluding cash)	803		4		807
Liabilities assumed:
Accounts payable	10		(1)		9
Accrued and other current liabilities	50		—		50
Deferred income taxes	8		5		13
Other non-current liabilities	6		—		6
Total liabilities assumed	74		4		78
Net assets acquired	$	729	$	—	$	729

(1)Of the approximately $244 million of goodwill recognized for the acquisition, the Company expects that approximately $218 million will be deductible for tax purposes. Of the approximately $92 million of other intangible assets recognized for the acquisition, the Company expects that approximately $86 million will be deductible for tax purposes. The goodwill and intangible assets are expected to be deductible over 15 years.

(2)Measurement period adjustments primarily related to the adjustments in the fair values of the acquired property, plant and equipment and other intangible assets from the third-party valuation. A substantial portion of the measurement period adjustments to property, plant and equipment relates to the fair value of the transonic wind tunnel. The offset to the measurement period adjustments was to goodwill.

DART Aerospace – On May 25, 2022, the Company acquired all the outstanding stock of DART Aerospace (“DART”) for a total purchase price of $359 million in cash, net of a working capital settlement received in the fourth quarter of fiscal 2022 of approximately $1 million. The acquisition was financed through existing cash on hand. DART operates from four primary facilities and is a leading provider of highly engineered, unique helicopter mission equipment solutions that predominantly service civilian aircraft. The products are primarily proprietary with significant aftermarket content. DART's operating results are included within TransDigm's Airframe segment.

Pro forma net sales and results of operations for the DART acquisition had it occurred at the beginning of the fiscal year ended September 30, 2022 are not material and, accordingly, are not provided.

The final allocation of the fair value of assets acquired and liabilities assumed in the DART acquisition as of the May 25, 2022 acquisition date, as well as measurement period adjustments recorded within the permissible one year measurement period, are summarized in the table below (in millions):


	Preliminary		Measurement Period		Final
	Allocation		Adjustments (2)		Allocation
Assets acquired (excluding cash):
Trade accounts receivable	$	16	$	(2)	$	14
Inventories	33		(1)		32
Prepaid expenses and other	4		—		4
Property, plant and equipment	9		—		9
Goodwill	236		(31)		205		(1)
Other intangible assets	112		36		148		(1)
Other non-current assets	8		9		17
Total assets acquired (excluding cash)	418		11		429
Liabilities assumed:
Accounts payable	4		—		4
Accrued and other current liabilities	11		3		14
Deferred income taxes	35		—		35
Other non-current liabilities	8		9		17
Total liabilities assumed	58		12		70
Net assets acquired	$	360	$	(1)	$	359

(1)None of the approximately $205 million of goodwill and $148 million of other intangible assets recognized for the acquisition is deductible for tax purposes.

(2)Measurement period adjustments primarily related to the adjustments in the fair values of the acquired other intangible assets from the third-party valuation. The offset was to goodwill.

Extant Aerospace Acquisitions – For the fiscal year ended September 30, 2023, the Company's Extant Aerospace subsidiary, which is included within TransDigm’s Power & Control segment, completed a series of acquisitions of substantially all of the assets and technical data rights of certain product lines, each meeting the definition of a business, for a total purchase price of $24 million. The allocation of the purchase price remains preliminary and will likely change, though not materially, in future periods up to the expiration of the respective one year measurement period as fair value estimates of the assets acquired and liabilities assumed are finalized. The Company expects that all of the approximately $12 million of goodwill and $6 million of other intangible assets recognized for the acquisitions will be deductible for tax purposes over 15 years.

For the fiscal year ended September 30, 2022, the Company's Extant Aerospace subsidiary, which is included in TransDigm’s Power & Control segment, completed a series of acquisitions of substantially all of the assets and technical data rights of certain product lines, each meeting the definition of a business, for a total purchase price of $88 million, of which $10 million was paid using existing cash on hand in the first quarter of fiscal 2023. All of the approximately $61 million of goodwill and $37 million of other intangible assets recognized for the acquisitions is deductible for tax purposes over 15 years.

Acquisitions completed by the Company’s Extant Aerospace subsidiary in fiscal 2021 were not material.

Pro forma net sales and results of operations for the Extant product line acquisitions, had they occurred at the beginning of the fiscal years ended September 30, 2023, September 30, 2022 or September 30, 2021 are not material and, accordingly, are not provided.

Cobham Aero Connectivity – On November 24, 2020, the Company entered into a definitive agreement to acquire all the outstanding stock of Chelton Limited, Chelton Avionics Holdings, Inc. and Mastsystem Int'l Oy, collectively, Cobham Aero Connectivity (“CAC”), for a total purchase price of $945 million. The acquisition was substantially completed on January 5, 2021 and financed through existing cash on hand. The Company completed the remainder of the acquisition of CAC on February 12, 2021, also through existing cash on hand. CAC operates from two primary facilities (Marlow, United Kingdom and Prescott, Arizona) and is a leading provider of highly engineered antennas and radios for the aerospace end market. The products are primarily proprietary with significant aftermarket content and have a strong presence across major defense platforms as well as select commercial applications. CAC's operating results are included within TransDigm's Airframe segment.

Pro forma net sales and results of operations for the CAC acquisition had it occurred at the beginning of the fiscal year ended September 30, 2021 were not material and, accordingly, are not provided.

The final allocation of the fair value of assets acquired and liabilities assumed in the CAC acquisition as of the acquisition dates is summarized in the table below (in millions):


	Final
	Allocation
Assets acquired (excluding cash):
Trade accounts receivable	$	32
Inventories	29
Prepaid expenses and other	7
Property, plant and equipment	21
Goodwill	697		(1)
Other intangible assets	324		(1)
Other non-current assets	31
Total assets acquired (excluding cash)	1,141
Liabilities assumed:
Accounts payable	18
Accrued and other current liabilities	44
Deferred income taxes	31
Other non-current liabilities	103
Total liabilities assumed	196
Net assets acquired	$	945

(1)Of the approximately $697 million of goodwill recognized for the acquisition, approximately $65 million is deductible for tax purposes. Of the approximately $324 million of other intangible assets recognized for the acquisition, approximately $105 million is deductible for tax purposes. The goodwill and other intangible assets are deductible over 15 years.

The Calspan, DART, Extant Aerospace product line and CAC acquisitions completed by the Company strengthen and expand the Company’s position to design, produce and supply highly engineered proprietary aerospace components in niche markets with significant aftermarket content and provide opportunities to create value through the application of our three core value-driven operating strategies (obtaining profitable new business, continually improving our cost structure, and providing highly engineered value-added products to customers). The purchase prices paid reflect the current EBITDA and cash flows, as well as the future EBITDA and cash flows expected to be generated by the businesses, which are driven in most cases by the recurring aftermarket consumption over the life of a particular aircraft, estimated to be approximately 25 to 30 years.

Subsequent Event – On November 9, 2023, the Company announced that it entered into a definitive agreement to acquire the Electron Device Business of Communications & Power Industries (“CPI”), a portfolio company of TJC, L.P., for approximately $1,385 million in cash. CPI’s Electron Device Business is a leading global manufacturer of electronic components and subsystems primarily serving the aerospace and defense market. Its products are highly engineered, proprietary components with significant aftermarket content and a strong presence across major aerospace and defense platforms. The acquisition is expected to close by the end of TransDigm's third quarter of fiscal 2024, subject to regulatory approvals in the United States and United Kingdom and customary closing conditions. The acquisition is expected to be financed through a combination of existing cash on hand and new long-term debt.

Divestitures

ScioTeq and TREALITY Simulation Visual Systems – On June 30, 2021, TransDigm completed the divestiture of the ScioTeq and TREALITY Simulation Visual Systems businesses (“ScioTeq and TREALITY”) for approximately $200 million in cash. ScioTeq and TREALITY were acquired by TransDigm as part of its acquisition of Esterline Technologies Corporation (“Esterline”) in March 2019 and were included in TransDigm’s Airframe segment.

Technical Airborne Components – On April 27, 2021, TransDigm completed the divestiture of the Technical Airborne Components business (“TAC”) for approximately $40 million in cash. TAC was included in TransDigm’s Airframe segment.

The net gain on sale recognized in fiscal 2021 as a result of the ScioTeq and TREALITY and TAC divestitures was approximately $68 million, which was classified as a component of gain on sale of businesses-net within the consolidated statements of income. During fiscal 2022, the Company received approximately $3 million in cash proceeds related to a final working capital settlement for the ScioTeq and TREALITY divestiture. These proceeds are classified as a component of gain on sale of businesses-net in the consolidated statements of income.

Racal Acoustics – On January 29, 2021, TransDigm completed the divestiture of the Racal Acoustics business (“Racal”) for approximately $20 million in cash. Racal was acquired by TransDigm as part of its acquisition of Esterline in March 2019 and was included in TransDigm's Non-aviation segment. The gain on sale recognized in fiscal 2021 as a result of the divestiture is not material and was classified as a component of gain on sale of businesses-net in the consolidated statements of income.

Avista, Inc. – On November 17, 2020, TransDigm completed the divestiture of the Avista, Inc. business (“Avista”) for approximately $8 million in cash. Avista was acquired by TransDigm as part of its acquisition of Esterline in March 2019 and was included in TransDigm's Airframe segment. The gain on sale recognized in fiscal 2021 as a result of the divestiture was not material and is classified as a component of gain on sale of businesses-net in the consolidated statements of income.

ACQUISITIONS AND DIVESTITURES - Divestitures (Details) - USD ($) $ in Millions					12 Months Ended
	Jun. 30, 2021	Apr. 27, 2021	Jan. 29, 2021	Nov. 17, 2020	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Business					$ 0	$ 7	$ 69
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent					$ 0	1	$ 0
ScioTeq and TREALITY
Business Acquisition [Line Items]
Divestiture, Sale Price	$ 200
TAC
Business Acquisition [Line Items]
Divestiture, Sale Price		$ 40
Scioteq, Treality, and TAC
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Business						68
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent						$ 3
Racal
Business Acquisition [Line Items]
Divestiture, Sale Price			$ 20
Avista
Business Acquisition [Line Items]
Divestiture, Sale Price				$ 8

- Definition

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

+ References + Details

STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

Weighted Average Assumptions for all Options Granted Estimated at Grant Date Using Black-Scholes-Merton Option-Pricing Model

The fair value of the Company’s employee stock options was estimated at the date of grant or modification using a Black-Scholes option-pricing model with the following weighted average assumptions for all options granted during the fiscal years ended:


	Fiscal Years Ended September 30,
	2023	2022	2021
Risk-free interest rate	3.45% to 4.20%	1.47% to 2.97%	0.42% to 0.86%
Expected life of options	6.5 years	6.5 years	5.5 years
Expected dividend yield of stock	—	—	—
Expected volatility of stock	32.5%	37.0% to 38.0%	36.0%

Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity

The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2023:


	Number of Options	Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2022	—	$	—
Granted	223,945	627.81
Exercised	—	—
Forfeited	—	—
Expired	—	—
Outstanding at September 30, 2023	223,945	$	627.81	9.2 years	$	48,220,048
Expected to vest	85,948	$	627.36	9.2 years	$	18,545,000
Exercisable at September 30, 2023	41,269	$	631.65	9.3 years	$	8,727,648

The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2023:


	Number of Options	Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2022	4,302,706	$	424.54
Granted	374,965	598.84
Exercised	(312,555)	323.15
Forfeited	(117,875)	580.76
Expired	(920)	610.00
Outstanding at September 30, 2023	4,246,321	$	443.02	5.9 years	$	1,698,993,209
Expected to vest	934,190	$	591.97	7.9 years	$	234,631,160
Exercisable at September 30, 2023	3,065,412	$	385.97	5.1 years	$	1,401,378,878

The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2023:


	Number of Options	Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2022	1,082,985	$	193.05
Granted	—	—
Exercised	(632,793)	179.93
Forfeited	—	—
Expired	—	—
Outstanding at September 30, 2023	450,192	$	211.49	1.8 years	$	284,357,481
Exercisable at September 30, 2023	450,192	$	211.49	1.8 years	$	284,357,481

EARNINGS PER SHARE (Tables)

12 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share (two-class method)

The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share data) using the two-class method:


	Fiscal Years Ended September 30,
	2023		2022		2021
Numerator for earnings per share:
Income from continuing operations	$	1,299	$	866	$	681
Less: Net income attributable to noncontrolling interests	(1)		(1)		(1)
Net income from continuing operations attributable to TD Group	1,298		865		680
Less: Dividends paid on participating securities	(38)		(86)		(73)
Income from discontinued operations, net of tax	—		1		—
Net income applicable to TD Group common stockholders—basic and diluted	$	1,260	$	780	$	607
Denominator for basic and diluted earnings per share under the two-class method:
Weighted-average common shares outstanding	54.9		54.8		54.8
Vested options deemed participating securities	2.3		3.4		3.6
Total shares for basic and diluted earnings per share	57.2		58.2		58.4

Earnings per share from continuing operations—basic and diluted	$	22.03	$	13.38	$	10.41
Earnings per share from discontinued operations—basic and diluted	—		0.02		—
Earnings per share	$	22.03	$	13.40	$	10.41

RECENT ACCOUNTING PRONOUNCEMENTS	12 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Sep. 30, 2023
Accounting Standards Update and Change in Accounting Principle [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2020-04, “Reference Rate Reform.” Certain amendments were provided for in ASU 2021-01, “Reference Rate Reform (ASC 848): Scope,” which was issued in January 2021, and ASU 2022-06, “Reference Rate Reform (ASC 848): Deferral of the Sunset Date.” ASU 2021-01 provides optional guidance for a limited period of time to ease potential accounting impacts associated with transitioning away from reference rates that are expected to be discontinued, such as the London Interbank Offered Rate (“LIBOR”). The amendments in this ASU apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued. As a result of ASU 2022-06 deferring the sunset date, ASC 848 is effective through December 31, 2024. During the second quarter of fiscal 2023, the Company entered into LIBOR to Term Secured Overnight Financing Rate (“Term SOFR”) basis interest rate swap and cap agreements to effectively convert its existing swaps and caps from LIBOR-based to Term SOFR-based. The practical expedients permissible under ASC 848 were applied and resulted in the Company preserving the presentation of its existing swaps and caps as qualifying cash flow hedges. Refer to Note 21, “Derivatives and Hedging Activities,” for further disclosure of the hedging transactions entered into during the second quarter of fiscal 2023. The application of this standard did not have a material impact on the Company's consolidated financial statements and disclosures. In October 2021, the FASB issued ASU 2021-08, “Business Combinations (ASC 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers.” ASU 2021-08 requires that an acquirer recognize and measure contract assets and liabilities acquired in a business combination in accordance with “ASU 2014-09, Revenue from Contracts with Customers (ASC 606).” This standard is effective for annual periods beginning after December 15, 2022, including interim periods therein, with early adoption permitted. The guidance will be applied prospectively to acquisitions occurring on or after the effective date. The impact of this guidance will depend on the contract assets and liabilities acquired in future business combinations. In October 2023, the FASB issued ASU 2023-06, “Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative,” to amend certain disclosure and presentation requirements for a variety of topics within the ASC. These amendments align the requirements in the ASC to the removal of certain disclosure requirements set out in Regulation S-X and Regulation S-K, announced by the SEC. The effective date for each amended topic in the ASC is either the date on which the SEC’s removal of the related disclosure requirement from Regulation S-X or Regulation S-K becomes effective, or on June 30, 2027, if the SEC has not removed the requirements by that date. Early adoption is prohibited. The Company does not expect that the application of this standard will have an impact on our consolidated financial statements and disclosures.

- Definition

The entire disclosure for change in accounting principle. Includes, but is not limited to, nature, reason, and method of adopting amendment to accounting standards or other change in accounting principle.

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Reference 24: http://www.xbrl.org/2003/role/disclosureRef
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Reference 25: http://www.xbrl.org/2003/role/disclosureRef
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Reference 26: http://www.xbrl.org/2003/role/disclosureRef
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Reference 27: http://www.xbrl.org/2003/role/disclosureRef
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Reference 28: http://www.xbrl.org/2003/role/disclosureRef
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Reference 29: http://www.xbrl.org/2003/role/disclosureRef
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Reference 30: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

ACQUISITIONS AND DIVESTITURES - Cobham Aero Connectivity (Details) - USD ($) $ in Millions		12 Months Ended
	Jan. 05, 2021	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 762	$ 437	$ 963
GOODWILL		8,988	8,641	$ 8,568
Purchase price allocation adjustments (1)		$ 7	$ 3
Minimum [Member]
Business Acquisition [Line Items]
Estimated useful life of aircraft (in years)		25 years
Maximum [Member]
Business Acquisition [Line Items]
Estimated useful life of aircraft (in years)		30 years
Cobham [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 945
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables		$ 32
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory		29
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets		7
Property, plant, and equipment		21
GOODWILL		697
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill		324
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets		31
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		1,141
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable		18
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other		44
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities		31
Other noncurrent liabilities		103
Business acquisition, assumption of net indebtedness		196
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		$ 945
Business acquisition, Goodwill, Tax Deductible Amount	65
Business acquisition, Intangibles, Tax Deductible Amount	$ 105
Tax benefit recognition period (in years)	15 years

LEASES - Components of Lease Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Lessee, Lease, Description [Line Items]
Lease, Cost	$ 43	$ 39
Operating Expense
Lessee, Lease, Description [Line Items]
Operating Lease, Cost	21	24
Cost of Sales
Lessee, Lease, Description [Line Items]
Finance Lease, Right-of-Use Asset, Amortization	9	6
Interest Expense
Lessee, Lease, Description [Line Items]
Finance Lease, Interest Expense	$ 13	$ 9

DESCRIPTION OF THE BUSINESS	12 Months Ended
DESCRIPTION OF THE BUSINESS	Sep. 30, 2023
Accounting Policies [Abstract]
DESCRIPTION OF THE BUSINESS	DESCRIPTION OF THE BUSINESSTransDigm Group Incorporated (“TD Group”), through its wholly-owned subsidiary, TransDigm Inc., is a leading global designer, producer and supplier of highly engineered aircraft components for use on nearly every commercial and military aircraft in service today. TransDigm Inc., along with TransDigm Inc.’s direct and indirect wholly-owned operating subsidiaries (collectively, with TD Group, the “Company” or “TransDigm”), offers a broad range of proprietary aerospace products. TD Group has no significant assets or operations other than its 100% ownership of TransDigm Inc. TD Group’s common stock is listed on the New York Stock Exchange, or the NYSE, under the trading symbol “TDG.”TransDigm's major product offerings, substantially all of which are ultimately provided to end-users in the aerospace industry, include mechanical/electromechanical actuators and controls, ignition systems and engine technology, specialized pumps and valves, power conditioning devices, specialized AC/DC electric motors and generators, batteries and chargers, engineered latching and locking devices, engineered rods, engineered connectors and elastomer sealing solutions, databus and power controls, cockpit security components and systems, specialized and advanced cockpit displays, engineered audio, radio and antenna systems, specialized lavatory components, seat belts and safety restraints, engineered and customized interior surfaces and related components, advanced sensor products, switches and relay panels, thermal protection and insulation, lighting and control technology, parachutes, high performance hoists, winches and lifting devices, cargo loading, handling and delivery systems and specialized flight, wind tunnel and jet engine testing services and equipment.

INVENTORIES (Tables)

12 Months Ended

Sep. 30, 2023

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventories consist of the following (in millions):


	September 30, 2023		September 30, 2022
Raw materials and purchased component parts	$	1,144	$	959
Work-in-progress	455		359
Finished goods	226		210
Total	1,825		1,528
Reserves for excess and obsolete inventory	(209)		(196)
Inventories—Net	$	1,616	$	1,332

SEGMENTS - Geographic Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,585	$ 5,429	$ 4,798
Long-Lived Assets	1,319	892
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,265	3,496	3,096
Long-Lived Assets	1,063	663
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	2,320	1,933	$ 1,702
Long-Lived Assets	$ 256	$ 229

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-5

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
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-Section 50
-Paragraph 22
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-22

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Name Accounting Standards Codification
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-Paragraph 40
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Reference 8: http://www.xbrl.org/2003/role/disclosureRef
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Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
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-Paragraph 41
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-41

Reference 11: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
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-Section 50
-Paragraph 4
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-4

+ Details

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Statement of Comprehensive Income [Abstract]
Net income	$ 1,299	$ 867	$ 681
Less: Net income attributable to noncontrolling interests	1	1	1
Net Income (Loss) Attributable to Parent	1,298	866	680
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	137	(379)	90
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	20	352	73
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	12	8	(10)
Other comprehensive income (loss), net of tax, attributable to TD Group	169	(19)	153
TOTAL COMPREHENSIVE INCOME ATTRIBUTABLE TO TD GROUP	$ 1,467	$ 847	$ 833

PROPERTY, PLANT AND EQUIPMENT - Schedule of Property, Plant and Equipment (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Abstract]
Land and improvements	$ 119	$ 103
Buildings and improvements	567	461
Machinery, equipment and other	1,334	945
Construction-in-progress	105	78
Total	2,125	1,587
Accumulated depreciation	(870)	(780)
Property, plant and equipment—Net	$ 1,255	$ 807

ACQUISITIONS AND DIVESTITURES - Extant Aerospace (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		$ 762	$ 437	$ 963
Extant Aerospace [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired		24	88
Other Payments to Acquire Businesses	$ 10
Amount of goodwill expected to be tax deductible		12	61
Business Acquisition, Intangible Assets, Expected Tax Deductible Amount		$ 6	$ 37
Business Acquisition, Goodwill and Intangible Assets, Expected Tax Deductible Amount, Period of Deduction		15 years	15 years

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2023
Accounting Policies [Abstract]
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation and Consolidation – The accompanying consolidated financial statements were prepared in conformity with U.S. GAAP and include the accounts of TD Group and subsidiaries. All significant intercompany balances and transactions have been eliminated. Certain reclassifications to the consolidated financial statements and notes have been made to the prior year amounts to conform to the current year presentation, none of which are material. Estimates – The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates. Revenue Recognition – The Company recognizes revenue from contracts with customers using the five step model prescribed in ASC 606. A substantial portion of the Company's revenue is recorded at a point in time basis. Revenue is recognized from the sale of products or services when obligations under the terms of the contract are satisfied and control of promised goods or services have transferred to the customer. Control is transferred when the customer has the ability to direct the use of and obtain benefits from the goods or services. Revenue is measured at the amount of consideration the Company expects to be paid in exchange for goods or services. Refer to Note 5, “Revenue Recognition,” for further details. Shipping and Handling Costs – Shipping and handling costs are included in cost of sales in the consolidated statements of income. Research and Development Costs – The Company expenses research and development costs as incurred and classifies such amounts in selling and administrative expenses. The expense recognized for research and development costs for the fiscal years ended September 30, 2023, 2022 and 2021 was approximately $105 million, $95 million, and $106 million, respectively. Cash Equivalents – The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash equivalents are recorded at cost, which approximates fair value. Allowance for Credit Losses – The Company's allowance for credit losses is the allowance for uncollectible accounts. The allowance for uncollectible accounts reduces the trade accounts receivable balance to the estimated net realizable value equal to the amount that is expected to be collected. The Company’s method for developing its allowance for credit losses is based on historical write-off experience, the aging of receivables, an assessment of the creditworthiness of customers, economic conditions and other external market information. The allowance also incorporates a provision for the estimated impact of disputes with customers. All provisions for allowances for uncollectible accounts are included in selling and administrative expenses. The determination of the amount of the allowance for uncollectible accounts is subject to judgment and estimation by management. If circumstances change or economic conditions deteriorate or improve, the allowance for uncollectible accounts could increase or decrease. Refer to Note 7, “Trade Accounts Receivable,” for further details. Inventories – Inventories are stated at the lower of cost or net realizable value. Cost of inventories is generally determined by the average cost and the first-in, first-out (“FIFO”) methods and includes material, labor and overhead related to the manufacturing process. Provision for potentially obsolete or slow-moving inventory is made based on management’s analysis of inventory levels and future sales forecasts. Refer to Note 8, “Inventories,” for further details. Property, Plant and Equipment – Property, plant and equipment are stated at cost and include improvements which significantly increase capacities or extend the useful lives of existing plant and equipment. Depreciation is computed using the straight-line method over the following general estimated useful lives: land improvements from 10 to 20 years, buildings and improvements from 5 to 30 years, machinery and equipment from 2 to 10 years and furniture and fixtures from 3 to 10 years. Certain exceptions do apply in which an asset will have an estimated useful life outside of the range listed above dependent on, among other things, the nature and condition of the asset. Net gains or losses related to asset dispositions are recognized in earnings in the period in which dispositions occur. Routine maintenance, repairs and replacements are expensed as incurred. Amortization expense of assets accounted for as finance leases is included within depreciation expense. Property, plant and equipment is assessed for potential impairment whenever indicators of impairment are present by determining whether the carrying value of the property can be recovered through projected, undiscounted cash flows from future operations over the property’s remaining estimated useful life. Any impairment recognized is the amount by which the carrying amount exceeds the fair value of the asset. Fair value is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including the discounted value of estimated future cash flows. No material impairments of long-lived assets were recorded in fiscal 2023, 2022 or 2021. Refer to Note 9, “Property, Plant and Equipment,” for further details. Debt Issuance Costs, Premiums and Discounts – The cost of obtaining financing as well as premiums and discounts are amortized using the effective interest method over the terms of the respective obligations as a component of interest expense within the consolidated statements of income. Debt issuance costs are presented in the consolidated balance sheets as a direct reduction from the carrying amount of the related debt obligations. Refer to Note 12, “Debt,” for further details. Financial Instruments – Interest rate swap, cap and collar agreements are used to manage interest rate risk associated with floating rate borrowings under our Credit Agreement. These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the term of the agreements without an exchange of the underlying principal amount. The agreements utilized by the Company effectively modify the Company’s exposure to interest rate risk by converting a portion of the Company’s floating rate debt to a fixed rate basis from the effective date through the maturity date of the respective interest rate swap, cap and collar agreements, thereby reducing the impact of interest rate movements on future interest expense. These derivative instruments qualify as effective cash flow hedges under U.S. GAAP. The Company transacts business in various foreign currencies, which subjects the Company’s cash flows and results of operations to exposure related to changes in foreign currency exchange rates. These exposures arise primarily from purchases or sales of products and services from third parties. Foreign currency forward exchange contracts provide for the purchase or sale of foreign currencies at specified future dates at specified exchange rates, and are used to offset changes in the fair value of certain assets or liabilities or forecasted cash flows resulting from transactions denominated in foreign currencies. For the interest rate swap, cap and collar agreements and the foreign currency forward contracts designated as cash flow hedges, the effective portion of the gain or loss from the financial instruments is reported as a component of accumulated other comprehensive loss in stockholders’ deficit and subsequently reclassified into earnings in the same line as the hedged item in the same period or periods during which the hedged item affected earnings. As the interest rate swap, cap and collar agreements are used to manage interest rate risk, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in interest expense-net in the consolidated statements of income. As the foreign currency forward exchange contracts are used to manage foreign currency exposure primarily arising from sales to third parties, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in net sales in the consolidated statements of income. The cash flows from settled contracts are recognized in net cash provided by operating activities in the consolidated statements of cash flows. Refer to Note 21, “Derivatives and Hedging Activities,” for further details. Business Combinations – In accordance with ASC 805, “Business Combinations,” the Company uses the acquisition method of accounting to allocate costs of acquired businesses to the assets acquired and liabilities assumed based on their estimated fair values at the dates of acquisition. The excess costs of acquired businesses over the fair values of the assets acquired and liabilities assumed were recognized as goodwill. The valuations of the acquired assets and liabilities assumed will impact the determination of future operating results. Determining the fair value of assets acquired and liabilities assumed requires management’s judgment and often involves the use of significant estimates and assumptions, including assumptions with respect to future cash inflows and outflows, revenue growth rates and EBITDA margins, discount rates, customer attrition rates, royalty rates, asset lives and market multiples, among other items. These assumptions were forward looking and could be affected by future economic and market conditions. We determine the fair values of intangible assets acquired generally in consultation with third-party valuation advisors. Fair value adjustments to the Company’s assets and liabilities are recognized and the results of operations of the acquired business are included in our consolidated financial statements from the effective date of the merger or acquisition. Intangible assets other than goodwill are recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed or exchanged, regardless of the Company’s intent to do so. Goodwill is the excess of the purchase price paid over the estimated fair value of the net assets of a business acquired. Other intangible assets consist of identifiable intangibles acquired or recognized in accounting for the acquisitions (trademarks, trade names, technology, customer relationships, order backlog and other intangible assets). Goodwill and intangible assets that have indefinite useful lives (i.e., trademarks and trade names) are subject to annual impairment testing. Management determines fair value using a discounted future cash flow analysis or other accepted valuation techniques. Goodwill and Other Intangible Assets – The Company performs an annual impairment test for goodwill and other intangible assets as of the first day of the fourth fiscal quarter of each year, or more frequently, if an event occurs or circumstances change that would more likely than not reduce fair value below carrying value. We may elect to perform a qualitative assessment that considers economic, industry and company-specific factors for all or selected reporting units. If, after completing this assessment, it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying value, we proceed to a quantitative test. We may also elect to perform a quantitative test instead of a qualitative assessment for any or all of our reporting units. In this application, the definition of “more-likely-than-not” is interpreted as a likelihood of more than 50%. For the quantitative test, management determines the estimated fair value through the use of a discounted cash flow valuation model incorporating discount rates commensurate with the risks involved for each reporting unit. If the calculated estimated fair value is less than the current carrying value, impairment of goodwill of the reporting unit may exist. The key assumptions used in the discounted cash flow valuation model for impairment testing includes discount rates, revenue growth rates and EBITDA margins, cash flow projections and terminal value rates. Discount rates are set by using the weighted average cost of capital (“WACC”) methodology. U.S. GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. Our reporting units have been identified at the operating unit level, which is one level below our operating segments. Substantially all goodwill was determined and recognized for each reporting unit pursuant to the accounting for the merger or acquisition as of the date of each transaction. With respect to acquisitions integrated into an existing reporting unit, any acquired goodwill is combined with the goodwill of the reporting unit. The impairment test for indefinite lived intangible assets consists of a comparison between their fair values and carrying values. If the carrying amounts of intangible assets that have indefinite useful lives exceed their fair values, an impairment loss will be recognized in an amount equal to the sum of any such excesses. The Company had 49 reporting units with goodwill and 46 reporting units with indefinite-lived intangible assets as of the first day of the fourth quarter of fiscal 2023, the date of the annual impairment test. Based on its initial qualitative assessment over each of the reporting units, the Company identified five reporting units to test for impairment using a quantitative test for both goodwill and indefinite-lived intangible assets. The five reporting units selected for quantitative testing have higher commercial aerospace content and, as a result, have been more adversely impacted by the COVID-19 pandemic or was a recent acquisition. The estimated fair values of each of these reporting units and other indefinite-lived intangible assets were in excess of their respective carrying values. We believe we incorporate conservative sensitivity ranges on certain company-specific projected data, including earnings before taxes and net sales, which are significant assumptions in the discounted cash flow valuation model to determine estimated fair value, such that actual results would need to be materially out of the range of the expected assumptions in order for an impairment to occur. As a result of the impairment testing performed as of the first day of the fourth quarter, no indefinite-lived intangible assets or goodwill was determined to be impaired. As economic and market conditions have not changed significantly since the first day of the fourth quarter, this conclusion remains appropriate as of September 30, 2023. The Company assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the carrying value can be recovered through projected, undiscounted cash flows from future operations over their remaining lives. Amortization of amortizable intangible assets is computed using the straight-line method over the following general estimated useful lives: technology from 20 to 22 years, order backlog from 1 to 1.5 years, customer relationships over 20 years and other intangible assets over 20 years. No indicators of impairment on the amortizable intangible assets were identified in fiscal 2023, 2022 or 2021. Stock-Based Compensation – The Company records stock-based compensation expense using the Black-Scholes pricing model based on certain valuation assumptions. Compensation expense is recorded over the vesting periods of the stock options, adjusted for expected forfeitures. The Company has classified stock-based compensation primarily within selling and administrative expenses to correspond with the classification of employees that receive stock option grants. The Company also evaluates any subsequent changes to the respective option holders terms under the modification rules of ASC 718. If determined to be a modification, the Black-Scholes pricing model is updated as of the date of the modification resulting in a cumulative catch up to expense, if necessary. Refer to Note 18, “Stock-Based Compensation,” for further information. Income Taxes – The provision for income taxes is calculated using the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for the tax effect of temporary differences between the financial statement carrying amount of assets and liabilities and the amounts used for income tax purposes and for certain changes in valuation allowances. Valuation allowances are recorded to reduce certain deferred tax assets when, in our estimation, it is more likely than not that a tax benefit will not be realized. We recognize uncertain tax positions when we have determined it is more likely than not that a tax position will be sustained upon examination. However, new information may become available, or applicable laws or regulations may change, thereby resulting in a favorable or unfavorable adjustment to amounts recorded. Refer to Note 14, “Income Taxes,” for further information. Comprehensive Income (Loss) – The term “comprehensive income (loss)” represents the change in stockholders’ equity (deficit) from transactions and other events and circumstances resulting from non-stockholder sources. The Company’s accumulated other comprehensive income or loss, consisting principally of fair value adjustments to its interest rate swap, cap and collar agreements (net of tax), cumulative foreign currency translation adjustments and pension liability adjustments (net of tax), is reported separately in the accompanying consolidated statements of comprehensive income. Foreign Currency Translation and Transactions – The assets and liabilities of subsidiaries located outside the United States are translated into U.S. dollars at the rates of exchange in effect at the balance sheet dates. Revenue and expense items are translated at the average monthly exchange rates prevailing during the period. Gains and losses resulting from foreign currency transactions are recognized currently in income and those resulting from translation of financial statements, including gains and losses from certain intercompany transactions, are accumulated as a separate component of other comprehensive income (loss) for the period. Foreign currency losses or (gains) recognized in cost of sales on the consolidated statements of income from changes in exchange rates were $14 million, $(40) million and $11 million for the fiscal years ended September 30, 2023, 2022 and 2021, respectively. Earnings per Share – Earnings per share information is determined using the two-class method, which includes the weighted-average number of common shares outstanding during the period and other securities that participate in cash dividends (“participating securities”). Our vested stock options are considered “participating securities” because they include non-forfeitable rights to cash dividends. In applying the two-class method, earnings are allocated to both common shares and participating securities based on their respective weighted-average shares outstanding for the period. Diluted earnings per share information may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated using the treasury stock method. Contingently issuable shares are not included in earnings per share until the period in which the contingency is satisfied. Refer to Note 6, “Earnings Per Share,” for further information.

REVENUE RECOGNITION

12 Months Ended

Sep. 30, 2023

Revenue Recognition [Abstract]

REVENUE RECOGNITION

TransDigm's sales are concentrated in the aerospace and defense industry. The Company’s customers include: distributors of aerospace components, commercial airlines, large commercial transport and regional and business aircraft original equipment manufacturers (“OEMs”), various armed forces of the United States (“U.S.”) and friendly foreign governments, defense OEMs, system suppliers, and various other industrial customers.

The Company recognizes revenue from contracts with customers using the five step model prescribed in ASC 606. A substantial portion of the Company's revenue is recorded at a point in time basis. Revenue is recognized from the sale of products or services when obligations under the terms of the contract are satisfied and control of promised goods or services have transferred to the customer. Control is transferred when the customer has the ability to direct the use of and obtain benefits from the goods or services. Revenue is measured at the amount of consideration the Company expects to be paid in exchange for goods or services.

In some contracts, control transfers to the customer over time, primarily in contracts where the customer is required to pay for the cost of both the finished and unfinished goods at the time of cancellation plus a reasonable profit relative to the work performed for products that were customized for the customer. Therefore, we recognize revenue over time for those agreements that have a right to margin and where the products being produced have no alternative use.

Based on our production cycle, it is generally expected that goods related to the revenue will be shipped and billed within 12 months. For revenue recognized over time, we estimate the amount of revenue attributable to a contract earned at a given point during the production cycle based on certain costs, such as materials and labor incurred to date, plus the expected profit, which is a cost-to-cost input method.

We consider the contractual consideration payable by the customer and assess variable consideration that may affect the total transaction price. Variable consideration is included in the estimated transaction price when there is a basis to reasonably estimate the amount, including whether the estimate should be constrained in order to avoid a significant reversal of revenue in a future period. These estimates are based on historical experience, anticipated performance under the terms of the contract and our best judgment at the time.

When contracts are modified to account for changes in contract specifications and requirements, the Company considers whether the modification either creates new or changes the existing enforceable rights and obligations. Contract modifications that are for goods or services that are not distinct from the existing contract, due to the significant integration with the original good or service provided, are accounted for as if they were part of that existing contract. The effect of a contract modification to an existing contract on the transaction price and our measure of progress for the performance obligation to which it relates, is recognized as an adjustment to revenue on a cumulative catch-up basis. When the modifications include additional performance obligations that are distinct and at relative stand-alone selling price, they are accounted for as a new contract and performance obligation, which are recognized prospectively.

The Company’s payment terms vary by the type and location of the customer and the products or services offered. The Company does not offer any payment terms that would meet the requirements for consideration as a significant financing component.

Shipping and handling fees and costs incurred in connection with products sold are recorded in cost of sales in the consolidated statements of income, and are not considered a performance obligation to our customers.

The Company pays sales commissions that relate to contracts for products or services that are satisfied at a point in time or over a period of one year or less and are expensed as incurred. These costs are reported as a component of selling and administrative expenses in the consolidated statements of income.

In fiscal 2023, 2022 and 2021, no customer individually accounted for 10% or more of the Company’s net sales.

Net sales to foreign customers, primarily in Western Europe, Canada and Asia, were $2.3 billion, $1.9 billion and $1.7 billion during the fiscal years ended September 30, 2023, 2022 and 2021, respectively.

Contract Assets and Liabilities – Contract assets reflect revenue recognized and performance obligations satisfied in advance of customer billing or reimbursable costs related to a specific contract. Contract liabilities (Deferred revenue) relate to payments received in advance of the satisfaction of performance under the contract. We receive payments from customers based on the terms established in our contracts. The following table summarizes our contract assets and liabilities balances (in millions):


	September 30, 2023		September 30, 2022
Contract assets, current (1)	$	191	$	119
Contract assets, non-current (2)	1		1
Total contract assets	192		120
Contract liabilities, current (3)	79		45
Contract liabilities, non-current (4)	8		9
Total contract liabilities	87		54
Net contract assets	$	105	$	66

(1)Included in prepaid expenses and other on the consolidated balance sheets.

(2)Included in other non-current assets on the consolidated balance sheets.

(3)Included in accrued and other current liabilities on the consolidated balance sheets.

(4)Included in other non-current liabilities on the consolidated balance sheets.

The increase in the Company's total contract assets at September 30, 2023 compared to September 30, 2022 is primarily due to the Calspan acquisition and also the timing and status of work in process and/or milestones of certain contracts. The increase in the Company's total contract liabilities at September 30, 2023 compared to September 30, 2022 is primarily due to the Calspan acquisition and also receipt of advance payments. For the fiscal year ended September 30, 2023, the revenue recognized that was previously included in contract liabilities was approximately $63 million.

Refer to Note 17, “Segments,” for disclosures related to the disaggregation of revenue.

- Definition

The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 9
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-9

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-10

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 15
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-15

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Paragraph 12
-Subparagraph (b)
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Section 50
-Paragraph 12
-Subparagraph (c)
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
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-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (d)
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-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479806/606-10-50-12

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)(2)
-Publisher FASB
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Reference 10: http://www.xbrl.org/2003/role/disclosureRef
-Name Accounting Standards Codification
-Topic 606
-Publisher FASB
-URI https://asc.fasb.org//606/tableOfContent

+ Details

SEGMENTS (Details) - USD ($) $ in Millions	12 Months Ended
SEGMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 6,585	$ 5,429	$ 4,798
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	4,265	3,496	3,096
Non-US
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 2,320	$ 1,933	$ 1,702

- Definition

+ References

+ Details

INTANGIBLE ASSETS - Schedule of Aggregate Amortization Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 139	$ 136	$ 137

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
CURRENT ASSETS:
Cash and cash equivalents	$ 3,472	$ 3,001
Trade accounts receivable—Net	1,230	967
Inventories—Net	1,616	1,332
Prepaid expenses and other	420	349
Total current assets	6,738	5,649
PROPERTY, PLANT AND EQUIPMENT—NET	1,255	807
GOODWILL	8,988	8,641
OTHER INTANGIBLE ASSETS—NET	2,747	2,750
OTHER NON-CURRENT ASSETS	242	260
TOTAL ASSETS	19,970	18,107
CURRENT LIABILITIES:
Current portion of long-term debt	71	76
Short-term borrowings—trade receivable securitization facility	349	350
Accounts payable	305	279
Accrued and other current liabilities	854	721
Total current liabilities	1,579	1,426
LONG-TERM DEBT	19,330	19,369
DEFERRED INCOME TAXES	627	596
OTHER NON-CURRENT LIABILITIES	412	482
Total liabilities	21,948	21,873
TD GROUP STOCKHOLDERS’ DEFICIT:
Common stock - $.01 par value; authorized 224,400,000 shares; issued 60,995,513 and 60,049,685 at September 30, 2023 and September 30, 2022, respectively	1	1
Additional paid-in capital	2,440	2,113
Accumulated deficit	(2,621)	(3,914)
Accumulated other comprehensive loss	(98)	(267)
Treasury stock, at cost; 5,688,639 shares at September 30, 2023 and September 30, 2022, respectively	(1,706)	(1,706)
Total TD Group stockholders’ deficit	(1,984)	(3,773)
NONCONTROLLING INTERESTS	6	7
Total stockholders’ deficit	(1,978)	(3,766)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	$ 19,970	$ 18,107

ACCUMULATED OTHER COMPREHENSIVE LOSS

12 Months Ended

Sep. 30, 2023

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE LOSS

The following table presents the total changes by component in accumulated other comprehensive loss (“AOCI”), net of taxes, for the fiscal years ended September 30, 2023, 2022 and 2021 (in millions):


	Unrealized gains (losses) on derivatives (1)		Pension and post-retirement benefit plans adjustment (2)		Foreign currency translation adjustment (3)		Total
Balance at September 30, 2021	$	(229)	$	(18)	$	(1)	$	(248)


Net current-period other comprehensive income (loss) (4)	352		8		(379)		(19)
Balance at September 30, 2022	123		(10)		(380)		(267)


Net current-period other comprehensive income (4)	20		12		137		169
Balance at September 30, 2023	$	143	$	2	$	(243)	$	(98)

(1)Represents unrealized gains (losses) on derivatives designated and qualifying as cash flow hedges, net of taxes, of $6 million, $112 million and $(23) million for the fiscal years ended September 30, 2023, 2022 and 2021, respectively.

(2)For the fiscal year ended September 30, 2022, pension liability adjustments, net of taxes, of $1 million represents unrecognized actuarial losses reclassified to other (income) expense upon the settlement of the ERP. Refer to Note 13, “Retirement Benefits,” for additional information. There were no material pension liability adjustments, net of taxes, related to activity for the defined pension plans and postretirement benefit plans for the fiscal years ended September 30, 2023 and 2021.

(3)Represents gains (losses) resulting from foreign currency translation of financial statements, including gains (losses) from certain intercompany transactions, into U.S. dollars at the rates of exchange in effect at the balance sheet dates. Refer to Note 3, “Summary of Significant Accounting Policies,” for additional information.

(4)Presented net of reclassifications out of AOCI into earnings, specifically net sales and interest expense-net, for realized (losses) gains on derivatives designated and qualifying as cash flow hedges of ($3) million (net of taxes of ($1) million) and $71 million (net of taxes of $22 million), respectively, for the fiscal year ended September 30, 2023 and ($6) million (net of taxes of ($2) million) and $(68) million (net of taxes of $(21) million) for the fiscal year ended September 30, 2022, respectively.

Insider Trading Arrangements	3 Months Ended
Insider Trading Arrangements	Sep. 30, 2023
Trading Arrangements, by Individual
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false

LEASES - Maturities of Lease Liabilities Operating and Financing (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Lessee, Operating Lease, Liability, Payments, Due Next Twelve Months	$ 20
Lessee, Operating Lease, Liability, Payments, Due Year Two	18
Lessee, Operating Lease, Liability, Payments, Due Year Three	13
Lessee, Operating Lease, Liability, Payments, Due Year Four	10
Lessee, Operating Lease, Liability, Payments, Due Year Five	6
Lessee, Operating Lease, Liability, Payments, Due after Year Five	13
Lessee, Operating Lease, Liability, Payments, Due	80
Lessee, Operating Lease, Liability, Undiscounted Excess Amount	13
Operating Lease, Liability	67	$ 89
Finance Lease, Liability, Payments, Due Next Twelve Months	16
Finance Lease, Liability, Payments, Due Year Two	17
Finance Lease, Liability, Payments, Due Year Three	17
Finance Lease, Liability, Payments, Due Year Four	17
Finance Lease, Liability, Payments, Due Year Five	17
Finance Lease, Liability, Payments, Due after Year Five	295
Finance Lease, Liability, Payment, Due	379
Finance Lease, Liability, Undiscounted Excess Amount	186
Finance Lease, Liability	$ 193	$ 146

INTANGIBLE ASSETS - Schedule of Finite-Lived Assets, Future Amortization (Details) $ in Millions	Sep. 30, 2023 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months	$ 138
Finite-Lived Intangible Assets, Amortization Expense, Year Two	138
Finite-Lived Intangible Assets, Amortization Expense, Year Three	135
Finite-Lived Intangible Assets, Amortization Expense, Year Four	134
Finite-Lived Intangible Assets, Amortization Expense, Year Five	$ 134

LEASES - Weighted-Average Term and Discount Rate Remaining (Details)	Sep. 30, 2023
Leases [Abstract]
Operating Lease, Weighted Average Remaining Lease Term	5 years 6 months
Finance Lease, Weighted Average Remaining Lease Term	20 years
Operating Lease, Weighted Average Discount Rate, Percent	6.10%
Finance Lease, Weighted Average Discount Rate, Percent	7.00%

SEGMENTS - Net Sales by Reportable Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Revenues	$ 6,585	$ 5,429	$ 4,798
Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	3,316	2,873	2,550
Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	3,094	2,391	2,083
Operating Segments \| Non-aviation
Segment Reporting Information [Line Items]
Revenues	175	165	165
Commercial OEM [Member] \| Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	690	603	524
Commercial OEM [Member] \| Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	961	715	582
Commercial Aftermarket [Member] \| Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	1,057	847	573
Commercial Aftermarket [Member] \| Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	1,140	785	553
Defense [Member] \| Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Revenues	1,569	1,423	1,453
Defense [Member] \| Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Revenues	$ 993	$ 891	$ 948

- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

+ Details

CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' DEFICIT - USD ($) $ in Millions	Total	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Treasury Stock	Accumulated Other Comprehensive Loss	Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NONCONTROLLING INTERESTS							$ 4
Total stockholders’ deficit	$ (3,968)
Beginning balance (in shares) at Sep. 30, 2021		59,403,100
Treasury stock, beginning balance (in shares) at Sep. 30, 2020					(4,198,226)
Beginning balance at Sep. 30, 2020		$ 1	$ 1,581	$ (4,359)	$ (794)	$ (401)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Changes in noncontrolling interest of consolidated subsidiaries, net	2						2
Accrued unvested dividend equivalents and other	(26)			(26)
Compensation expense recognized for employee stock options	121		121
Exercise of employee stock options (in shares)		791,072
Exercise of employee stock options	128		128
Net Income (Loss) Attributable to Parent	680			680
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	90
Foreign currency translation adjustment						90
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	73
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), before Reclassification, after Tax	73					73
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	10
Pension and post-retirement benefit plans adjustment, net of tax						(10)
Ending balance (in shares) at Sep. 30, 2020		58,612,028
Treasury stock, ending balance (in shares) at Sep. 30, 2021					(4,198,226)
Ending balance at Sep. 30, 2021		$ 1	1,830	(3,705)	$ (794)	(248)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NONCONTROLLING INTERESTS							6
Total stockholders’ deficit	$ (2,910)
Beginning balance (in shares) at Sep. 30, 2022	60,049,685	60,049,685
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Changes in noncontrolling interest of consolidated subsidiaries, net	$ 1						1
Special dividends and vested dividend equivalents declared	(1,045)			(1,045)
Accrued unvested dividend equivalents and other	(30)			(30)
Compensation expense recognized for employee stock options	151		151
Exercise of employee stock options (in shares)		646,585
Exercise of employee stock options	132		132
Stock repurchases under repurchase program (in shares)					(1,490,413)
Stock repurchases under repurchase program	(912)				$ (912)
Net Income (Loss) Attributable to Parent	866			866
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	(379)
Foreign currency translation adjustment						(379)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	352
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	$ (8)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax						352
Pension and post-retirement benefit plans adjustment, net of tax						8
Ending balance (in shares) at Sep. 30, 2021		59,403,100
Treasury stock, ending balance (in shares) at Sep. 30, 2022	(5,688,639)				(5,688,639)
Ending balance at Sep. 30, 2022	$ (3,773)	$ 1	2,113	(3,914)	$ (1,706)	(267)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NONCONTROLLING INTERESTS	7						7
Total stockholders’ deficit	$ (3,766)
Beginning balance (in shares) at Sep. 30, 2023	60,995,513	60,995,513
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Changes in noncontrolling interest of consolidated subsidiaries, net	$ (1)						(1)
Accrued unvested dividend equivalents and other	(5)			(5)
Compensation expense recognized for employee stock options	112		112
Exercise of employee stock options (in shares)		945,828
Exercise of employee stock options	215		215
Stock repurchases under repurchase program (in shares)					(1,490,413)
Net Income (Loss) Attributable to Parent	1,298			1,298
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	137
Foreign currency translation adjustment						137
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	20
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	$ (12)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax						20
Pension and post-retirement benefit plans adjustment, net of tax						12
Ending balance (in shares) at Sep. 30, 2022	60,049,685	60,049,685
Treasury stock, ending balance (in shares) at Sep. 30, 2023	(5,688,639)				(5,688,639)
Ending balance at Sep. 30, 2023	$ (1,984)	$ 1	$ 2,440	$ (2,621)	$ (1,706)	$ (98)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
NONCONTROLLING INTERESTS	6						$ 6
Total stockholders’ deficit	$ (1,978)

SEGMENTS - EBITDA Defined by Segment to Consolidated Income Before Taxes Operations (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	$ 3,395	$ 2,646	$ 2,189
Depreciation and amortization expense	268	253	253
Interest expense-net	(1,164)	(1,076)	(1,059)
Non-cash stock and deferred compensation expense	135	153	129
Refinancing costs	56	1	37
Gain (Loss) on Disposition of Business	0	7	69
Income from continuing operations before income taxes	1,716	1,127	715
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	3,484	2,717	2,259
Operating Segments \| Power & Control
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	1,866	1,531	1,319
Depreciation and amortization expense	110	109	107
Operating Segments \| Airframe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	1,547	1,121	878
Depreciation and amortization expense	152	138	139
Operating Segments \| Non-aviation
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	71	65	62
Depreciation and amortization expense	5	5	6
Corporate, Non-Segment [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	89	71	70
Depreciation and amortization expense	1	1	1
Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization expense	268	253	253
Interest expense-net	1,164	1,076	1,059
Acquisition and divestiture transaction-related expenses	18	18	35
Non-cash stock and deferred compensation expense	157	184	130
Refinancing costs	56	1	37
COVID-19 pandemic restructuring costs	0	0	40
Other, net	$ 16	$ (6)	$ (11)

INCOME TAXES - Income Tax Provision on Income Before Income Taxes (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Current
Federal	$ 276	$ 194	$ (21)
State	41	27	14
Foreign	97	62	7
Total Current	414	283	0
Deferred Federal Income Tax Expense (Benefit)	28	(17)	7
Deferred State and Local Income Tax Expense (Benefit)	11	(8)	(2)
Deferred Foreign Income Tax Expense (Benefit)	(36)	3	29
Deferred	3	(22)	34
INCOME TAX PROVISION	$ 417	$ 261	$ 34

INVENTORIES

12 Months Ended

Sep. 30, 2023

Inventory Disclosure [Abstract]

INVENTORIES

Inventories consist of the following (in millions):


	September 30, 2023		September 30, 2022
Raw materials and purchased component parts	$	1,144	$	959
Work-in-progress	455		359
Finished goods	226		210
Total	1,825		1,528
Reserves for excess and obsolete inventory	(209)		(196)
Inventories—Net	$	1,616	$	1,332

VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Sep. 30, 2023

SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

TRANSDIGM GROUP INCORPORATED

VALUATION AND QUALIFYING ACCOUNTS

FOR THE FISCAL YEARS ENDED SEPTEMBER 30, 2023, 2022, AND 2021

(Amounts in millions)


Column A	Column B		Column C				Column D		Column E
	Balance at Beginning of Period		Additions				Divestitures & Deductions from Reserve (1)		Balance at End of Period
Description			Charged to Costs and Expenses		Acquisitions & Purchase Price Adjustments
Year Ended September 30, 2023
Allowance for uncollectible accounts	$	35	$	4	$	—	$	(8)	$	31
Inventory valuation reserves	196		20		—		(7)		209
Valuation allowance for deferred tax assets	137		90		—		—		227
Year Ended September 30, 2022
Allowance for uncollectible accounts	$	30	$	9	$	—	$	(4)	$	35
Inventory valuation reserves	194		21		3		(22)		196
Valuation allowance for deferred tax assets	74		62		1		—		137
Year Ended September 30, 2021
Allowance for uncollectible accounts	$	37	$	—	$	—	$	(7)	$	30
Inventory valuation reserves	178		42		10		(36)		194
Valuation allowance for deferred tax assets	132		(58)		—		—		74

(1)The amounts in this column represent the impact from divestitures, charge-offs net of recoveries and the impact of foreign currency translation adjustments.

INTANGIBLE ASSETS - Summary of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 8,641	$ 8,568
Goodwill, Acquired During Period	256	259
Purchase price allocation adjustments (1)	7	3
Currency translation adjustments and other	84	(189)
Purchase price allocation adjustments (2)	7	3
Goodwill, Ending Balance	8,988	8,641
Power & Control
Goodwill [Line Items]
Goodwill, Beginning Balance	4,155	4,149
Goodwill, Acquired During Period	12	57
Purchase price allocation adjustments (1)	4	0
Currency translation adjustments and other	23	(51)
Purchase price allocation adjustments (2)	4	0
Goodwill, Ending Balance	4,194	4,155
Airframe
Goodwill [Line Items]
Goodwill, Beginning Balance	4,393	4,326
Goodwill, Acquired During Period	244	202
Purchase price allocation adjustments (1)	3	3
Currency translation adjustments and other	61	(138)
Purchase price allocation adjustments (2)	3	3
Goodwill, Ending Balance	4,701	4,393
Non-aviation
Goodwill [Line Items]
Goodwill, Beginning Balance	93	93
Goodwill, Acquired During Period	0	0
Purchase price allocation adjustments (1)	0	0
Currency translation adjustments and other	0	0
Purchase price allocation adjustments (2)	0	0
Goodwill, Ending Balance	$ 93	$ 93

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References + Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2023
Accounting Policies [Abstract]
Basis of Presentation and Consolidation	Basis of Presentation and Consolidation – The accompanying consolidated financial statements were prepared in conformity with U.S. GAAP and include the accounts of TD Group and subsidiaries. All significant intercompany balances and transactions have been eliminated.
Reclassification, Comparability Adjustment	Certain reclassifications to the consolidated financial statements and notes have been made to the prior year amounts to conform to the current year presentation, none of which are material.
Estimates	Estimates – The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.
Revenue Recognition	Revenue Recognition – The Company recognizes revenue from contracts with customers using the five step model prescribed in ASC 606. A substantial portion of the Company's revenue is recorded at a point in time basis. Revenue is recognized from the sale of products or services when obligations under the terms of the contract are satisfied and control of promised goods or services have transferred to the customer. Control is transferred when the customer has the ability to direct the use of and obtain benefits from the goods or services. Revenue is measured at the amount of consideration the Company expects to be paid in exchange for goods or services. Refer to Note 5, “Revenue Recognition,” for further details.
Shipping and Handling Costs	Shipping and Handling Costs – Shipping and handling costs are included in cost of sales in the consolidated statements of income.
Research and Development Expense	Research and Development Costs – The Company expenses research and development costs as incurred and classifies such amounts in selling and administrative expenses. The expense recognized for research and development costs for the fiscal years ended September 30, 2023, 2022 and 2021 was approximately $105 million, $95 million, and $106 million, respectively.
Cash and Cash Equivalents, Policy	Cash Equivalents – The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Cash equivalents are recorded at cost, which approximates fair value.
Receivables, Trade and Other Accounts Receivable, Allowance for Doubtful Accounts, Policy	Allowance for Credit Losses – The Company's allowance for credit losses is the allowance for uncollectible accounts. The allowance for uncollectible accounts reduces the trade accounts receivable balance to the estimated net realizable value equal to the amount that is expected to be collected. The Company’s method for developing its allowance for credit losses is based on historical write-off experience, the aging of receivables, an assessment of the creditworthiness of customers, economic conditions and other external market information. The allowance also incorporates a provision for the estimated impact of disputes with customers. All provisions for allowances for uncollectible accounts are included in selling and administrative expenses. The determination of the amount of the allowance for uncollectible accounts is subject to judgment and estimation by management. If circumstances change or economic conditions deteriorate or improve, the allowance for uncollectible accounts could increase or decrease. Refer to Note 7, “Trade Accounts Receivable,” for further details.
Inventories	Inventories – Inventories are stated at the lower of cost or net realizable value. Cost of inventories is generally determined by the average cost and the first-in, first-out (“FIFO”) methods and includes material, labor and overhead related to the manufacturing process. Provision for potentially obsolete or slow-moving inventory is made based on management’s analysis of inventory levels and future sales forecasts. Refer to Note 8, “Inventories,” for further details.
Property, Plant and Equipment	Property, Plant and Equipment – Property, plant and equipment are stated at cost and include improvements which significantly increase capacities or extend the useful lives of existing plant and equipment. Depreciation is computed using the straight-line method over the following general estimated useful lives: land improvements from 10 to 20 years, buildings and improvements from 5 to 30 years, machinery and equipment from 2 to 10 years and furniture and fixtures from 3 to 10 years. Certain exceptions do apply in which an asset will have an estimated useful life outside of the range listed above dependent on, among other things, the nature and condition of the asset. Net gains or losses related to asset dispositions are recognized in earnings in the period in which dispositions occur. Routine maintenance, repairs and replacements are expensed as incurred. Amortization expense of assets accounted for as finance leases is included within depreciation expense. Property, plant and equipment is assessed for potential impairment whenever indicators of impairment are present by determining whether the carrying value of the property can be recovered through projected, undiscounted cash flows from future operations over the property’s remaining estimated useful life. Any impairment recognized is the amount by which the carrying amount exceeds the fair value of the asset. Fair value is measured based on quoted market prices in active markets, if available. If quoted market prices are not available, the estimate of fair value is based on various valuation techniques, including the discounted value of estimated future cash flows. No material impairments of long-lived assets were recorded in fiscal 2023, 2022 or 2021. Refer to Note 9, “Property, Plant and Equipment,” for further details.
Debt Issue Costs, Premiums and Discounts	Debt Issuance Costs, Premiums and Discounts – The cost of obtaining financing as well as premiums and discounts are amortized using the effective interest method over the terms of the respective obligations as a component of interest expense within the consolidated statements of income. Debt issuance costs are presented in the consolidated balance sheets as a direct reduction from the carrying amount of the related debt obligations. Refer to Note 12, “Debt,” for further details.
Financial Instruments	Financial Instruments – Interest rate swap, cap and collar agreements are used to manage interest rate risk associated with floating rate borrowings under our Credit Agreement. These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the term of the agreements without an exchange of the underlying principal amount. The agreements utilized by the Company effectively modify the Company’s exposure to interest rate risk by converting a portion of the Company’s floating rate debt to a fixed rate basis from the effective date through the maturity date of the respective interest rate swap, cap and collar agreements, thereby reducing the impact of interest rate movements on future interest expense. These derivative instruments qualify as effective cash flow hedges under U.S. GAAP. The Company transacts business in various foreign currencies, which subjects the Company’s cash flows and results of operations to exposure related to changes in foreign currency exchange rates. These exposures arise primarily from purchases or sales of products and services from third parties. Foreign currency forward exchange contracts provide for the purchase or sale of foreign currencies at specified future dates at specified exchange rates, and are used to offset changes in the fair value of certain assets or liabilities or forecasted cash flows resulting from transactions denominated in foreign currencies. For the interest rate swap, cap and collar agreements and the foreign currency forward contracts designated as cash flow hedges, the effective portion of the gain or loss from the financial instruments is reported as a component of accumulated other comprehensive loss in stockholders’ deficit and subsequently reclassified into earnings in the same line as the hedged item in the same period or periods during which the hedged item affected earnings. As the interest rate swap, cap and collar agreements are used to manage interest rate risk, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in interest expense-net in the consolidated statements of income. As the foreign currency forward exchange contracts are used to manage foreign currency exposure primarily arising from sales to third parties, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in net sales in the consolidated statements of income. The cash flows from settled contracts are recognized in net cash provided by operating activities in the consolidated statements of cash flows. Refer to Note 21, “Derivatives and Hedging Activities,” for further details.
Business Combinations	Business Combinations – In accordance with ASC 805, “Business Combinations,” the Company uses the acquisition method of accounting to allocate costs of acquired businesses to the assets acquired and liabilities assumed based on their estimated fair values at the dates of acquisition. The excess costs of acquired businesses over the fair values of the assets acquired and liabilities assumed were recognized as goodwill. The valuations of the acquired assets and liabilities assumed will impact the determination of future operating results. Determining the fair value of assets acquired and liabilities assumed requires management’s judgment and often involves the use of significant estimates and assumptions, including assumptions with respect to future cash inflows and outflows, revenue growth rates and EBITDA margins, discount rates, customer attrition rates, royalty rates, asset lives and market multiples, among other items. These assumptions were forward looking and could be affected by future economic and market conditions. We determine the fair values of intangible assets acquired generally in consultation with third-party valuation advisors. Fair value adjustments to the Company’s assets and liabilities are recognized and the results of operations of the acquired business are included in our consolidated financial statements from the effective date of the merger or acquisition. Intangible assets other than goodwill are recognized if the benefit of the intangible asset is obtained through contractual or other legal rights, or if the intangible asset can be sold, transferred, licensed or exchanged, regardless of the Company’s intent to do so.Goodwill is the excess of the purchase price paid over the estimated fair value of the net assets of a business acquired. Other intangible assets consist of identifiable intangibles acquired or recognized in accounting for the acquisitions (trademarks, trade names, technology, customer relationships, order backlog and other intangible assets). Goodwill and intangible assets that have indefinite useful lives (i.e., trademarks and trade names) are subject to annual impairment testing. Management determines fair value using a discounted future cash flow analysis or other accepted valuation techniques.
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets – The Company performs an annual impairment test for goodwill and other intangible assets as of the first day of the fourth fiscal quarter of each year, or more frequently, if an event occurs or circumstances change that would more likely than not reduce fair value below carrying value. We may elect to perform a qualitative assessment that considers economic, industry and company-specific factors for all or selected reporting units. If, after completing this assessment, it is determined that it is more likely than not that the fair value of a reporting unit is less than its carrying value, we proceed to a quantitative test. We may also elect to perform a quantitative test instead of a qualitative assessment for any or all of our reporting units. In this application, the definition of “more-likely-than-not” is interpreted as a likelihood of more than 50%. For the quantitative test, management determines the estimated fair value through the use of a discounted cash flow valuation model incorporating discount rates commensurate with the risks involved for each reporting unit. If the calculated estimated fair value is less than the current carrying value, impairment of goodwill of the reporting unit may exist. The key assumptions used in the discounted cash flow valuation model for impairment testing includes discount rates, revenue growth rates and EBITDA margins, cash flow projections and terminal value rates. Discount rates are set by using the weighted average cost of capital (“WACC”) methodology. U.S. GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. Our reporting units have been identified at the operating unit level, which is one level below our operating segments. Substantially all goodwill was determined and recognized for each reporting unit pursuant to the accounting for the merger or acquisition as of the date of each transaction. With respect to acquisitions integrated into an existing reporting unit, any acquired goodwill is combined with the goodwill of the reporting unit. The impairment test for indefinite lived intangible assets consists of a comparison between their fair values and carrying values. If the carrying amounts of intangible assets that have indefinite useful lives exceed their fair values, an impairment loss will be recognized in an amount equal to the sum of any such excesses. The Company had 49 reporting units with goodwill and 46 reporting units with indefinite-lived intangible assets as of the first day of the fourth quarter of fiscal 2023, the date of the annual impairment test. Based on its initial qualitative assessment over each of the reporting units, the Company identified five reporting units to test for impairment using a quantitative test for both goodwill and indefinite-lived intangible assets. The five reporting units selected for quantitative testing have higher commercial aerospace content and, as a result, have been more adversely impacted by the COVID-19 pandemic or was a recent acquisition. The estimated fair values of each of these reporting units and other indefinite-lived intangible assets were in excess of their respective carrying values. We believe we incorporate conservative sensitivity ranges on certain company-specific projected data, including earnings before taxes and net sales, which are significant assumptions in the discounted cash flow valuation model to determine estimated fair value, such that actual results would need to be materially out of the range of the expected assumptions in order for an impairment to occur. As a result of the impairment testing performed as of the first day of the fourth quarter, no indefinite-lived intangible assets or goodwill was determined to be impaired. As economic and market conditions have not changed significantly since the first day of the fourth quarter, this conclusion remains appropriate as of September 30, 2023. The Company assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the carrying value can be recovered through projected, undiscounted cash flows from future operations over their remaining lives. Amortization of amortizable intangible assets is computed using the straight-line method over the following general estimated useful lives: technology from 20 to 22 years, order backlog from 1 to 1.5 years, customer relationships over 20 years and other intangible assets over 20 years. No indicators of impairment on the amortizable intangible assets were identified in fiscal 2023, 2022 or 2021.
Stock-Based Compensation	Stock-Based Compensation – The Company records stock-based compensation expense using the Black-Scholes pricing model based on certain valuation assumptions. Compensation expense is recorded over the vesting periods of the stock options, adjusted for expected forfeitures. The Company has classified stock-based compensation primarily within selling and administrative expenses to correspond with the classification of employees that receive stock option grants. The Company also evaluates any subsequent changes to the respective option holders terms under the modification rules of ASC 718. If determined to be a modification, the Black-Scholes pricing model is updated as of the date of the modification resulting in a cumulative catch up to expense, if necessary. Refer to Note 18, “Stock-Based Compensation,” for further information.
Income Taxes	Income Taxes – The provision for income taxes is calculated using the asset and liability method. Under the asset and liability method, deferred income taxes are recognized for the tax effect of temporary differences between the financial statement carrying amount of assets and liabilities and the amounts used for income tax purposes and for certain changes in valuation allowances. Valuation allowances are recorded to reduce certain deferred tax assets when, in our estimation, it is more likely than not that a tax benefit will not be realized. We recognize uncertain tax positions when we have determined it is more likely than not that a tax position will be sustained upon examination. However, new information may become available, or applicable laws or regulations may change, thereby resulting in a favorable or unfavorable adjustment to amounts recorded. Refer to Note 14, “Income Taxes,” for further information.
Comprehensive Income (Loss)	Comprehensive Income (Loss) – The term “comprehensive income (loss)” represents the change in stockholders’ equity (deficit) from transactions and other events and circumstances resulting from non-stockholder sources. The Company’s accumulated other comprehensive income or loss, consisting principally of fair value adjustments to its interest rate swap, cap and collar agreements (net of tax), cumulative foreign currency translation adjustments and pension liability adjustments (net of tax), is reported separately in the accompanying consolidated statements of comprehensive income.
Foreign Currency Translations and Transactions	Foreign Currency Translation and Transactions – The assets and liabilities of subsidiaries located outside the United States are translated into U.S. dollars at the rates of exchange in effect at the balance sheet dates. Revenue and expense items are translated at the average monthly exchange rates prevailing during the period. Gains and losses resulting from foreign currency transactions are recognized currently in income and those resulting from translation of financial statements, including gains and losses from certain intercompany transactions, are accumulated as a separate component of other comprehensive income (loss) for the period. Foreign currency losses or (gains) recognized in cost of sales on the consolidated statements of income from changes in exchange rates were $14 million, $(40) million and $11 million for the fiscal years ended September 30, 2023, 2022 and 2021, respectively.
Earnings per Share (two-class method)	Earnings per Share – Earnings per share information is determined using the two-class method, which includes the weighted-average number of common shares outstanding during the period and other securities that participate in cash dividends (“participating securities”). Our vested stock options are considered “participating securities” because they include non-forfeitable rights to cash dividends. In applying the two-class method, earnings are allocated to both common shares and participating securities based on their respective weighted-average shares outstanding for the period. Diluted earnings per share information may include the additional effect of other securities, if dilutive, in which case the dilutive effect of such securities is calculated using the treasury stock method. Contingently issuable shares are not included in earnings per share until the period in which the contingency is satisfied. Refer to Note 6, “Earnings Per Share,” for further information.
RECENT ACCOUNTING PRONOUNCEMENTS	In March 2020, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2020-04, “Reference Rate Reform.” Certain amendments were provided for in ASU 2021-01, “Reference Rate Reform (ASC 848): Scope,” which was issued in January 2021, and ASU 2022-06, “Reference Rate Reform (ASC 848): Deferral of the Sunset Date.” ASU 2021-01 provides optional guidance for a limited period of time to ease potential accounting impacts associated with transitioning away from reference rates that are expected to be discontinued, such as the London Interbank Offered Rate (“LIBOR”). The amendments in this ASU apply only to contracts, hedging relationships, and other transactions that reference LIBOR or another reference rate expected to be discontinued. As a result of ASU 2022-06 deferring the sunset date, ASC 848 is effective through December 31, 2024. During the second quarter of fiscal 2023, the Company entered into LIBOR to Term Secured Overnight Financing Rate (“Term SOFR”) basis interest rate swap and cap agreements to effectively convert its existing swaps and caps from LIBOR-based to Term SOFR-based. The practical expedients permissible under ASC 848 were applied and resulted in the Company preserving the presentation of its existing swaps and caps as qualifying cash flow hedges. Refer to Note 21, “Derivatives and Hedging Activities,” for further disclosure of the hedging transactions entered into during the second quarter of fiscal 2023. The application of this standard did not have a material impact on the Company's consolidated financial statements and disclosures. In October 2021, the FASB issued ASU 2021-08, “Business Combinations (ASC 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers.” ASU 2021-08 requires that an acquirer recognize and measure contract assets and liabilities acquired in a business combination in accordance with “ASU 2014-09, Revenue from Contracts with Customers (ASC 606).” This standard is effective for annual periods beginning after December 15, 2022, including interim periods therein, with early adoption permitted. The guidance will be applied prospectively to acquisitions occurring on or after the effective date. The impact of this guidance will depend on the contract assets and liabilities acquired in future business combinations. In October 2023, the FASB issued ASU 2023-06, “Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative,” to amend certain disclosure and presentation requirements for a variety of topics within the ASC. These amendments align the requirements in the ASC to the removal of certain disclosure requirements set out in Regulation S-X and Regulation S-K, announced by the SEC. The effective date for each amended topic in the ASC is either the date on which the SEC’s removal of the related disclosure requirement from Regulation S-X or Regulation S-K becomes effective, or on June 30, 2027, if the SEC has not removed the requirements by that date. Early adoption is prohibited. The Company does not expect that the application of this standard will have an impact on our consolidated financial statements and disclosures.

DOCUMENT AND ENTITY INFORMATION - USD ($)	12 Months Ended
DOCUMENT AND ENTITY INFORMATION - USD ($)	Sep. 30, 2023	Oct. 31, 2023	Mar. 31, 2023
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Sep. 30, 2023
Current Fiscal Year End Date	--09-30
Document Transition Report	false
Entity File Number	001-32833
Entity Registrant Name	TransDigm Group Incorporated
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	41-2101738
Entity Address, Address Line One	1301 East 9th Street,
Entity Address, Address Line Two	Suite 3000,
Entity Address, City or Town	Cleveland,
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	44114
City Area Code	216
Local Phone Number	706-2960
Title of 12(b) Security	Common Stock, $0.01 par value
Trading Symbol	TDG
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction	false
Entity Shell Company	false
Entity Public Float			$ 39,444,381,187
Entity Common Stock, Shares Outstanding		55,314,104
Documents Incorporated by Reference	Certain sections of the registrant’s definitive Proxy Statement to be filed in connection with its 2024 Annual Meeting of Shareholders expected to be held on March 7, 2024 are incorporated by reference into Part III of this Annual Report on Form 10-K.
Amendment Flag	false
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	FY
Entity Central Index Key	0001260221

SEGMENTS - Capital Expenditures and Depreciation and Amortization by Segment (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Capital expenditures	$ 139	$ 119	$ 105
Depreciation and amortization expense	268	253	253
Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Capital expenditures	67	63	65
Depreciation and amortization expense	110	109	107
Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Capital expenditures	65	52	37
Depreciation and amortization expense	152	138	139
Operating Segments \| Non-aviation
Segment Reporting Information [Line Items]
Capital expenditures	6	3	2
Depreciation and amortization expense	5	5	6
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Capital expenditures	1	1	1
Depreciation and amortization expense	$ 1	$ 1	$ 1

COMMITMENTS AND CONTINGENCIES	12 Months Ended
COMMITMENTS AND CONTINGENCIES	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	COMMITMENTS AND CONTINGENCIES During the ordinary course of business, the Company is from time to time threatened with, or may become a party to, legal actions and other proceedings. While the Company is currently involved in certain legal proceedings, it believes the results of these proceedings will not have a material adverse effect on its financial condition, results of operations, or cash flows. Litigation Claims – On November 1, 2021, a purported stockholder of the Company filed a derivative complaint, captioned Sciabacucchi v Howley, et al. C.A. No. 2021-0938-LWW (the “Derivative Action”), in the Delaware Court of Chancery (the “Court”). The complaint, which named certain directors of the Company (the “Director Defendants”) as defendants, alleged that the Director Defendants awarded and received excessive compensation. The Director Defendants denied any and all allegations of wrongdoing or liability asserted in the Derivative Action. Nonetheless, solely to eliminate the uncertainty, distraction, disruption, burden, risk and expense of further litigation, the Company and the Director Defendants entered into a Stipulation and Agreement of Compromise, Settlement and Release (the “Stipulation”) with the plaintiff on August 19, 2022. Pursuant to the terms of the Stipulation, the Director Defendants agreed to implement and maintain certain changes to the Company’s compensation policies and practices such as to the extent dividend equivalent payments are declared payable to any Board of Director, those DEPs will not be paid in cash, but instead will be paid via a reduction to the strike price of options that are issued to that director. Other corporate governance enhancements were also agreed to by the Company. The Company was also responsible for the payment of plaintiff’s attorneys’ fees. The proposed settlement as set forth in the Stipulation, other than the amount of the attorneys’ fees, was approved by the Court on November 10, 2022. On July 3, 2023, the settlement amount of the attorneys' fees was approved and subsequently paid by TransDigm. The settlement (i) fully resolved the Derivative Action by dismissing all asserted claims with prejudice and (ii) released all claims related to the allegations in the Derivative Action. The settlement did not have a material adverse impact on the Company’s financial statements. DOD OIG Audit – TransDigm’s subsidiaries are periodically subject to pricing reviews and government buying agencies that purchase some of our subsidiaries’ products are periodically subject to audits by the Department of Defense (“DOD”) Office of Inspector General (“OIG”) with respect to prices paid for such products. In 2019, the DOD OIG received a congressional letter requesting a comprehensive review of TransDigm’s contracts with the DOD from January 2017 through June 2019 to identify whether TransDigm earned excess profits. This subsequently resulted in an audit by the DOD OIG in which the objective was to determine whether TransDigm’s business model impacted the DOD’s ability to pay fair and reasonable prices for spare parts. In December 2021, the OIG completed the audit and issued the related audit report. Despite the audit report making clear there was no wrongdoing by TransDigm, its businesses, or the DOD, the report recommended that TransDigm voluntarily refund at least $21 million in excess profit on 150 contracts subject to the audit. TransDigm disagrees with many of the implications contained in the report, and objects to the use of arbitrary standards and analysis which render many areas of the report inaccurate and misleading. These include: (1) The report expressly acknowledges that it used arbitrary standards that are not applicable to the audited contracts and warns that its arbitrary standards should not be used in the future. The use of inapplicable standards results in flawed analysis and is misleading; (2) The report ignores significant real costs incurred by the business and contrary to law reports these costs as excess profit; (3) Despite data demonstrating that the DOD paid lower prices compared to the commercial prices for similar parts, the report did not conduct a price analysis and instead implies that the DOD negotiated prices were too high. No loss contingency related to the voluntary refund request has been recorded as of September 30, 2023 as the Company has concluded that based on the current facts and circumstances, it's uncertain as to whether or not the requested voluntary refund will be made. Environmental Liabilities – Our operations and facilities are subject to a number of federal, state, local and foreign environmental laws and regulations that govern, among other things, discharges of pollutants into the air and water, the generation, handling, storage and disposal of hazardous materials and wastes, the remediation of contamination and the health and safety of our employees. Environmental laws and regulations may require that the Company investigate and remediate the effects of the release or disposal of materials at sites associated with past and present operations. Certain facilities and third-party sites utilized by the Company have been identified as potentially responsible parties under the federal superfund laws and comparable state laws. The Company is currently involved in the investigation and remediation of a number of sites under applicable laws. Estimates of the Company’s environmental liabilities are based on current facts, laws, regulations and technology. These estimates take into consideration the Company’s prior experience and professional judgment of the Company’s environmental advisors. Estimates of the Company’s environmental liabilities are further subject to uncertainties regarding the nature and extent of site contamination, the range of remediation alternatives available, evolving remediation standards, imprecise engineering evaluations and cost estimates, the extent of corrective actions that may be required and the number and financial condition of other potentially responsible parties, as well as the extent of their responsibility for the remediation. Accordingly, as investigation and remediation proceed, it is likely that adjustments in the Company’s accruals will be necessary to reflect new information. The amounts of any such adjustments could have a material adverse effect on the Company’s results of operations or cash flows in a given period. Based on currently available information, however, the Company does not believe that future environmental costs in excess of those accrued with respect to sites for which the Company has been identified as a potentially responsible party are likely to have a material adverse effect on the Company’s financial condition or results of operations. Environmental liabilities are recorded when the liability is probable and the costs are reasonably estimable, which generally is not later than at completion of a feasibility study or when the Company has recommended a remedy or has committed to an appropriate plan of action. The Company also takes into consideration the estimated period of time in which payments will be required. The liabilities are reviewed periodically and, as investigation and remediation proceed, adjustments are made as necessary. Liabilities for losses from environmental remediation obligations do not consider the effects of inflation and anticipated expenditures are not discounted to their present value. The liabilities are not offset by possible recoveries from insurance carriers or other third parties, but do reflect anticipated allocations among potentially responsible parties at federal superfund sites or similar state-managed sites, third party indemnity obligations, and an assessment of the likelihood that such parties will fulfill their obligations at such sites. The Company’s consolidated balance sheets includes current environmental remediation obligations at September 30, 2023 and 2022 of $3 million and $8 million classified as a component of accrued and other current liabilities, respectively, and non-current environmental remediation obligations at September 30, 2023 and 2022 of $41 million and $38 million classified as a component of other non-current liabilities, respectively. Leach International Europe (Facility Fire) – On August 8, 2019, a fire caused significant damage to the Niort, France operating facility of the Leach International Europe subsidiary, which is reported within the Company’s Power & Control segment. The facility as well as certain machinery, equipment and inventory sustained damage. The Company suspended operations at the Niort facility as a result of the fire; however, had transferred certain operations to temporary facilities until operations were fully restored at the rebuilt facility. The new facility was completed in December 2020 and was fully operational as of March 2021. The Company’s insurance covers damage to the facility, equipment, inventory, and other assets, at replacement cost, as well as business interruption losses and other incremental costs resulting from the disruption of operations caused by the fire, subject to a $1 million deductible and certain sub-limits based on the nature of the covered item. Anticipated insurance recoveries related to losses and incremental costs incurred were recognized when receipt was probable. Anticipated insurance recoveries in excess of net book value of the damaged property and inventory were recorded once all contingencies relating to the claim had been resolved. During fiscal 2021, the insurance claim, inclusive of property, business interruption and incremental costs of working, was settled for $88 million, net of a $1 million deductible. A gain of $24 million was recorded to other (income) expense during fiscal 2021, of which $19 million represents the insurance proceeds received in excess of the carrying value of the damaged fixed assets and inventory and $5 million represents the insurance proceeds received in excess of previously recorded receivables for business interruption and incremental costs of working. Of the approximately $58 million in cash proceeds received in fiscal 2021 relating to the insurance claim and final settlement of the claim, $24 million was included in net cash used in investing activities and $34 million was included in net cash provided by operating activities within the consolidated statements of cash flows based on the nature of the insurance reimbursements.

TRADE ACCOUNTS RECEIVABLE (Tables)

12 Months Ended

Sep. 30, 2023

Receivables [Abstract]

Schedule of Trade Accounts Receivable

Trade accounts receivable consist of the following (in millions):


	September 30, 2023		September 30, 2022
Trade accounts receivable—gross	$	1,261	$	1,002
Allowance for uncollectible accounts	(31)		(35)
Trade accounts receivable—Net	$	1,230	$	967

DEBT - Future Maturities of Long-Term Debt (Detail) $ in Millions	Sep. 30, 2023 USD ($)
Debt Disclosure [Abstract]
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months	$ 66
Long-term Debt, Maturities, Repayments of Principal in Year Two	66
Long-term Debt, Maturities, Repayments of Principal in Year Three	4,466
Long-term Debt, Maturities, Repayments of Principal in Year Four	2,260
Long-term Debt, Maturities, Repayments of Principal in Year Five	9,108
Long-term Debt, Maturities, Repayments of Principal after Year Five	3,404
Debt Instrument, Face Amount	$ 19,370

INTANGIBLE ASSETS - Schedule of Intangible Assets (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Gross (Excluding Goodwill)	$ 3,782	$ 3,640
Intangible Assets, Accumulated Amortization	1,035	890
Total	2,747	2,750
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,124	2,054
Accumulated Amortization	888	780
Net	1,236	1,274
Order Backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7	7
Accumulated Amortization	6	3
Net	1	4
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	623	580
Accumulated Amortization	136	104
Net	487	476
Other Intangible Assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9	9
Accumulated Amortization	5	3
Net	4	6
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill), Gross	1,019	990
Indefinite-Lived Intangible Assets, Accumulated Amortization	0	0
Intangible Assets (Excluding Goodwill), Net	$ 1,019	$ 990

INCOME TAXES - Components of Deferred Taxes (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Intangible assets	$ (852)	$ (832)
Property, plant and equipment	(82)	(23)
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Benefits	103	108
Deferred Tax Assets, Derivative Instruments	(47)	(42)
Net operating loss carryforward	66	52
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	36	41
Inventory	89	61
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	9	14
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves	10	11
Deferred Tax Assets, Tax Credit Carryforwards	25	27
Deferred Tax Assets, in Process Research and Development	52	24
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	6	6
Deferred Tax Asset, Interest Carryforward	190	87
Other	(5)	7
Total deferred tax liabilities	(400)	(459)
Add: Valuation allowance	(227)	(137)
Total net deferred tax liabilities	$ (627)	$ (596)

PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Sep. 30, 2023

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consist of the following (in millions):


	September 30, 2023		September 30, 2022
Land and improvements	$	119	$	103
Buildings and improvements	567		461
Machinery, equipment and other	1,334		945
Construction-in-progress	105		78
Total	2,125		1,587
Accumulated depreciation	(870)		(780)
Property, plant and equipment—Net	$	1,255	$	807

EARNINGS PER SHARE - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Numerator for earnings per share:
Income from continuing operations	$ 1,299	$ 866	$ 681
Less: Net income attributable to noncontrolling interests	1	1	1
Net income from continuing operations attributable to TD Group	1,298	865	680
Less: Dividends paid on participating securities	(38)	(86)	(73)
Income from discontinued operations, net of tax	0	1	0
NET INCOME APPLICABLE TO TD GROUP COMMON STOCKHOLDERS	$ 1,260	$ 780	$ 607
Denominator for basic and diluted earnings per share under the two-class method:
Weighted-average common shares outstanding - basic (in shares)	54.9	54.8	54.8
Weighted-average common shares outstanding - diluted (in shares)	54.9	54.8	54.8
Vested options deemed participating securities	2.3	3.4	3.6
Weighted-average shares outstanding - basic (in shares)	57.2	58.2	58.4
Weighted-average shares outstanding - diluted (in shares)	57.2	58.2	58.4
Earnings per share from continuing operations - basic (in usd per share)	$ 22.03	$ 13.38	$ 10.41
Earnings per share from continuing operations - diluted (in usd per share)	22.03	13.38	10.41
Earnings per share from discontinued operations - basic (in usd per share)	0	0.02	0
Earnings per share from discontinued operations - diluted (in usd per share)	0	0.02	0
Earnings per share - basic (in usd per share)	22.03	13.40	10.41
Earnings per share - diluted (in usd per share)	$ 22.03	$ 13.40	$ 10.41

STOCK-BASED COMPENSATION - Weighted Average Assumptions used to Estimate Fair Value of all Options at Grant Date using Black-Scholes-Merton Option-Pricing Model (Detail)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Share-Based Payment Arrangement [Abstract]
Risk-free interest rate, minimum	3.45%	1.47%	0.42%
Risk-free interest rate, maximum	4.20%	2.97%	0.86%
Expected life of options	6 years 6 months	6 years 6 months	5 years 6 months
Expected dividend yield of stock	0.00%	0.00%	0.00%
Expected volatility of stock	32.50%		36.00%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate, minimum	3.45%	1.47%	0.42%
Risk-free interest rate, maximum	4.20%	2.97%	0.86%
Expected life of options	6 years 6 months	6 years 6 months	5 years 6 months
Expected dividend yield of stock	0.00%	0.00%	0.00%
Expected volatility of stock	32.50%		36.00%
Minimum [Member]
Share-Based Payment Arrangement [Abstract]
Expected volatility of stock		37.00%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of stock		37.00%
Maximum [Member]
Share-Based Payment Arrangement [Abstract]
Expected volatility of stock		38.00%
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected volatility of stock		38.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
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-Name Accounting Standards Codification
-Section 35
-Paragraph 1D
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480483/718-10-35-1D

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-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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Reference 18: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

ACCRUED AND OTHER CURRENT LIABILITIES - Schedule of Accrued and Other Current Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Payables and Accruals [Abstract]
Compensation and related benefits	$ 217.0	$ 168.0
Income taxes payable, current	138.0	11.0
Interest	125.0	170.0
Contract liabilities, current (Note 5)	79.0	45.0
Provision for Loss on Contracts	42.0	40.0
Product warranties	28.0	26.0
Dividend equivalent payments, current (Note 18)	19.0	39.0
Environmental and other litigation reserves (Note 15)	16.0	25.0
Current operating lease liabilities (Note 19)	16.0	18.0
Foreign currency forward exchange contracts (Note 21)	5.0	11.0
Other	169.0	168.0
Accrued and other current liabilities	$ 854.0	$ 721.0

ACCRUED AND OTHER CURRENT LIABILITIES

12 Months Ended

Sep. 30, 2023

Payables and Accruals [Abstract]

ACCRUED AND OTHER CURRENT LIABILITIES

Accrued and other current liabilities consist of the following (in millions):


	September 30, 2023		September 30, 2022
Compensation and related benefits	$	217	$	168
Income taxes payable, current	138		11
Interest	125		170
Contract liabilities, current (Note 5)	79		45
Loss contract reserves	42		40
Product warranties	28		26
Dividend equivalent payments, current (Note 18)	19		39
Environmental and other litigation reserves (Note 15)	16		25
Current operating lease liabilities (Note 19)	16		18
Foreign currency forward exchange contracts (Note 21)	5		11
Other	169		168
Accrued and other current liabilities	$	854	$	721

DERIVATIVES AND HEDGING ACTIVITIES - Schedule of Interest Rate Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 214	$ 195
Derivative Liability, Fair Value, Gross Liability	$ 4	$ 0
Minimum [Member] \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Derivative, Variable Interest Rate	2.00%
Maximum [Member] \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Derivative, Variable Interest Rate	3.50%
Interest rate swap beginning March 31, 2023 and Maturing June 28, 2024 (1)
Derivative [Line Items]
Derivative, Notional Amount	$ 400
Derivative, Fixed Interest Rate	6.25%
Derivative, Variable Interest Rate	3.00%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate swap beginning March 31, 2023 and Maturing June 28, 2024 (2)
Derivative [Line Items]
Derivative, Notional Amount	$ 900
Derivative, Fixed Interest Rate	6.35%
Derivative, Variable Interest Rate	3.10%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate swap beginning March 31, 2023 and Maturing March 31, 2025 (1)
Derivative [Line Items]
Derivative, Notional Amount	$ 500
Derivative, Fixed Interest Rate	6.25%
Derivative, Variable Interest Rate	3.00%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate swap beginning March 31, 2023 and Maturing March 31, 2025 (2)
Derivative [Line Items]
Derivative, Notional Amount	$ 1,500
Derivative, Fixed Interest Rate	6.35%
Derivative, Variable Interest Rate	3.10%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate swap beginning March 31, 2023 and Maturing September 30, 2025 (1)
Derivative [Line Items]
Derivative, Notional Amount	$ 700
Derivative, Fixed Interest Rate	4.55%
Derivative, Variable Interest Rate	1.30%
Derivative, Basis Spread on Variable Rate	3.25%
Interest rate cap beginning March 31, 2023 and Maturing September 30, 2025
Derivative [Line Items]
Derivative, Notional Amount	$ 700
Derivative, Cap Interest Rate	1.25%
Interest rate collar beginning September 30, 2025 and Maturing September 30, 2026
Derivative [Line Items]
Derivative, Notional Amount	$ 500
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026
Derivative [Line Items]
Derivative, Notional Amount	$ 1,100
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026 \| Minimum [Member] \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Derivative, Variable Interest Rate	2.00%
Interest rate collar beginning March 31, 2025 and Maturing September 30, 2026 \| Maximum [Member] \| Secured Overnight Financing Rate (SOFR)
Derivative [Line Items]
Derivative, Variable Interest Rate	3.50%

Pay vs Performance Disclosure - USD ($) $ in Millions	12 Months Ended
Pay vs Performance Disclosure - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Pay vs Performance Disclosure
Net Income (Loss) Attributable to Parent	$ 1,298	$ 866	$ 680

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References

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+ Details

DERIVATIVES AND HEDGING ACTIVITIES - Schedule of Notional Amounts (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 214	$ 195
Derivative Liability, Fair Value, Gross Liability	4	0
Interest Rate Cap
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	53	50
Derivative Liability, Fair Value, Gross Liability	1	0
Interest Rate Collar
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	17	0
Derivative Liability, Fair Value, Gross Liability	0	0
Interest Rate Swap [Member]
Derivative [Line Items]
Derivative Asset, Fair Value, Gross Asset	144	145
Derivative Liability, Fair Value, Gross Liability	$ 3	$ 0

SEGMENTS

12 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

SEGMENTS

The Company’s businesses are organized and managed in three reporting segments: Power & Control, Airframe and Non-aviation.

The Power & Control segment includes operations that primarily develop, produce and market systems and components that predominately provide power to or control power of the aircraft utilizing electronic, fluid, power and mechanical motion control technologies. Major product offerings include mechanical/electromechanical actuators and controls, ignition systems and engine technology, specialized pumps and valves, power conditioning devices, specialized AC/DC electric motors and generators, batteries and chargers, databus and power controls, advanced sensor products, switches and relay panels, high performance hoists, winches and lifting devices, and cargo loading, handling and delivery systems. Primary customers of this segment are engine and power system and subsystem suppliers, airlines, third party maintenance suppliers, military buying agencies and repair depots. Products are sold in the original equipment and aftermarket market channels.

The Airframe segment includes operations that primarily develop, produce and market systems and components that are used in non-power airframe applications utilizing airframe and cabin structure technologies. Major product offerings include engineered latching and locking devices, engineered rods, engineered connectors and elastomer sealing solutions, cockpit security components and systems, specialized and advanced cockpit displays, engineered audio, radio and antenna systems, specialized lavatory components, seat belts and safety restraints, engineered and customized interior surfaces and related components, thermal protection and insulation, lighting and control technology, parachutes and specialized flight, wind tunnel and jet engine testing services and equipment. Primary customers of this segment are airframe manufacturers and cabin system suppliers and subsystem suppliers, airlines, third party maintenance suppliers, military buying agencies and repair depots. Products are sold in the original equipment and aftermarket market channels.

The Non-aviation segment includes operations that primarily develop, produce and market products for non-aviation markets. Major product offerings include seat belts and safety restraints for ground transportation applications, mechanical/electromechanical actuators and controls for space applications, hydraulic/electromechanical actuators and fuel valves for land-based gas turbines, and refueling systems for heavy equipment used in mining, construction and other industries and turbine controls for the energy and oil and gas markets. Primary customers of this segment are off-road vehicle suppliers and subsystem suppliers, child restraint system suppliers, satellite and space system suppliers, manufacturers of heavy equipment used in mining, construction and other industries and turbine original equipment manufacturers, gas pipeline builders and electric utilities.

The primary measurement used by management to review and assess the operating performance of each segment is EBITDA As Defined. The Company defines EBITDA As Defined as earnings before interest, taxes, depreciation and amortization plus certain non-operating items recorded as corporate expenses including non-cash compensation charges incurred in connection with the Company’s stock incentive or deferred compensation plans, restructuring costs related to the Company's cost reduction measures in response to the COVID-19 pandemic, foreign currency gains and losses, acquisition-integration costs, acquisition and divestiture transaction-related expenses, and refinancing costs. COVID-19 restructuring costs represented actions primarily taken by the Company in fiscal 2021 and 2020 only, to reduce its workforce to align with customer demand, as well as incremental costs related to the pandemic that were not expected to recur once the pandemic subsided and were clearly separable from normal operations (e.g., additional cleaning and disinfecting of facilities by contractors above and beyond normal requirements, personal protective equipment). Acquisition and divestiture-related costs represent accounting adjustments to inventory associated with acquisitions of businesses and product lines that were charged to cost of sales when the inventory was sold; costs incurred to integrate acquired businesses and product lines into the Company’s operations, facility relocation costs and other acquisition-related costs; transaction-related costs for both acquisitions and divestitures comprising deal fees; legal, financial and tax diligence expenses and valuation costs that are required to be expensed as incurred and other acquisition accounting adjustments.

EBITDA As Defined is not a measurement of financial performance under U.S. GAAP. Although the Company uses EBITDA As Defined to assess the performance of its business and for various other purposes, the use of this non-GAAP financial measure as an analytical tool has limitations, and it should not be considered in isolation or as a substitute for analysis of the Company’s results of operations as reported in accordance with U.S. GAAP.

The Company’s segments are reported on the same basis used internally for evaluating performance and for allocating resources. The accounting policies for each segment are the same as those described in the summary of significant accounting policies in Note 3 to the Company’s consolidated financial statements. Intersegment sales and transfers are recorded at values based on market prices, which creates intercompany profit on intersegment sales or transfers that is eliminated in consolidation. Intersegment sales were immaterial for the periods presented below. Corporate consists of our corporate offices. Corporate expenses consist primarily of compensation, benefits, professional services and other administrative costs incurred by the corporate offices. Corporate assets consist primarily of cash and cash equivalents. Corporate expenses and assets reconcile reportable segment data to the consolidated totals. An immaterial amount of corporate expenses is allocated to the operating segments.

The following table presents net sales by reportable segment (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Net sales to external customers
Power & Control
Commercial and non-aerospace OEM	$	690	$	603	$	524
Commercial and non-aerospace aftermarket	1,057		847		573
Defense	1,569		1,423		1,453
Total Power & Control	3,316		2,873		2,550

Airframe
Commercial and non-aerospace OEM	961		715		582
Commercial and non-aerospace aftermarket	1,140		785		553
Defense	993		891		948
Total Airframe	3,094		2,391		2,083

Total Non-aviation	175		165		165

Net Sales	$	6,585	$	5,429	$	4,798

The following table reconciles EBITDA As Defined by segment to consolidated income from continuing operations before income taxes (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
EBITDA As Defined
Power & Control	$	1,866	$	1,531	$	1,319
Airframe	1,547		1,121		878
Non-aviation	71		65		62
Total segment EBITDA As Defined	3,484		2,717		2,259
Less: Unallocated corporate EBITDA As Defined	89		71		70
Total Company EBITDA As Defined	3,395		2,646		2,189
Depreciation and amortization expense	268		253		253
Interest expense-net	1,164		1,076		1,059
Acquisition and divestiture transaction-related expenses	18		18		35
Non-cash stock and deferred compensation expense	157		184		130
Refinancing costs	56		1		37
COVID-19 pandemic restructuring costs	—		—		40
Gain on sale of businesses-net	—		(7)		(69)
Other, net	16		(6)		(11)
Income from continuing operations before income taxes	$	1,716	$	1,127	$	715

The following table presents capital expenditures and depreciation and amortization by segment (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Capital expenditures
Power & Control	$	67	$	63	$	65
Airframe	65		52		37
Non-aviation	6		3		2
Corporate	1		1		1
	$	139	$	119	$	105
Depreciation and amortization
Power & Control	$	110	$	109	$	107
Airframe	152		138		139
Non-aviation	5		5		6
Corporate	1		1		1
	$	268	$	253	$	253

The following table presents total assets by segment (in millions):


	September 30, 2023		September 30, 2022
Total assets
Power & Control	$	7,315	$	6,994
Airframe	8,972		7,781
Non-aviation	234		238
Corporate	3,449		3,094
	$	19,970	$	18,107

Geographic Area Information

Net sales are measured based on the geographic destination of sales. Long-lived assets consist of property, plant and equipment-net and operating lease right-of-use assets. Net sales and long-lived assets of individual countries outside of the United States are not material.

The following table presents net sales by geographic area (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Net sales
United States	$	4,265	$	3,496	$	3,096
Foreign Countries	2,320		1,933		1,702
	$	6,585	$	5,429	$	4,798

The following table presents long-lived assets by geographic area (in millions):


	September 30, 2023		September 30, 2022
Long-lived assets
United States	$	1,063	$	663
Foreign Countries	256		229
	$	1,319	$	892

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-21

Reference 14: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 32
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482810/280-10-50-32

+ Details

STOCK-BASED COMPENSATION

12 Months Ended

Sep. 30, 2023

Share-Based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

The Company’s equity compensation plans are designed to assist the Company in attracting, retaining, motivating and rewarding key employees, directors or consultants, and promoting the creation of long-term value for stockholders by closely aligning the interests of these individuals with those of the Company’s stockholders. The Company’s equity compensation plans provide for the granting of stock options.

Non-cash stock compensation expense recognized by the Company during the fiscal years ended September 30, 2023, 2022 and 2021 was $135 million, $153 million and $129 million, respectively. The related tax benefit for the fiscal years ended September 30, 2023, 2022 and 2021 was $15 million, $18 million and $21 million, respectively. Of the non-cash stock compensation expense recorded in fiscal 2023, 2022 and 2021, $112 million, $151 million and $121 million was recorded as a component of additional paid in capital and $23 million, $2 million and $8 million was recorded as a component of other non-current liabilities. The liability awards relate to stock options granted between fiscal 2017 to fiscal 2020 from the 2014 stock option plan to certain employees in lieu of these individuals receiving salary and bonus compensation paid in cash. The vesting of the stock options are subject to the achievement of the same operating performance goals as other grants. The liability is remeasured each reporting period based on the market value of our common shares on the last day of the reported period. The other non-current liabilities related to stock-based compensation as of September 30, 2023 and 2022 was $48 million and $26 million, respectively.

The weighted-average grant date fair value of options granted during the fiscal years ended September 30, 2023, 2022 and 2021 was $251.73, $254.21 and $193.47, respectively. The total fair value of options vested during fiscal years ended September 30, 2023, 2022 and 2021 was $80 million, $88 million and $92 million, respectively.

Compensation expense is recognized based upon probability assessments of awards that are expected to vest in future periods, adjusted for expected forfeitures. Such probability assessments are subject to revision and, therefore, unrecognized compensation expense is subject to future changes in estimate. As of September 30, 2023, there was approximately $198 million of total unrecognized compensation expense related to non-vested awards expected to vest, which is expected to be recognized over a weighted-average period of 2.0 years.


	Fiscal Years Ended September 30,
	2023	2022	2021
Risk-free interest rate	3.45% to 4.20%	1.47% to 2.97%	0.42% to 0.86%
Expected life of options	6.5 years	6.5 years	5.5 years
Expected dividend yield of stock	—	—	—
Expected volatility of stock	32.5%	37.0% to 38.0%	36.0%

The risk-free interest rate is based upon the U.S. Treasury bond rates with a term similar to the expected life of the award as of the grant date or modification date. The average expected life of stock-based awards is based on the Company’s actual historical exercise experience. The Company uses actual historical changes in the market value of its stock to calculate the volatility assumption as it is management’s belief that this is the best indicator of future volatility. The Company estimates stock option forfeitures based on historical data. The total number of stock options expected to vest is adjusted by actual and estimated forfeitures. Changes to the actual and estimated forfeitures will result in a cumulative adjustment in the period of change. Notwithstanding the special cash dividends declared and paid from time to time, the Company historically has not declared and paid regular cash dividends and does not anticipate declaring and paying regular cash dividends in future periods; thus, no dividend yield assumption is used.

2019 Stock Option Plan

In August 2019, the Board of Directors of TD Group adopted a new stock option plan, which was subsequently approved by stockholders on October 3, 2019. The 2019 stock option plan permits TD Group to award stock options to our key employees, directors or consultants. The total number shares of TD Group common stock reserved for issuance or delivery under the 2019 stock option plan is 4,000,000, subject to adjustment in the event of any stock dividend or split, reorganization, recapitalization, merger, share exchange or any other similar corporate transaction or event.

Performance Vested Stock Options – Generally all of the options granted through September 30, 2023 under the 2019 stock option plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, generally all of the options granted will vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2023:


	Number of Options	Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2022	—	$	—
Granted	223,945	627.81
Exercised	—	—
Forfeited	—	—
Expired	—	—
Outstanding at September 30, 2023	223,945	$	627.81	9.2 years	$	48,220,048
Expected to vest	85,948	$	627.36	9.2 years	$	18,545,000
Exercisable at September 30, 2023	41,269	$	631.65	9.3 years	$	8,727,648

At September 30, 2023, there were 3,776,055 remaining shares available for award under TD Group’s 2019 stock option plan.

2014 Stock Option Plan

In July 2014, the Board of Directors of TD Group adopted the 2014 stock option plan, which was subsequently approved by stockholders on October 2, 2014. The 2014 stock option plan permits TD Group to award stock options to our key employees, directors or consultants. The total number of shares of TD Group common stock reserved for issuance or delivery under the 2014 stock option plan is 5,000,000, subject to adjustment in the event of any stock dividend or split, reorganization, recapitalization, merger, share exchange or any other similar corporate transaction or event.

Performance Vested Stock Options – Generally all of the options granted through September 30, 2023 under the 2014 stock option plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, generally all of the options granted will vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2023:


	Number of Options	Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2022	4,302,706	$	424.54
Granted	374,965	598.84
Exercised	(312,555)	323.15
Forfeited	(117,875)	580.76
Expired	(920)	610.00
Outstanding at September 30, 2023	4,246,321	$	443.02	5.9 years	$	1,698,993,209
Expected to vest	934,190	$	591.97	7.9 years	$	234,631,160
Exercisable at September 30, 2023	3,065,412	$	385.97	5.1 years	$	1,401,378,878

At September 30, 2023, there were 90,281 remaining shares available for award under TD Group’s 2014 stock option plan.

2006 Stock Incentive Plan

In conjunction with the consummation of the Company’s initial public offering, a 2006 stock incentive plan was adopted by TD Group. In July 2008 and March 2011, the 2006 stock incentive plan was amended to increase the number of shares available for issuance thereunder. TD Group reserved 8,119,668 shares of its common stock for issuance to key employees, directors or consultants under the plan. Awards under the plan were in the form of options, restricted stock or other stock-based awards. Options granted under the plan expire no later than the tenth anniversary of the applicable date of grant of the options, and have an exercise price of not less than the fair market value of our common stock on the date of grant. Restricted stock granted under the plan vested over three years. No restricted stock units remained outstanding as of September 30, 2018.

Performance Vested Stock Options – All of the options granted under the 2006 stock incentive plan have been pursuant to an equity incentive program adopted by the Company in 2008. Under the 2008 equity incentive program, all of the options granted vest based on the Company’s achievement of established operating performance goals. The following table summarizes the activity, pricing and other information for the Company’s performance vested stock-based award activity during the fiscal year ended September 30, 2023:


	Number of Options	Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2022	1,082,985	$	193.05
Granted	—	—
Exercised	(632,793)	179.93
Forfeited	—	—
Expired	—	—
Outstanding at September 30, 2023	450,192	$	211.49	1.8 years	$	284,357,481
Exercisable at September 30, 2023	450,192	$	211.49	1.8 years	$	284,357,481

The 2006 stock incentive plan expired on March 14, 2016 and no further shares were granted under the plan thereafter.

The total intrinsic value of performance options exercised during the fiscal years ended September 30, 2023, 2022 and 2021 was $500 million, $279 million and $355 million, respectively.

Dividends and Dividend Equivalent Plans

Dividend equivalent payments are made during the Company's first fiscal quarter each year and also upon payment of any dividends declared within the current fiscal year. On November 9, 2023, the Company announced that TD Group's Board of Directors authorized and declared a special cash dividend of $35.00 on each outstanding share of common stock and cash dividend equivalent payments on eligible vested options outstanding under its stock option plans. The record date and payment date for the special dividend is November 20, 2023 and November 27, 2023, respectively. The total estimated cash payment, to be funded by existing cash on hand, related to the special dividend and dividend equivalent payments in the first quarter of fiscal 2024 is approximately $2,020 million.

Until August 5, 2022, pursuant to the 2014 Stock Option Plan Dividend Equivalent Plan and the Third Amended and Restated 2006 Stock Incentive Plan Dividend Equivalent Plan, all of the vested options granted under the existing stock option plans were entitled to certain dividend equivalent payments in the event of the declaration of a dividend by the Company. On August 5, 2022, the Board of Directors adopted the Fourth Amended and Restated TransDigm Group Incorporated 2006 Stock Incentive Plan Dividend Equivalent Plan, the Amended and Restated 2014 Stock Option Plan Dividend Equivalent Plan and the 2019 Stock Option Plan Dividend Equivalent Plan, pursuant to which, all of the vested options granted under the existing stock option plans, except for grants to the members of the Board of Directors, are entitled to certain dividend equivalent payments in the event of the declaration of a dividend by the Company. The amendments did not represent a change in the Company’s practice. In August 2022, all members of the Board of Directors at that time executed amendments to their option agreements resulting in the directors no longer receiving dividend equivalent payments in cash, but rather for dividends declared after June 1, 2022, dividends result in a reduction of strike price.

Dividend equivalent payments on vested options were $38 million, $86 million and $73 million during the fiscal years ended September 30, 2023, 2022 and 2021, respectively. At September 30, 2023, there was $19 million recorded in accrued and other current liabilities and $9 million recorded in other non-current liabilities on the consolidated balance sheets related to future dividend equivalent payments.

TRADE ACCOUNTS RECEIVABLE

12 Months Ended

Sep. 30, 2023

Receivables [Abstract]

TRADE ACCOUNTS RECEIVABLE

Trade accounts receivable consist of the following (in millions):


	September 30, 2023		September 30, 2022
Trade accounts receivable—gross	$	1,261	$	1,002
Allowance for uncollectible accounts	(31)		(35)
Trade accounts receivable—Net	$	1,230	$	967

At September 30, 2023, none of our customers individually accounted for greater than 10% of the Company’s trade accounts receivable-gross. In addition, approximately 36% of the Company’s trade accounts receivable-gross was due from entities that operate principally outside of the United States - primarily in Western Europe, Canada and Asia. Credit is extended based on an evaluation of each customer’s financial condition and collateral is generally not required.

The decrease in the allowance for uncollectible accounts for the fiscal year ended September 30, 2023 is primarily due to the continued recovery of commercial aerospace industry and our related customers in fiscal 2023 from the adverse impact of the COVID-19 pandemic. The allowance for uncollectible accounts is assessed individually at each operating unit by the operating unit’s management team.

Refer to Note 3, “Summary of Significant Accounting Policies,” for additional information regarding the Company’s allowance for uncollectible accounts.

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
OPERATING ACTIVITIES:
Net income	$ 1,299	$ 867	$ 681
Income from discontinued operations, net of tax	0	(1)	0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	129	116	115
Amortization of intangible assets and product certification costs	139	137	138
Amortization of debt issuance costs, original issue discount and premium	41	34	34
Amortization of inventory step-up	2	3	6
Amortization of loss contract reserves	(34)	(39)	(55)
Refinancing costs	56	1	37
GAIN ON SALE OF BUSINESSES—NET	0	(7)	(69)
Non-cash stock and deferred compensation expense	157	184	129
Deferred income taxes	3	(22)	34
Foreign currency exchange losses (gains)	14	(40)	11
Gain on insurance proceeds from fire	0	0	(24)
(Gain) Loss on settlement of the Esterline Retirement Plan (the “ERP”)	(9)	22	0
Cash refund (contribution) for the ERP settlement, net	9	(16)	0
Changes in assets/liabilities, net of effects from acquisitions and sales of businesses:
Trade accounts receivable	(212)	(190)	(78)
Inventories	(261)	(134)	79
Income taxes payable (receivable)	168	58	(63)
Other assets	(44)	(56)	(33)
Accounts payable	12	58	3
Accrued interest	(45)	(21)	14
Accrued and other liabilities	(49)	(6)	(46)
Net cash provided by operating activities	1,375	948	913
INVESTING ACTIVITIES:
Capital expenditures	(139)	(119)	(105)
Acquisition of businesses, net of cash acquired	(762)	(437)	(963)
Net proceeds from sale of businesses	1	3	259
Proceeds from Insurance Settlement, Investing Activities	0	0	24
Net cash used in investing activities	(900)	(553)	(785)
FINANCING ACTIVITIES:
Proceeds from exercise of stock options	215	132	128
Dividends and dividend equivalent payments	(38)	(1,091)	(73)
Repurchases of common stock	0	(912)	0
Proceeds from issuance of senior secured notes, net	3,504	0	0
Repayments of senior secured notes, net	(1,122)	0	0
Proceeds from issuance of senior subordinated notes, net	0	0	1,932
Repayments of senior subordinated notes, net	(1,459)	0	(1,982)
Proceeds from revolving credit facility	0	0	200
Repayment on revolving credit facility	0	(200)	(200)
Proceeds from term loans, net	6,238	0	0
Repayment on term loans	7,334	75	75
Financing costs and other, net	(20)	(2)	0
Net cash used in financing activities	(16)	(2,148)	(70)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	12	(33)	12
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	471	(1,786)	70
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	3,001	4,787	4,717
CASH AND CASH EQUIVALENTS, END OF PERIOD	3,472	3,001	4,787
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for interest, net	1,160	1,057	1,008
Cash paid during the period for income taxes, net of refunds	$ 260	$ 220	$ 83

FAIR VALUE MEASUREMENTS Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Assets, Carrying Amount	$ 3,472	$ 3,001
Short-term borrowings - trade receivable securitization facility, Carrying Amount	349	350
Long-term Debt	19,401	19,445
Other Noncurrent Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	53	50
Interest Rate Swap Asset Carrying Amount	41	68
Interest Rate Collar Assets	17	0
Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign Currency Contract, Liability	5	11
Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap agreements, Liabilities, Carrying Amount	3	0
Interest Rate Cap Liabilities	1	0
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Asset Carrying Amount	103	77
Term Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	6,179	7,256
Government Refundable Advances [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	21	23
Finance Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	193	146
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents, Assets, Fair Value	3,472	3,001
Fair Value, Inputs, Level 2 [Member] \| Other Noncurrent Assets
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cap Assets	53	50
Interest Rate Swap Asset at Fair Value	41	68
Interest Rate Collar Assets	17	0
Fair Value, Inputs, Level 2 [Member] \| Accrued Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Foreign Currency Contract, Liability	5	11
Fair Value, Inputs, Level 2 [Member] \| Other Non-Current Liabilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Cash Flow Hedge Liability at Fair Value	3	0
Interest Rate Cap Liabilities	1	0
Fair Value, Inputs, Level 2 [Member] \| Prepaid Expenses and Other Current Assets [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest Rate Swap Asset at Fair Value	103	77
Fair Value, Inputs, Level 2 [Member] \| Term Loans [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	6,212	6,976
Fair Value, Inputs, Level 2 [Member] \| Government Refundable Advances [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	21	23
Fair Value, Inputs, Level 2 [Member] \| Finance Lease Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	193	146
Senior Secured Notes $1,100M due 2025 8.00% \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	0	1,094
Senior Secured Notes $1,100M due 2025 8.00% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	0	1,115
Senior Subordinated Notes $950M due 2026 6.375% \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	0	946
Senior Subordinated Notes $950M due 2026 6.375% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	0	884
Senior Subordinated Notes $500M due 2026 6.875% \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	0	495
Senior Subordinated Notes $500M due 2026 6.875% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	0	473
Senior Secured Notes $4.4B Due 2026 6.25% \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	4,377	4,368
Senior Secured Notes $4.4B Due 2026 6.25% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	4,329	4,257
Senior Subordinated Notes $550M due 2027 7.50% \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	548	547
Senior Subordinated Notes $550M due 2027 7.50% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	549	524
Senior Subordinated Notes $2,650M due 2027 5.50% \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	2,638	2,635
Senior Subordinated Notes $2,650M due 2027 5.50% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,484	2,286
Senior Subordinated Notes $1,200M due 2029 4.625% \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	1,193	1,191
Senior Subordinated Notes $1,200M due 2029 4.625% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,047	966
Senior Subordinated Notes $750M due 2029 4.875% \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	745	744
Senior Subordinated Notes $750M due 2029 4.875% \| Fair Value, Inputs, Level 1 [Member] \| Senior Subordinated Notes [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	654	606
Senior Secured Notes $2,100M due 2028 6.75% \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	2,071	0
Senior Secured Notes $2,100M due 2028 6.75% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	2,069	0
Senior Secured Notes $1,450M due 2030 6.875% \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt	1,436	0
Senior Secured Notes $1,450M due 2030 6.875% \| Fair Value, Inputs, Level 1 [Member] \| Secured Debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	1,423	0
Asset-backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings - trade receivable securitization facility, Carrying Amount	349	350
Asset-backed Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Short-term borrowings - trade receivable securitization facility, Fair Value	$ 349	$ 350

ACCUMULATED OTHER COMPREHENSIVE LOSS (Tables)

12 Months Ended

Sep. 30, 2023

Equity [Abstract]

Schedule of Accumulated Other Comprehensive Loss


	Unrealized gains (losses) on derivatives (1)		Pension and post-retirement benefit plans adjustment (2)		Foreign currency translation adjustment (3)		Total
Balance at September 30, 2021	$	(229)	$	(18)	$	(1)	$	(248)


Net current-period other comprehensive income (loss) (4)	352		8		(379)		(19)
Balance at September 30, 2022	123		(10)		(380)		(267)


Net current-period other comprehensive income (4)	20		12		137		169
Balance at September 30, 2023	$	143	$	2	$	(243)	$	(98)

Schedule of Amounts Recognized in Other Comprehensive Loss [Table Text Block]

DEBT (Tables)

12 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

Schedule of Debt

The Company’s debt consists of the following (in millions):


	September 30, 2023
	Gross Amount		Debt Issuance Costs		Original Issue (Discount) or Premium		Net Amount
Short-term borrowings—trade receivable securitization facility	$	350	$	(1)	$	—	$	349
Term loans	$	6,249	$	(22)	$	(48)	$	6,179
6.25% secured notes due 2026 (“2026 Secured Notes”)	4,400		(25)		2		4,377
7.50% senior subordinated notes due 2027 (“7.50% 2027 Notes”)	550		(2)		—		548
5.50% senior subordinated notes due 2027 (“5.50% 2027 Notes”)	2,650		(12)		—		2,638
6.75% secured notes due 2028 (“2028 Secured Notes”)	2,100		(19)		(10)		2,071
4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”)	1,200		(7)		—		1,193
4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”)	750		(5)		—		745
6.875% secured notes due 2030 (“2030 Secured Notes”)	1,450		(14)		—		1,436
Government refundable advances	21		—		—		21
Finance lease obligations	193		—		—		193
	19,563		(106)		(56)		19,401
Less: current portion	71		—		—		71
Long-term debt	$	19,492	$	(106)	$	(56)	$	19,330


	September 30, 2022
	Gross Amount		Debt Issuance Costs		Original Issue (Discount) or Premium		Net Amount
Short-term borrowings—trade receivable securitization facility	$	350	$	—	$	—	$	350
Term loans	$	7,298	$	(29)	$	(13)	$	7,256
8.00% secured notes due 2025 (“2025 Secured Notes”)	1,100		(6)		—		1,094
6.375% senior subordinated notes due 2026 (“6.375% 2026 Notes”)	950		(4)		—		946
6.875% senior subordinated notes due 2026 (“6.875% 2026 Notes”)	500		(3)		(2)		495
2026 Secured Notes	4,400		(35)		3		4,368
7.50% 2027 Notes	550		(3)		—		547
5.50% 2027 Notes	2,650		(15)		—		2,635
4.625% 2029 Notes	1,200		(9)		—		1,191
4.875% 2029 Notes	750		(6)		—		744
Government refundable advances	23		—		—		23
Finance lease obligations	146		—		—		146
	19,567		(110)		(12)		19,445
Less: current portion	77		(1)		—		76
Long-term debt	$	19,490	$	(109)	$	(12)	$	19,369

Schedule of Term Loans

As of September 30, 2023 and 2022, TransDigm had $6,249 million and $7,298 million in fully drawn term loans (the “Term Loans Facility”) and $810 million in revolving commitments, of which $759 million and $779 million was available to the Company as of September 30, 2023 and 2022, respectively, subject to an interest rate of 2.50% per annum. The unused portion of the revolving commitments is subject to a fee of 0.5% per annum.


Term Loans Facility	Maturity Date	Interest Rate	Aggregate Principal as of September 30,
			2023		2022
Tranche H	February 22, 2027	Term SOFR plus 3.25%	$	1,713	$	—
Tranche I	August 24, 2028	Term SOFR plus 3.25%	$	4,536	$	—
Tranche E (1)	May 30, 2025	LIBOR plus 2.25%	$	—	$	2,155
Tranche F (1)	December 9, 2025	LIBOR plus 2.25%	$	—	$	3,418
Tranche G (1)	August 22, 2024	LIBOR plus 2.25%	$	—	$	1,725

(1)As previously disclosed within this note, during fiscal 2023, Tranches E, F and G were replaced by Tranches H and I.

Future Maturities of Long-Term Debt

At September 30, 2023, future maturities of long-term debt (excluding finance leases) are as follows (in millions), refer to Note 19, “Leases,” for future maturities of finance leases:


Fiscal Years Ended September 30,
2024	$	66
2025	66
2026	4,466
2027	2,260
2028	9,108
Thereafter	3,404
Total	$	19,370

- Definition

Tabular disclosure of long-debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation. These are debt arrangements that originally required repayment more than twelve months after issuance or greater than the normal operating cycle of the entity, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 69B
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69B

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 470
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-Name Accounting Standards Codification
-Section 55
-Paragraph 69E
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-URI https://asc.fasb.org//1943274/2147481568/470-20-55-69E

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04(a))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-3

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI https://asc.fasb.org//1943274/2147482925/835-30-45-2

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 30
-Section 45
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Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef
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Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef
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-URI https://asc.fasb.org//1943274/2147481112/505-10-50-7

+ Details

PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Sep. 30, 2023

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consist of the following (in millions):


	September 30, 2023		September 30, 2022
Land and improvements	$	119	$	103
Buildings and improvements	567		461
Machinery, equipment and other	1,334		945
Construction-in-progress	105		78
Total	2,125		1,587
Accumulated depreciation	(870)		(780)
Property, plant and equipment—Net	$	1,255	$	807

LEASES (Tables)

12 Months Ended

Sep. 30, 2023

Leases [Abstract]

Lease, Cost

The components of lease expense for the fiscal years ended September 30, 2023 and 2022 are as follows (in millions):


		Fiscal Years Ended September 30,
	Classification	2023		2022
Operating lease cost	Cost of sales or selling and administrative expenses	$	21	$	24
Finance lease cost:
Amortization of leased assets	Cost of sales	9		6
Interest on lease liabilities	Interest expense-net	13		9
Total lease cost		$	43	$	39

Schedule of Cash Flow, Supplemental Disclosures

Supplemental cash flow information related to leases for the fiscal years ended September 30, 2023 and 2022 is as follows (in millions):


	Fiscal Years Ended September 30,
	2023		2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$	21	$	24
Operating cash outflows from finance leases	10		8
Financing cash outflows from finance leases	5		2

Lease assets obtained in exchange for new lease obligations:
Operating leases	$	17	$	21
Financing leases	48		51

Operating Leases, Supplemental Balance Sheet Information

Supplemental balance sheet information related to leases is as follows (in millions):


	Classification	September 30, 2023		September 30, 2022
Operating Leases
Operating lease right-of-use assets	Other non-current assets	$	64	$	85

Current operating lease liabilities	Accrued and other current liabilities	16		18
Long-term operating lease liabilities	Other non-current liabilities	51		71
Total operating lease liabilities		$	67	$	89

Finance Leases
Finance lease right-of-use assets, net	Property, plant and equipment-net	$	176	$	137

Current finance lease liabilities	Current portion of long-term debt	5		2
Long-term finance lease liabilities	Long-term debt	188		144
Total finance lease liabilities		$	193	$	146

Leases, Weighted-Average Term and Discount Rate Remaining

As of September 30, 2023, the Company has the following remaining lease term and weighted average discount rates:


Weighted-average remaining lease term
Operating leases			5.5 years
Finance leases			20.0 years

Weighted-average discount rate
Operating leases			6.1%
Finance leases			7.0%

Finance Lease, Liability, Maturity

Maturities of lease liabilities at September 30, 2023 are as follows (in millions):


	Operating Leases		Finance Leases
2024	$	20	$	16
2025	18		17
2026	13		17
2027	10		17
2028	6		17
Thereafter	13		295
Total future minimum lease payments	80		379
Less: imputed interest	13		186
Present value of lease liabilities reported	$	67	$	193

Lessee, Operating Lease, Liability, Maturity

Maturities of lease liabilities at September 30, 2023 are as follows (in millions):


	Operating Leases		Finance Leases
2024	$	20	$	16
2025	18		17
2026	13		17
2027	10		17
2028	6		17
Thereafter	13		295
Total future minimum lease payments	80		379
Less: imputed interest	13		186
Present value of lease liabilities reported	$	67	$	193

LEASES - Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating Lease, Payments	$ 21	$ 24
Finance Lease, Interest Payment on Liability	10	8
Finance Lease, Principal Payments	5	2
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	17	21
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 48	$ 51

INCOME TAXES - Income Tax Expense Reconciliation (Detail)	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Statutory tax rate	21.00%	21.00%	21.00%
Effective Income Tax Rate Reconciliation, Tax Cuts and Jobs Act, Percent	5.30%	5.50%	(8.20%)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Percent	1.70%	0.10%	0.40%
Effective Income Tax Rate Reconciliation, Other Adjustments, Percent	0.30%	1.50%	1.70%
Effective Income Tax Rate Reconciliation, Withholding Taxes	0.20%	1.20%	0.20%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent	0.00%	(0.10%)	1.40%
Effective Income Tax Rate Reconciliation, Tax Settlement, Percent	0.30%	(0.10%)	(3.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Research, Percent	(0.40%)	(0.60%)	(1.20%)
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Percent	(0.50%)	(0.80%)	(1.20%)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Percent	0.30%	(1.00%)	2.20%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent	(1.20%)	(2.00%)	(1.50%)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent	(2.30%)	(2.80%)	(8.70%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent	0.00%	0.00%	2.10%
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent	(0.40%)	1.30%	(0.20%)
Effective Income Tax Rate Reconciliation, Percent	24.30%	23.20%	4.80%

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

Carrying Amounts and Fair Values of Financial Instruments

The following summarizes the carrying amounts and fair values of financial instruments (in millions):


		September 30, 2023				September 30, 2022
	Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	3,472	$	3,472	$	3,001	$	3,001
Interest rate swap agreements (1)	2	103		103		77		77
Interest rate swap agreements (2)	2	41		41		68		68
Interest rate cap agreements (2)	2	53		53		50		50
Interest rate collar agreements (2)	2	17		17		—		—
Liabilities:
Foreign currency forward exchange contracts (3)	2	5		5		11		11
Interest rate swap agreements (4)	2	3		3		—		—
Interest rate cap agreements (4)	2	1		1		—		—
Short-term borrowings - trade receivable securitization facility (5)	2	349		349		350		350
Long-term debt, including current portion:
Term loans (5)	2	6,179		6,212		7,256		6,976
2025 Secured Notes (5)	1	—		—		1,094		1,115
6.375% 2026 Notes (5)	1	—		—		946		884
6.875% 2026 Notes (5)	1	—		—		495		473
2026 Secured Notes (5)	1	4,377		4,329		4,368		4,257
7.50% 2027 Notes (5)	1	548		549		547		524
5.50% 2027 Notes (5)	1	2,638		2,484		2,635		2,286
2028 Secured Notes (5)	1	2,071		2,069		—		—
4.625% 2029 Notes (5)	1	1,193		1,047		1,191		966
4.875% 2029 Notes (5)	1	745		654		744		606
2030 Secured Notes (5)	1	1,436		1,423		—		—
Government refundable advances	2	21		21		23		23
Finance lease obligations	2	193		193		146		146

(1)Included in prepaid expenses and other on the consolidated balance sheets.

(2)Included in other assets on the consolidated balance sheets.

(3)Included in accrued and other current liabilities on the consolidated balance sheets.

(4)Included in other non-current liabilities on the consolidated balance sheets.

(5)The carrying amount of the debt instrument is presented net of the debt issuance costs, premium and discount. Refer to Note 12, “Debt,” for gross carrying amounts.

ACCUMULATED OTHER COMPREHENSIVE LOSS - Schedule of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	$ (267)	$ (248)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	(20)	(352)	$ (73)
Other Comprehensive Income (Loss), Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	12	8	(10)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	137	(379)	90
Other comprehensive income (loss), net of tax, attributable to TD Group	169	(19)	153
Balance at end of period	(98)	(267)	(248)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax	6	(112)	23
Pension Liability Adjustments, Net	0	1	0
Cash Flow Hedging \| Designated as Hedging Instrument \| Net Sales
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Derivative, Gain (Loss) on Derivative, Net	(3)	(6)
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit)	1	2
Cash Flow Hedging \| Designated as Hedging Instrument \| Interest Expense, Net
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Derivative, Gain (Loss) on Derivative, Net	71	(68)
Derivative, Gain (Loss) on Derivative, Tax Expense (Benefit)	22	(21)
Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges (2)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	123	(229)
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification, Tax, Parent	20	352
Balance at end of period	143	123	(229)
Defined benefit pension plan activity (3)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(10)	(18)
Other Comprehensive Income (Loss), Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	12	8
Balance at end of period	2	(10)	(18)
Currency translation adjustment
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at beginning of period	(380)	(1)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Net of Tax, Portion Attributable to Parent	137	(379)
Balance at end of period	$ (243)	$ (380)	$ (1)

AUDIT INFORMATION	12 Months Ended
AUDIT INFORMATION	Sep. 30, 2023
Audit Information [Abstract]
Auditor Firm ID	42
Auditor Name	Ernst & Young LLP
Auditor Location	Cleveland, Ohio

SEGMENTS - Narratives (Detail)	12 Months Ended
SEGMENTS - Narratives (Detail)	Sep. 30, 2023 Segment
Segment Reporting [Abstract]
Number of reporting segments	3

Valuation and Qualifying Accounts (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Allowance for Doubtful Accounts
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 35	$ 30	$ 37
Charged to Costs and Expenses	4	9	0
Acquisitions & Purchase Price Adjustments	0	0	0
Deductions from Reserve	(8)	(4)	(7)
Balance at End of Period	31	35	30
Reserve for excess and obsolete inventory
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	196	194	178
Charged to Costs and Expenses	20	21	42
Acquisitions & Purchase Price Adjustments	0	(3)	(10)
Deductions from Reserve	(7)	(22)	(36)
Balance at End of Period	209	196	194
Valuation Allowance of Deferred Tax Assets
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	137	74	132
Charged to Costs and Expenses	90	62	(58)
Acquisitions & Purchase Price Adjustments	0	(1)	0
Deductions from Reserve	0	0	0
Balance at End of Period	$ 227	$ 137	$ 74

ACCRUED AND OTHER CURRENT LIABILITIES (Tables)

12 Months Ended

Sep. 30, 2023

Payables and Accruals [Abstract]

ACCRUED AND OTHER CURRENT LIABILITIES

Accrued and other current liabilities consist of the following (in millions):


	September 30, 2023		September 30, 2022
Compensation and related benefits	$	217	$	168
Income taxes payable, current	138		11
Interest	125		170
Contract liabilities, current (Note 5)	79		45
Loss contract reserves	42		40
Product warranties	28		26
Dividend equivalent payments, current (Note 18)	19		39
Environmental and other litigation reserves (Note 15)	16		25
Current operating lease liabilities (Note 19)	16		18
Foreign currency forward exchange contracts (Note 21)	5		11
Other	169		168
Accrued and other current liabilities	$	854	$	721

RETIREMENT PLANS

12 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

RETIREMENT PLANS

The Company maintains certain non-contributory defined benefit pension plans (collectively, referred to as the “pension plans”) covering eligible employees in the U.S. and in other certain countries such as Canada, France, Germany and the United Kingdom. These pension plans generally provide benefits to employees based on formulas recognizing length of service and earnings. The Company’s funding policy is to contribute actuarial-determined amounts allowable under tax and statutory regulations for the qualified plans. The Company uses a September 30th measurement date for its defined benefit pension plans. The Company also sponsors other post-retirement pension plans for its employees in the U.S. and in Canada (collectively, referred to as the “post-retirement pension plans”). Other post-retirement pension plans are non-contributory health care and life insurance plans.

The components of net periodic pension benefit (income) cost for the pension plans at the end of each fiscal year consisted of the following (in millions):


	Defined Benefit Pension Plans
	2023				2022				2021
	U.S. Pension Plans		Non-U.S. Pension Plans		U.S. Pension Plans		Non-U.S. Pension Plans		U.S. Pension Plans		Non-U.S. Pension Plans
Service cost	$	—	$	2	$	—	$	3	$	2	$	5
Interest cost	1		7		4		4		6		5
Expected return on plan assets	—		(7)		(6)		(7)		(19)		(7)
Amortization of net loss	—		1		—		1		1		2
Settlement (gain) loss (1)	(9)		—		22		—		—		(2)
Net periodic pension benefit (income) cost	$	(8)	$	3	$	20	$	1	$	(10)	$	3

(1) Effective June 30, 2021, the Company terminated the Esterline Retirement Plan (the “ERP”) in accordance with regulatory requirements. Pension obligations were distributed through a combination of lump sum payments (using existing plan assets) to eligible plan participants and the purchase of a group annuity contract in fiscal 2022. During the third quarter of fiscal 2022, the Company transferred the remaining benefit obligations to an insurance company to purchase a group annuity contract. In connection with the transfer, a settlement loss of approximately $22 million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2022. Upon the finalization of the group annuity purchase funding during fiscal 2023, a settlement (gain) of approximately $(9) million was recorded as a component of other (income) expense in the consolidated statements of income in fiscal 2023.

Net periodic pension benefit cost for the post-retirement pension plans was less than $1 million for each of the fiscal years ended 2023, 2022 and 2021, respectively. The components of net periodic pension benefit cost other than service cost are included in other (income) expense in the consolidated statements of income. The changes in benefit obligations and plan assets, funded status and amounts recognized in the consolidated balance sheets and accumulated other comprehensive loss for the post-retirement plans at September 30, 2023 and 2022 were not material.

The changes in benefit obligations and plan assets, funded status and amounts recognized in the consolidated balance sheets and accumulated other comprehensive loss for pension plans at September 30, 2023 and 2022, were as follows (in millions):


	Defined Benefit Pension Plans
	September 30, 2023				September 30, 2022
	U.S. Pension Plans		Non-U.S. Pension Plans		U.S. Pension Plans		Non-U.S. Pension Plans
Benefit Obligations
Beginning balance	$	15	$	148	$	351	$	224
Currency translation adjustment	—		8		—		(21)
Service cost	—		2		—		3
Interest cost	1		7		4		4
Actuarial gain	(1)		(13)		(30)		(53)
Settlements	—		—		(295)		—
Benefits paid	(3)		(8)		(15)		(9)
Ending balance	$	12	$	144	$	15	$	148
Plan Assets - Fair Value
Beginning balance	$	9	$	133	$	341	$	206
Currency translation adjustment	—		6		—		(18)
Realized and unrealized gain (loss) on plan assets	11		6		(39)		(49)
Company (refunds) contributions	(9)		2		17		3
Settlements	—		—		(295)		—
Benefits paid	(3)		(8)		(15)		(9)
Ending balance	$	8	$	139	$	9	$	133
Funded Status
Fair value of plan assets	$	8	$	139	$	9	$	133
Benefit obligations	(12)		(144)		(15)		(148)
Net amount recognized	$	(4)	$	(5)	$	(6)	$	(15)
Amount Recognized on Consolidated Balance Sheets
Other non-current assets	$	—	$	12	$	—	$	6
Accrued and other current liabilities	(1)		—		(1)		(1)
Other non-current liabilities	(3)		(17)		(5)		(20)
Net amount recognized	$	(4)	$	(5)	$	(6)	$	(15)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income)
Net loss (gain)	$	1	$	1	$	3	$	12
Prior service cost	—		1		—		2
Ending balance	$	1	$	2	$	3	$	14

The accumulated benefit obligation for all pension plans was $152 million and $158 million as of September 30, 2023 and September 30, 2022, respectively.

Estimated future benefit payments expected to be paid from the pension and post-retirement pension plans or from the Company’s assets are as follows (in millions):


Fiscal Years Ended September 30,
2024	$	11
2025	11
2026	12
2027	11
2028	12
2029 - 2033	60

There is an expected funding requirement in fiscal 2024 for the non-U.S. pension plans and the U.S. pension plans maintained by the Company of $1.9 million and $0.3 million, respectively.


	U.S. Defined Benefit Pension Plans		Non-U.S. Defined Benefit Pension Plans
Principal assumptions as of year end	2023	2022	2023	2022
Discount rate	5.25%	4.29%	5.56%	4.90%
Rate of increase in future compensation levels	N/A (1)	N/A (1)	3.19%	3.38%
Assumed long-term rate of return on plan assets	5.37%	2.64%	5.41%	3.55%

(1)As a result of the plan freeze to the ERP during fiscal 2021, for all future benefit accruals and participation by new or rehired employees on or after January 1, 2021, the assumed rate of increase in future compensation levels was not applicable as of September 30, 2023 and 2022, as pay increases are not valued once a defined benefit pension plan is frozen. The ERP settlement occurred in fiscal 2022.

The Company uses discount rates developed from a yield curve established from high-quality corporate bonds and matched to plan-specific projected benefit payments. Although future changes to the discount rate and expected return on assets are unknown, had the discount rate and expected return on assets increased or decreased by 25 basis points, the impact on the fiscal 2023 net periodic benefit cost is not material. Management is not aware of any legislative or other initiatives or circumstances that will significantly impact the Company’s pension obligations in fiscal 2024.

Plan assets are invested in a diversified portfolio of equity and debt securities consisting primarily of common stocks, bonds and government securities. The objective of these investments is to maintain sufficient liquidity to fund current benefit payments and achieve targeted risk-adjusted returns. Management periodically reviews allocations of plan assets by investment type and evaluates external sources of information regarding the long-term historical returns and expected future returns for each investment type.

Allocations by investment type are as follows:


		Actual
Plan assets allocation as of fiscal year end	Target	2023	2022
Return-seeking assets (e.g., equity securities and real estate)	35% - 55%	42.7%	42.0%
Fixed-income securities (e.g., debt securities)	45% - 65%	56.0%	57.6%
Cash	0%	1.3%	0.4%
Total		100.0%	100.0%

The following table presents the fair value of the Company’s pension plan assets as of September 30, 2023 and 2022, segregated by level within the fair value hierarchy as described in Note 20, “Fair Value Measurements” (in millions):


	Fair Value Hierarchy
	September 30, 2023		September 30, 2022
Investments measured at fair value by level: (4)
Level 1 (1)	$	29	$	26
Level 2 (2)	40		41
Investments measured at net asset value (3)	78		75
Total	$	147	$	142

(1) Level 1 investments include return seeking assets, which are primarily equity securities and real estate, are actively traded on U.S. and non-U.S. exchanges and valued using the market approach at quoted market prices on the measurement date or at the net asset value of the shares held by the plan on the measurement date based on quoted market prices. Includes cash and cash equivalents which is used to pay benefits and cash invested in a short-term investment fund that holds securities with values based on quoted market prices, but for which the funds are not valued on quoted market basis.

(2) Level 2 investments include fixed-income securities, which are primarily debt securities, are primarily valued using the market approach at either quoted market prices, pricing models that use observable market data, or bids provided by independent investment brokerage firms.

(3) These investments are valued at the net asset value (“NAV”) of units held. The NAV is used to estimate fair value and is based on the fair value of the underlying investments held by the fund less its liability.

(4) No investments measured using Level 3 inputs.

Defined Contribution Plans

The Company sponsors certain defined contribution employee savings plans that cover substantially all of the Company’s U.S. employees. Under certain plans, the Company contributes a percentage of employee compensation and matches a portion of employee contributions. The cost recognized for such contributions for the fiscal years ended September 30, 2023, 2022 and 2021 was approximately $34 million, $30 million and $28 million, respectively.

TRADE ACCOUNTS RECEIVABLE - Narratives (Detail) - Trade Accounts Receivable	12 Months Ended
	Sep. 30, 2023
Customer Concentration Risk \| Customer 1
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Concentration Risk, Percentage, Accounts Receivable	10.00%
Geographic Concentration Risk \| Geographic Distribution, Foreign
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Concentration Risk, Percentage, Accounts Receivable	36.00%

SEGMENTS - Total Assets by Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 19,970	$ 18,107
Operating Segments \| Power & Control
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	7,315	6,994
Operating Segments \| Airframe
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	8,972	7,781
Operating Segments \| Non-aviation
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	234	238
Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 3,449	$ 3,094

- Definition

Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

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+ Details

CONSOLIDATED STATEMENTS OF INCOME - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
NET SALES	$ 6,585	$ 5,429	$ 4,798
COST OF SALES	2,743	2,330	2,285
GROSS PROFIT	3,842	3,099	2,513
SELLING AND ADMINISTRATIVE EXPENSES	780	748	685
AMORTIZATION OF INTANGIBLE ASSETS	139	136	137
INCOME FROM OPERATIONS	2,923	2,215	1,691
INTEREST EXPENSE—NET	1,164	1,076	1,059
REFINANCING COSTS	56	1	37
OTHER (INCOME) EXPENSE	(13)	18	(51)
GAIN ON SALE OF BUSINESSES—NET	0	(7)	(69)
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	1,716	1,127	715
INCOME TAX PROVISION	417	261	34
Income from continuing operations	1,299	866	681
Income from discontinued operations, net of tax	0	1	0
Net income	1,299	867	681
LESS: NET INCOME ATTRIBUTABLE TO NONCONTROLLING INTERESTS	(1)	(1)	(1)
NET INCOME ATTRIBUTABLE TO TD GROUP	1,298	866	680
NET INCOME APPLICABLE TO TD GROUP COMMON STOCKHOLDERS	$ 1,260	$ 780	$ 607
Earnings Per Share [Abstract]
Earnings per share from continuing operations - basic (in usd per share)	$ 22.03	$ 13.38	$ 10.41
Earnings per share from continuing operations - diluted (in usd per share)	22.03	13.38	10.41
Earnings per share from discontinued operations - basic (in usd per share)	0	0.02	0
Earnings per share from discontinued operations - diluted (in usd per share)	0	0.02	0
Earnings per share - basic (in usd per share)	22.03	13.40	10.41
Earnings per share - diluted (in usd per share)	22.03	13.40	10.41
Cash dividends paid per common share	$ 0	$ 18.50	$ 0
Weighted-average shares outstanding:
Weighted-average shares outstanding - basic (in shares)	57.2	58.2	58.4
Weighted-average shares outstanding - diluted (in shares)	57.2	58.2	58.4

STOCK REPURCHASE PROGRAM - Narratives (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Jan. 27, 2022	Sep. 30, 2020	Nov. 08, 2017
Shareholders Equity [Line Items]
Common Stock, Shares Authorized	224,400,000	224,400,000
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred stock, shares authorized	149,600,000
Preferred stock, par value	$ 0.01
Common Stock, Shares, Issued	60,995,513	60,049,685
Treasury Stock, Common, Shares	5,688,639	5,688,639
Preferred stock, shares outstanding	0	0
Stock Repurchase Program, Authorized Amount				$ 2,200		$ 650
Treasury Stock Acquired, Average Cost Per Share	$ 612.13
Payments for Repurchase of Common Stock	$ 0	$ 912	$ 0
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 1,288
Treasury Stock
Shareholders Equity [Line Items]
Treasury Stock, Common, Shares	5,688,639	5,688,639	4,198,226		4,198,226
Shares repurchased under the program	1,490,413	1,490,413

DEBT

12 Months Ended

Sep. 30, 2023

Debt Disclosure [Abstract]

DEBT

The Company’s debt consists of the following (in millions):


	September 30, 2023
	Gross Amount		Debt Issuance Costs		Original Issue (Discount) or Premium		Net Amount
Short-term borrowings—trade receivable securitization facility	$	350	$	(1)	$	—	$	349
Term loans	$	6,249	$	(22)	$	(48)	$	6,179
6.25% secured notes due 2026 (“2026 Secured Notes”)	4,400		(25)		2		4,377
7.50% senior subordinated notes due 2027 (“7.50% 2027 Notes”)	550		(2)		—		548
5.50% senior subordinated notes due 2027 (“5.50% 2027 Notes”)	2,650		(12)		—		2,638
6.75% secured notes due 2028 (“2028 Secured Notes”)	2,100		(19)		(10)		2,071
4.625% senior subordinated notes due 2029 (“4.625% 2029 Notes”)	1,200		(7)		—		1,193
4.875% senior subordinated notes due 2029 (“4.875% 2029 Notes”)	750		(5)		—		745
6.875% secured notes due 2030 (“2030 Secured Notes”)	1,450		(14)		—		1,436
Government refundable advances	21		—		—		21
Finance lease obligations	193		—		—		193
	19,563		(106)		(56)		19,401
Less: current portion	71		—		—		71
Long-term debt	$	19,492	$	(106)	$	(56)	$	19,330


	September 30, 2022
	Gross Amount		Debt Issuance Costs		Original Issue (Discount) or Premium		Net Amount
Short-term borrowings—trade receivable securitization facility	$	350	$	—	$	—	$	350
Term loans	$	7,298	$	(29)	$	(13)	$	7,256
8.00% secured notes due 2025 (“2025 Secured Notes”)	1,100		(6)		—		1,094
6.375% senior subordinated notes due 2026 (“6.375% 2026 Notes”)	950		(4)		—		946
6.875% senior subordinated notes due 2026 (“6.875% 2026 Notes”)	500		(3)		(2)		495
2026 Secured Notes	4,400		(35)		3		4,368
7.50% 2027 Notes	550		(3)		—		547
5.50% 2027 Notes	2,650		(15)		—		2,635
4.625% 2029 Notes	1,200		(9)		—		1,191
4.875% 2029 Notes	750		(6)		—		744
Government refundable advances	23		—		—		23
Finance lease obligations	146		—		—		146
	19,567		(110)		(12)		19,445
Less: current portion	77		(1)		—		76
Long-term debt	$	19,490	$	(109)	$	(12)	$	19,369

Amendment No. 10, Loan Modification Agreement and Refinancing Facility Agreement – On December 14, 2022, the Company entered into Amendment No. 10, Loan Modification Agreement and Refinancing Facility Agreement (herein, “Amendment No. 10”) to the Second Amended and Restated Credit Agreement dated as of June 4, 2014 (the “Credit Agreement”). Under the terms of Amendment No. 10, the Company, among other things, repaid in full its existing approximately $1,725 million in Tranche G term loans maturing August 22, 2024 and replaced such loans with approximately $1,725 million in Tranche H term loans maturing February 22, 2027. The Tranche H term loans bear interest at Term SOFR plus 3.25% compared to the former Tranche G term loans which bore interest at LIBOR plus 2.25%. The Tranche H term loans were issued at a discount of 2.00%, or approximately $34.5 million. The Tranche H term loans were fully drawn on December 14, 2022 and the other terms and conditions that apply to the Tranche H term loans are substantially the same as the terms and conditions that applied to the term loans immediately prior to Amendment No. 10.

The Company expensed $4.6 million of refinancing costs associated with the refinancing during the fiscal year ended September 30, 2023. Additionally, the Company wrote-off $0.2 million in unamortized debt issuance costs and $0.1 million of original issue discount related to the Tranche G terms loans during the fiscal year ended September 30, 2023.

Amendment No. 11, Loan Modification Agreement and Refinancing Facility Agreement – On February 24, 2023, the Company entered into Amendment No. 11, Loan Modification Agreement and Refinancing Facility Agreement (herein, “Amendment No. 11”) to the Credit Agreement. Under the terms of Amendment No. 11, the Company, among other things, repaid in full its existing approximately $2,149 million in Tranche E term loans maturing May 30, 2025 and approximately $3,410 million in Tranche F term loans maturing December 9, 2025 and replaced such loans with approximately $4,559 million in Tranche I term loans maturing August 24, 2028 and the $1,000 million 2028 Secured Notes further described below. The Tranche I term loans bear interest at Term SOFR plus 3.25% compared to the former Tranche E and Tranche F term loans which bore interest at LIBOR plus 2.25%. The Tranche I term loans were issued at a discount of 0.25%, or approximately $11.4 million. The Tranche I term loans were fully drawn on February 24, 2023 and the other terms and conditions that apply to the Tranche I term loans are substantially the same as the terms and conditions that applied to the term loans immediately prior to Amendment No. 11.

The Company expensed $9.2 million of refinancing costs associated with the refinancing during the fiscal year ended September 30, 2023. Additionally, the Company wrote-off $0.1 million in unamortized debt issuance costs and $0.1 million of original issue discount related to the Tranche I terms loans during the fiscal year ended September 30, 2023.

Amendment No. 12 to the Second Amended and Restated Credit Agreement – On June 16, 2023, the Company entered into Amendment No. 12 to the Second Amended and Restated Credit Agreement (herein, “Amendment No. 12”). Under the terms of Amendment No. 12, the Company, among other things, removed the option to utilize LIBOR as a benchmark rate for any revolving loans and all future loans under the Credit Agreement and replaced such rate with Term SOFR for all dollar denominated loans and with Euro Interbank Offered Rate (“EURIBOR”) for all euro denominated revolving loans.

Issuance of $1,000 million Senior Secured Notes due 2028 – On February 24, 2023, the Company entered into a purchase agreement in connection with a private offering of $1,000 million in aggregate principal amount of 6.75% senior secured notes due 2028 (the “$1,000 million 2028 Secured Notes”) at an issue price of 100% of the principal amount. The $1,000 million 2028 Secured Notes were issued pursuant to an indenture, dated as of February 24, 2023, amongst TransDigm, as issuer, TransDigm Group, TransDigm UK and the other subsidiaries of TransDigm named therein, as guarantors. The $1,000 million 2028 Secured Notes are secured by a first-priority security interest in substantially all the assets of TransDigm, TransDigm Group, TransDigm UK and each other guarantor on an equal and ratable basis with any other existing and future senior secured debt, including indebtedness under the Company's senior secured credit facilities and 2026 Secured Notes. The net proceeds of the offering of the $1,000 million 2028 Secured Notes were used, along with the proceeds from the Tranche I term loans further described above, to repurchase the Tranche E and Tranche F term loans.

The $1,000 million 2028 Secured Notes bear interest at a rate of 6.75% per annum, which accrues from February 24, 2023 and is payable semiannually in arrears on February 15th and August 15th of each year, commencing on August 15, 2023. The $1,000 million 2028 Secured Notes mature on August 15, 2028, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the indenture.

The Company capitalized $9.8 million in debt issuance costs associated with the $1,000 million 2028 Secured Notes during the fiscal year ended September 30, 2023.

Issuance of $1,100 million Senior Secured Notes due 2028 – On March 9, 2023, the Company entered into a purchase agreement in connection with a private offering of $1,100 million in aggregate principal amount of 6.75% senior secured notes due 2028 (the “$1,100 million 2028 Secured Notes”) at an issue price of 99% of the principal amount, which represents an approximately $11.0 million discount. The $1,100 million 2028 Secured Notes are an additional issuance of the Company's existing $1,000 million 2028 Secured Notes (collectively, the “2028 Secured Notes”), and were issued under the indenture dated as of February 24, 2023 pursuant to which the Company previously issued $1,000 million 2028 Secured Notes and a supplemental indenture dated as of March 9, 2023. The $1,100 million 2028 Secured Notes are the same class and series as, and otherwise identical to, the $1,000 million 2028 Secured Notes other than with respect to the date of issuance and issue price.

The $1,100 million 2028 Secured Notes bear interest at a rate of 6.75% per annum, which accrues from February 24, 2023 and is payable semiannually in arrears on February 15th and August 15th of each year, commencing on August 15, 2023. The $1,100 million 2028 Secured Notes mature on August 15, 2028, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the indentures.

The Company capitalized $11.6 million in debt issuance costs associated with the $1,100 million 2028 Secured Notes during the fiscal year ended September 30, 2023.

Redemption of 8.00% Senior Secured Notes due 2025 – On April 10, 2023, the Company redeemed all $1,100 million aggregate principal amount of its outstanding 2025 Secured Notes at a redemption price of 102.00% of the principal amount thereof, plus accrued and unpaid interest thereon to, but not including, the redemption date, using the net proceeds of the offering of the $1,100 million 2028 Secured Notes, together with cash on hand. In connection with the redemption of the 2025 Secured Notes, the Company paid accrued interest of approximately $1.7 million and an early redemption premium of $22.0 million associated with the 2025 Secured Notes.

The Company recorded refinancing costs of $27.1 million, consisting primarily of the $22.0 million early redemption premium and the write-off of $4.8 million in unamortized debt issuance costs during the fiscal year ended September 30, 2023 in conjunction with the redemption of the 2025 Secured Notes.

Issuance of $1,450 million Senior Secured Notes due 2030 – On August 18, 2023, the Company entered into a purchase agreement in connection with a private offering of $1,450 million in aggregate principal amount of 6.875% senior secured notes due 2030 (the “2030 Secured Notes”) at an issue price of 100% of the principal amount. The 2030 Secured Notes were issued pursuant to an indenture, dated August 18, 2023, among TransDigm, Inc., as issuer, TransDigm Group and the subsidiaries of TransDigm, Inc. named therein, as guarantors. The 2030 Secured Notes are secured by a first-priority security interest in substantially all the assets of TransDigm, TransDigm Group and each other guarantor on an equal and ratable basis with any other existing and future senior secured debt, including indebtedness under the Company's senior secured credit facilities, 2026 Secured Notes and 2028 Secured Notes. The net proceeds of the offering of the 2030 Secured Notes, together with cash on hand, were used to redeem all of the outstanding 6.375% 2026 Notes and 6.875% 2026 Notes and to pay related premiums, fees and expenses.

The 2030 Secured Notes bear interest at a rate of 6.875% per annum, which accrues from August 18, 2023 and is payable semiannually in arrears on June 15th and December 15th of each year, commencing on December 15, 2023. The 2030 Secured Notes mature on December 15, 2030, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the indentures.

The Company capitalized $14.0 million in debt issuance costs associated with the 2030 Secured Notes during the fiscal year ended September 30, 2023.

Redemptions of 6.375% Senior Subordinated Notes due 2026 and 6.875% Senior Subordinated Notes due 2026 – On September 18, 2023, the Company redeemed all $950 million aggregate principal amount of its outstanding 6.375% 2026 Notes at a redemption price of 100.00% of the principal thereof, plus accrued and unpaid interest thereon to, but not including, the redemption date, using a portion of the net proceeds of the offering of the 2030 Secured Notes, together with cash on hand. In connection with the redemption of the 6.375% 2026 Notes, the Company paid accrued interest of approximately $15.5 million. There was no early redemption premium.

Also, on September 18, 2023, the Company redeemed all $500 million aggregate principal amount of its outstanding 6.875% 2026 Notes at a redemption price of 101.719% of the principal amount thereof, plus accrued and unpaid interest thereon to, but not including, the redemption date, using a portion of the net proceeds of the offering of the 2030 Secured Notes, together with cash on hand. In connection with the redemption of the 6.875% 2026 Notes, the Company paid accrued interest of approximately $11.7 million and an early redemption premium of $8.6 million associated with the 6.875% 2026 Notes.

The Company recorded refinancing costs of $15.0 million, consisting primarily of the $8.6 million early redemption premium associated with the 6.875% 2026 Notes, and the write-off of unamortized debt issuance costs of $5.1 million and original issuance discount of $1.3 million for the fiscal year ended September 30, 2023 in conjunction with the redemption of the 6.375% 2026 Notes and 6.875% 2026 Notes.

Trade Receivable Securitization Facility

The Company’s trade receivable securitization facility (the “Securitization Facility”) effectively increases the Company’s borrowing capacity depending on the amount of the domestic operations’ trade accounts receivable. The Securitization Facility includes the right for the Company to exercise annual one year extensions as long as there have been no termination events as defined by the agreement. The Company uses the proceeds from the Securitization Facility as an alternative to other forms of debt, effectively reducing borrowing costs.

On July 25, 2023, the Company amended the Securitization Facility to, among other things, increase the borrowing capacity from $350 million to $450 million and extend the maturity date to July 25, 2024 at an interest rate of three-month Term SOFR plus 1.60%, compared to an interest rate of three-month Term SOFR plus 1.30% that applied prior to the amendment. The total drawn on the Securitization Facility remains at $350 million as of September 30, 2023. The weighted average interest rate on the $350 million of borrowings under our Securitization Facility on September 30, 2023 and 2022 was 6.8% and 3.8%, respectively. The Securitization Facility is collateralized by substantially all of the Company's domestic operations' trade accounts receivable.

Government Refundable Advances

Government refundable advances consist of payments received from the Canadian government to assist in research and development related to commercial aviation. The requirement to repay this advance is based on year-over-year commercial aviation revenue growth for certain product lines at CMC Electronics, which is a wholly-owned subsidiary of TransDigm. As of September 30, 2023 and 2022, the outstanding balance of these advances were $21 million and $23 million, respectively.

Obligations under Finance Leases

The Company leases certain buildings and equipment under finance leases. The present value of the minimum finance lease payments, net of the current portion, represents a balance of $193 million and $146 million at September 30, 2023 and 2022, respectively. The increase in fiscal 2023 is attributable to certain lease renewals and amendments qualifying as lease modifications resulting in a change in classification from an operating lease to a finance lease. Refer to Note 19, “Leases,” for further disclosure of the Company’s lease obligations.

Senior Secured Term Loans Facility


Term Loans Facility	Maturity Date	Interest Rate	Aggregate Principal as of September 30,
			2023		2022
Tranche H	February 22, 2027	Term SOFR plus 3.25%	$	1,713	$	—
Tranche I	August 24, 2028	Term SOFR plus 3.25%	$	4,536	$	—
Tranche E (1)	May 30, 2025	LIBOR plus 2.25%	$	—	$	2,155
Tranche F (1)	December 9, 2025	LIBOR plus 2.25%	$	—	$	3,418
Tranche G (1)	August 22, 2024	LIBOR plus 2.25%	$	—	$	1,725

(1)As previously disclosed within this note, during fiscal 2023, Tranches E, F and G were replaced by Tranches H and I.

The interest rates per annum applicable to the loans under the Credit Agreement are, at TransDigm’s option, equal to either an alternate base rate or an adjusted Term SOFR for one, three or six-months thereafter (in each case, subject to the availability thereof), interest periods chosen by TransDigm, in each case plus an applicable margin percentage. The adjusted Term SOFR related to Tranche H and Tranche I term loans are not subject to a floor. At September 30, 2023 and 2022, the applicable interest rates for all existing tranches (which excludes the impact of our interest rate swaps, caps and collars) were 8.49% and 5.92%, respectively, with the increase due to the change from LIBOR plus 2.25% to Term SOFR plus 3.25% during fiscal 2023 after the refinancing of the term loans facility. Refer to Note 21, “Derivatives and Hedging Activities,” for information about how our interest rate swaps, cap and collar agreements are used to hedge and offset, respectively, the variable interest rates on the credit facility.

Refinancing Costs

During the fiscal year ended September 30, 2023 the Company expensed refinancing costs of $56 million, primarily representing the early redemption premium paid in connection with the repurchase of the $1,100 million 2025 Secured Notes, the redemptions of the $950 million 6.375% 2026 Notes and $500 million 6.875% 2026 Notes, and also from the execution of Amendments No. 10 and No. 11 to the Credit Agreement during the fiscal year ended September 30, 2023.

Secured Notes

TransDigm Inc.’s 2026 Secured Notes and 2028 Secured Notes are jointly and severally guaranteed, on a senior basis, by TD Group, TransDigm UK and all of TransDigm Inc.'s Domestic Restricted Subsidiaries, as defined in the applicable indentures. The 2030 Secured Notes (collectively with the 2026 Secured Notes and the 2028 Secured Notes, the “Secured Notes”) are guaranteed on a senior secured basis by TD Group and each of TransDigm Inc.’s direct and indirect Restricted Subsidiaries (as defined in the applicable indenture) that is a borrower or guarantor under TransDigm’s senior secured credit facilities or that issues or guarantees any capital market indebtedness of TransDigm Inc. or any of the guarantors in an aggregate principal amount of at least $200 million. As of the date of this Form 10-K, the guarantors of the 2030 Secured Notes are the same as the guarantors of the 2026 Secured Notes and the 2028 Secured Notes. The Secured Notes contain restrictive covenants that are substantially similar to many of the restrictive covenants included in the Credit Agreement. TransDigm is in compliance with all the covenants contained in the Secured Notes.

Subordinated Notes

TransDigm Inc.'s 7.50% 2027 Notes, 5.50% 2027 Notes, 4.625% 2029 Notes, and 4.875% 2029 Notes (collectively, the “Subordinated Notes”) are jointly and severally guaranteed, on a senior subordinated basis, by TD Group, TransDigm UK and all of TransDigm Inc.'s Domestic Restricted Subsidiaries, as defined in the applicable indentures. The Subordinated Notes contain restrictive covenants that are substantially similar to many of the restrictive covenants included in the Credit Agreement. TransDigm is in compliance with all the covenants contained in the Subordinated Notes.

Debt Repayment Schedule

At September 30, 2023, future maturities of long-term debt (excluding finance leases) are as follows (in millions), refer to Note 19, “Leases,” for future maturities of finance leases:


Fiscal Years Ended September 30,
2024	$	66
2025	66
2026	4,466
2027	2,260
2028	9,108
Thereafter	3,404
Total	$	19,370

- Definition

The entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
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-Name Accounting Standards Codification
-Section 50
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-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1B

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
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+ Details

TRADE ACCOUNTS RECEIVABLE - Content Trade Accounts Receivable (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Receivables [Abstract]
Trade accounts receivable—gross	$ 1,261	$ 1,002
Allowance for uncollectible accounts	(31)	(35)
Trade accounts receivable—Net	$ 1,230	$ 967

DERIVATIVES AND HEDGING ACTIVITIES (Tables)

12 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block]

The tables below summarize the key terms of the swaps, cap and collars as of September 30, 2023 (aggregated by effective date).

Interest rate swap agreements:

Aggregate Notional Amount (in millions)

Effective Date

Maturity Date

Conversion of Related Variable Rate Debt subject to Term SOFR to Fixed Rate of:

$400

3/31/2023

6/28/2024

6.25% (3.0% plus the 3.25% margin percentage)

$900

3/31/2023

6/28/2024

6.35% (3.1% plus the 3.25% margin percentage)

$500

3/31/2023

3/31/2025

6.25% (3.0% plus the 3.25% margin percentage)

$1,500

3/31/2023

3/31/2025

6.35% (3.1% plus the 3.25% margin percentage)

$700

3/31/2023

9/30/2025

4.55% (1.3% plus the 3.25% margin percentage)

Interest rate cap agreement:

Aggregate Notional Amount (in millions)

Effective Date

Maturity Date

Offsets Variable Rate Debt Attributable to Fluctuations Above:

$700

3/31/2023

9/30/2025

Three-month Term SOFR rate of 1.25%

Interest rate collar agreements:

Aggregate Notional Amount (in millions)

Effective Date

Maturity Date

Offsets Variable Rate Debt Attributable to Fluctuations Below and Above:

$1,100

3/31/2025

9/30/2026

Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap)

$500

9/30/2025

9/30/2026

Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap)

Schedule of Interest Rate Derivatives


	September 30, 2023				September 30, 2022
	Asset		Liability		Asset		Liability
Interest rate cap agreement	$	53	$	1	$	50	$	—
Interest rate collar agreements	17		—		—		—
Interest rate swap agreements	144		3		145		—


Net derivatives as classified in the consolidated balance sheets (1)	$	214	$	4	$	195	$	—

(1)Refer to Note 20, “Fair Value Measurements,” for the consolidated balance sheets classification of the Company’s interest rate swap, cap and collar agreements.

INCOME TAXES

12 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

INCOME TAXES

The Company’s income from continuing operations before income taxes includes the following components for the periods shown below (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
United States	$	1,413	$	882	$	516
Foreign	303		245		199
	$	1,716	$	1,127	$	715

The Company’s income tax provision (benefit) on income from continuing operations consists of the following for the periods shown below (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Current
Federal	$	276	$	194	$	(21)
State	41		27		14
Foreign	97		62		7
	414		283		—
Deferred
Federal	28		(17)		7
State	11		(8)		(2)
Foreign	(36)		3		29
	3		(22)		34
	$	417	$	261	$	34

A reconciliation of the federal statutory income tax rate to the effective income tax rate for the periods shown below is as follows:


	Fiscal Years Ended September 30,
	2023		2022		2021
Federal statutory income tax rate	21.0	%	21.0	%	21.0	%
Changes in valuation allowances impacting results (1)	5.3	%	5.5	%	(8.2)	%
State and local income taxes, net of federal benefit	1.7	%	0.1	%	0.4	%
Provision to return adjustments	0.3	%	(1.0)	%	2.2	%
Federal deemed inclusion amounts	0.3	%	1.5	%	1.7	%
Resolution and settlements to uncertain tax positions	0.3	%	(0.1)	%	(3.2)	%
Withholding taxes	0.2	%	1.2	%	0.2	%
Research and development credits	(0.4)	%	(0.6)	%	(1.2)	%
Foreign tax credits	(0.5)	%	(0.8)	%	(1.2)	%
Foreign-derived intangible income	(1.2)	%	(2.0)	%	(1.5)	%
Stock-based compensation	(2.3)	%	(2.8)	%	(8.7)	%
Gain on sale of businesses	—	%	(0.1)	%	1.4	%
Remeasurement of deferred tax assets and liabilities related to enacted statutory rate changes	—	%	—	%	2.1	%
Other—net	(0.4)	%	1.3	%	(0.2)	%
Effective income tax rate	24.3	%	23.2	%	4.8	%

(1) Primarily relates to the Company’s business interest expense limitation pursuant to IRC §163(j) as modified by the Tax Cuts and Jobs Act. Such provision, as modified, was effective for the Company beginning in fiscal 2019. In general, the deduction for interest expense is limited to 30% (50% as modified by the CARES Act for the Company’s fiscal 2021) of the sum of the Company’s adjusted taxable income (“ATI”) and its business interest income. Interest expense disallowed by such limitation, in a taxable year, may be carried forward indefinitely. Based upon available evidence, a valuation allowance is recorded for the resulting carryforward to reflect the Company’s belief that it is more likely than not that such deferred tax assets will not be realized. In fiscal 2021, the Company made a tax election on its U.S. federal income tax return allowing for the utilization of its net interest limitation carryforward. The Company recognized approximately $69.0 million of benefit from the release of the valuation allowance, applicable to such carryforward, for the fiscal year ended September 30, 2021.

The components of the deferred taxes consist of the following (in millions):


	September 30, 2023		September 30, 2022
Deferred tax assets (liabilities):
Intangible assets	$	(852)	$	(832)
Property, plant and equipment	(82)		(23)
Interest rate swaps and caps	(47)		(42)
Interest expense limitation	190		87
Employee benefits	103		108
Inventories	89		61
Net operating losses	66		52
Capitalized research and development costs	52		24
Loss contract reserves	36		41
U.S. income tax credits	25		27
Environmental reserves	10		11
Non-U.S. income tax credits	9		14
Product warranty reserves	6		6
Other	(5)		7
Total	(400)		(459)
Add: Valuation allowance	(227)		(137)
Total net deferred tax assets (liabilities)	$	(627)	$	(596)

At September 30, 2023, the Company has state net operating loss carryforwards of approximately $905.5 million, German net operating loss carryforwards of $39.5 million and United Kingdom net operating loss carryforwards of approximately $117.2 million that expire in various fiscal years from 2024 to 2042. The Company has U.S. and non-U.S. tax credit carryforwards of $33.7 million that expire beginning in fiscal year 2024.

The deferred tax assets for the interest expense limitation, net operating losses, and tax credit carryforwards are reduced by a valuation allowance for the amount of such assets that the Company believes will not be realized.

With limited exception, no provision has been made for income taxes on undistributed earnings of foreign subsidiaries of approximately, $166.0 million at September 30, 2023, since it is the Company’s intention to indefinitely reinvest such undistributed earnings. The cash that is permanently reinvested is typically used to expand operations either organically or through acquisitions. It is not practicable to estimate the additional taxes that would be payable on the remittance of such earnings. We have provided for taxes in jurisdictions in which we are not considered indefinitely reinvested, however, such amounts are not significant.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state, local and foreign jurisdictions. The Company is no longer subject to U.S. federal examinations for years before fiscal 2018. The Company is currently under examination for its federal income taxes in Canada for fiscal years 2013 through 2019, in France for fiscal years 2020 through 2022, and in Germany for fiscal years 2014 through 2019. In addition, the Company is subject to state income tax examinations for fiscal years 2015 and later.

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):


	2023		2022
Balance at October 1	$	17	$	19

Additions based on tax positions related to the prior year	4		3
Additions based on tax positions related to the current year	—		—
Reductions based on tax positions related to the prior year	—		(1)
Settlement with tax authorities	(3)		(1)
Lapse in statute of limitations	(1)		(3)
Balance at September 30	$	17	$	17

Unrecognized tax benefits at September 30, 2023 and 2022, the recognition of which would have an effect on the effective tax rate for each fiscal year, amounted to $16.9 million and $16.6 million, respectively. The Company classifies all income tax-related interest and penalties as income tax expense, which were not significant for the years ended September 30, 2023 and 2022. As of September 30, 2023 and 2022, the Company accrued $5.6 million and $4.5 million, respectively, for the potential payment of interest and penalties. Within the next 12 months, it is reasonably possible that unrecognized tax benefits could be reduced by approximately $6.1 million resulting from the resolution or closure of tax examinations. Any increase in the amount of unrecognized tax benefits within the next 12 months is not expected to be material.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
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+ Details

DERIVATIVES AND HEDGING ACTIVITIES

12 Months Ended

Sep. 30, 2023

Derivative Instruments and Hedging Activities Disclosure [Abstract]

DERIVATIVES AND HEDGING ACTIVITIES

The Company is exposed to, among other things, the impact of changes in foreign currency exchange rates and interest rates in the normal course of business. The Company’s risk management program is designed to manage the exposure and volatility arising from these risks, and utilizes derivative financial instruments to offset a portion of these risks. The Company uses derivative financial instruments only to the extent necessary to hedge identified business risks and does not enter into such transactions for trading purposes. The Company generally does not require collateral or other security with counterparties to these financial instruments and is therefore subject to credit risk in the event of nonperformance; however, the Company monitors credit risk and currently does not anticipate nonperformance by other parties. These derivative financial instruments do not subject the Company to undue risk, as gains and losses on these instruments generally offset gains and losses on the underlying assets, liabilities, or anticipated transactions that are being hedged. The Company has agreements with each of its swap, cap and collar counterparties that contain a provision whereby if the Company defaults on the Credit Agreement, the Company could also be declared in default on its swaps, cap and collars resulting in an acceleration of payment under the swaps, cap and collars.

All derivative financial instruments are recorded at fair value in the consolidated balance sheets. For a derivative that has not been designated as an accounting hedge, the change in the fair value is recognized immediately through earnings. For a derivative that has been designated as an accounting hedge of an existing asset or liability (a fair value hedge), the change in the fair value of both the derivative and underlying asset or liability is recognized immediately through earnings. For a derivative designated as an accounting hedge of an anticipated transaction (a cash flow hedge), the change in the fair value is recorded on the consolidated balance sheets in accumulated other comprehensive loss to the extent the derivative is effective in mitigating the exposure related to the anticipated transaction. The change in the fair value related to the ineffective portion of the hedge, if any, is immediately recognized in earnings. The amount recorded within accumulated other comprehensive loss is reclassified into earnings in the same period during which the underlying hedged transaction affects earnings.

Interest Rate Swap, Cap and Collar Agreements – Interest rate swap, cap and collar agreements are used to manage interest rate risk associated with floating rate borrowings (such as our term loans - see Note 12, “Debt”) under our Credit Agreement. These agreements involve the receipt of floating rate amounts in exchange for fixed rate interest payments over the term of the agreements without an exchange of the underlying principal amount. The agreements utilized by the Company effectively modify the Company’s exposure to interest rate risk by converting a portion of the Company’s floating rate debt to a fixed rate basis from the effective date through the maturity date of the respective interest rate swap, cap and collar agreements, thereby reducing the impact of interest rate movements on future interest expense.

Prior to amending the Credit Agreement (as disclosed in Note 12, “Debt”), the Company was exposed to floating rates of LIBOR via the term loans' benchmark interest rate. During the second quarter of fiscal 2023, in connection with the amendment of the Credit Agreement impacting the term loans, we entered into LIBOR to Term SOFR basis interest rate swap and cap transactions to effectively convert our existing swaps and cap from LIBOR-based to Term SOFR-based. The basis swaps and cap offset the LIBOR exposure of the existing swaps and cap and effectively fix the Term SOFR rate for the notional amount.

We also entered into forward starting interest rate collar agreements during the second quarter of fiscal 2023. The interest rate collar agreements establish a range where we will pay the counterparties if the three-month Term SOFR rate falls below the established floor rate of 2.0%, and the counterparties will pay us if the three-month Term SOFR rate exceeds the ceiling rate of 3.5%. The collar will settle quarterly from the effective date through the maturity date. No payments or receipts will be exchanged on the interest rate collar contracts unless interest rates rise above or fall below the contracted ceiling or floor rates.

The tables below summarize the key terms of the swaps, cap and collars as of September 30, 2023 (aggregated by effective date).

Interest rate swap agreements:

Aggregate Notional Amount (in millions)

Effective Date

Maturity Date

Conversion of Related Variable Rate Debt subject to Term SOFR to Fixed Rate of:

$400

3/31/2023

6/28/2024

6.25% (3.0% plus the 3.25% margin percentage)

$900

3/31/2023

6/28/2024

6.35% (3.1% plus the 3.25% margin percentage)

$500

3/31/2023

3/31/2025

6.25% (3.0% plus the 3.25% margin percentage)

$1,500

3/31/2023

3/31/2025

6.35% (3.1% plus the 3.25% margin percentage)

$700

3/31/2023

9/30/2025

4.55% (1.3% plus the 3.25% margin percentage)

Interest rate cap agreement:

Aggregate Notional Amount (in millions)

Effective Date

Maturity Date

Offsets Variable Rate Debt Attributable to Fluctuations Above:

$700

3/31/2023

9/30/2025

Three-month Term SOFR rate of 1.25%

Interest rate collar agreements:

Aggregate Notional Amount (in millions)

Effective Date

Maturity Date

Offsets Variable Rate Debt Attributable to Fluctuations Below and Above:

$1,100

3/31/2025

9/30/2026

Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap)

$500

9/30/2025

9/30/2026

Three-month Term SOFR rate of 2.00% (floor) and 3.50% (cap)

These derivative instruments qualify as effective cash flow hedges under U.S. GAAP. For the LIBOR to Term SOFR basis interest rate swap and cap agreements referenced above, we applied the practical expedients permissible under ASC 848 to continue hedge accounting for our existing swaps and cap as effective cash flow hedges. For our cash flow hedges, the effective portion of the gain or loss from the financial instruments is initially reported as a component of accumulated other comprehensive loss in stockholders’ deficit and subsequently reclassified into earnings in the same line as the hedged item in the same period or periods during which the hedged item affects earnings. As the interest rate swap, cap and collar agreements are used to manage interest rate risk, any gains or losses from the derivative instruments that are reclassified into earnings are recognized in interest expense-net in the consolidated statements of income. Cash flows related to the derivative contracts are included in cash flows from operating activities on the consolidated statements of cash flows.

Certain derivative asset and liability balances are offset where master netting agreements provide for the legal right of setoff. For classification purposes, we record the net fair value of each type of derivative position that is expected to settle in less than one year with each counterparty as a net current asset or liability and each type of long-term position as a net non-current asset or liability. The amounts shown in the table below represent the gross amounts of recognized assets and liabilities, the amounts offset in the consolidated balance sheets and the net amounts of assets and liabilities presented therein (in millions):


	September 30, 2023				September 30, 2022
	Asset		Liability		Asset		Liability
Interest rate cap agreement	$	53	$	1	$	50	$	—
Interest rate collar agreements	17		—		—		—
Interest rate swap agreements	144		3		145		—


Net derivatives as classified in the consolidated balance sheets (1)	$	214	$	4	$	195	$	—

(1)Refer to Note 20, “Fair Value Measurements,” for the consolidated balance sheets classification of the Company’s interest rate swap, cap and collar agreements.

Based on the fair value amounts determined as of September 30, 2023, the estimated net amount of existing (gains) losses and caplet amortization expected to be reclassified into interest expense-net within the next 12 months is approximately $(100) million.

Foreign Currency Forward Exchange Contracts – The Company transacts business in various foreign currencies, which subjects the Company’s cash flows and earnings to exposure related to changes in foreign currency exchange rates. These exposures arise primarily from purchases or sales of products and services from third parties. Foreign currency forward exchange contracts provide for the purchase or sale of foreign currencies at specified future dates at specified exchange rates, and are used to offset changes in the fair value of certain assets or liabilities or forecasted cash flows resulting from transactions denominated in foreign currencies. At September 30, 2023, the Company has outstanding foreign currency forward exchange contracts to sell U.S. dollars with notional amounts of $163 million. The maximum duration of the Company’s foreign currency cash flow hedge contracts at September 30, 2023 is 12 months. These notional values consist of contracts for the Canadian dollar and the euro and are stated in U.S. dollar equivalents at spot exchange rates at the respective trade dates. Amounts related to foreign currency forward exchange contracts included in accumulated other comprehensive loss in stockholders' deficit are reclassified into net sales when the hedged transaction settles.

During the fiscal year ended September 30, 2023, the losses reclassified on settlements of foreign currency forward exchange contracts designated as cash flow hedges into net sales was approximately $3 million. The losses were previously recorded as a component of accumulated other comprehensive loss in stockholders' deficit.

As of September 30, 2023, the Company expects to record a net loss of approximately $5 million on foreign currency forward exchange contracts designated as cash flow hedges to net sales over the next 12 months

DEBT - Schedule of Debt (Detail) - USD ($) $ in Millions	12 Months Ended
DEBT - Schedule of Debt (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Debt Issuance Costs, Net	$ (106.0)	$ (110.0)
Debt Instrument, Unamortized Discount (Premium), Net	56.0	12.0
Short-term borrowings—trade receivable securitization facility	349.0	350.0
Long-term Debt, Gross	19,563.0	19,567.0
Long-term Debt	19,401.0	19,445.0
Less current portion	71.0	76.0
Deferred Finance Costs, Excluding Current Maturities	(106.0)	(109.0)
Debt Instrument, Unamortized Discount, Excluding Current Maturities	(56.0)	(12.0)
Long-term Debt, Gross and Lease Obligation	19,492.0	19,490.0
LONG-TERM DEBT	19,330.0	19,369.0
REFINANCING COSTS	$ 56.0	$ 1.0	$ 37.0
Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	8.49%	5.92%
Debt Issuance Costs, Net	$ (22.0)	$ (29.0)
Debt Instrument, Unamortized Discount (Premium), Net	48.0	13.0
Long-term Debt, Gross	6,249.0	7,298.0
Long-term Debt	6,179.0	7,256.0
Government Refundable Advances [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	0.0	0.0
Debt Instrument, Unamortized Discount (Premium), Net	0.0	0.0
Long-term Debt	21.0	23.0
Government refundable advances	21.0	23.0
Finance Lease Obligations
Debt Instrument [Line Items]
Debt Issuance Costs, Net	0.0	0.0
Debt Instrument, Unamortized Discount (Premium), Net	0.0	0.0
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity	759.0	779.0
Asset-backed Securities [Member]
Debt Instrument [Line Items]
Short-term Bank Loans and Notes Payable, Gross	350.0	350.0
Debt Issuance Costs, Net	(1.0)	0.0
Debt Instrument, Unamortized Discount (Premium), Net	0.0	0.0
Short-term borrowings—trade receivable securitization facility	$ 349.0	350.0
Senior Secured Notes $1,100M due 2025 8.00% \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net		(6.0)
Debt Instrument, Unamortized Discount (Premium), Net		0.0
Long-term Debt, Gross		1,100.0
Debt Instrument, Interest Rate, Stated Percentage	8.00%
Long-term Debt	$ 0.0	1,094.0
Senior Subordinated Notes $950M due 2026 6.375% \| Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net		(4.0)
Debt Instrument, Unamortized Discount (Premium), Net		0.0
Long-term Debt, Gross		950.0
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Long-term Debt	$ 0.0	946.0
Senior Subordinated Notes $500M due 2026 6.875% \| Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net		(3.0)
Debt Instrument, Unamortized Discount (Premium), Net		2.0
Long-term Debt, Gross		500.0
Debt Instrument, Interest Rate, Stated Percentage	6.875%
Long-term Debt	$ 0.0	495.0
Senior Secured Notes $4,400M due 2026 6.25% \| Secured Debt [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	(25.0)	(35.0)
Debt Instrument, Unamortized Discount (Premium), Net	(2.0)	(3.0)
Long-term Debt, Gross	$ 4,400.0	4,400.0
Debt Instrument, Interest Rate, Stated Percentage	6.25%
Long-term Debt	$ 4,377.0	4,368.0
Senior Subordinated Notes $550M due 2027 7.50% \| Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	(2.0)	(3.0)
Debt Instrument, Unamortized Discount (Premium), Net	0.0	0.0
Long-term Debt, Gross	$ 550.0	550.0
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Long-term Debt	$ 548.0	547.0
Senior Subordinated Notes $2,650M due 2027 5.50% \| Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	(12.0)	(15.0)
Debt Instrument, Unamortized Discount (Premium), Net	0.0	0.0
Long-term Debt, Gross	$ 2,650.0	2,650.0
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Long-term Debt	$ 2,638.0	2,635.0
Senior Subordinated Notes $1,200M due 2029 4.625% \| Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	(7.0)	(9.0)
Debt Instrument, Unamortized Discount (Premium), Net	0.0	0.0
Long-term Debt, Gross	$ 1,200.0	1,200.0
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Long-term Debt	$ 1,193.0	1,191.0
Senior Subordinated Notes $750M due 2029 4.875% \| Senior Subordinated Notes [Member]
Debt Instrument [Line Items]
Debt Issuance Costs, Net	(5.0)	(6.0)
Debt Instrument, Unamortized Discount (Premium), Net	0.0	0.0
Long-term Debt, Gross	$ 750.0	750.0
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Long-term Debt	$ 745.0	$ 744.0

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Summary Of Significant Accounting Policies [Line Items]
Research and development expense	$ 105.0	$ 95.0	$ 106.0
Realized Gain (Loss), Foreign Currency Transaction, after Tax	$ 14.0	$ (40.0)	$ 11.0
Land Improvements \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Land Improvements \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Building and improvements \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Building and improvements \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	30 years
Machinery and equipment \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
Machinery and equipment \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Furniture and Fixtures \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Furniture and Fixtures \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Technology Intangible Assets \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years
Technology Intangible Assets \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	22 years
Order Backlog \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	1 year
Order Backlog \| Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	1 year 6 months
Customer Relationships \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years
Other Intangible Assets \| Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years

COMMITMENTS AND CONTINGENCIES (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Recommended Voluntary Refund	$ 21.0
Accrued Environmental Loss Contingencies, Current	3.0	$ 8.0
Accrued Environmental Loss Contingencies, Noncurrent	41.0	38.0
Insurance deductible			$ 1.0
Unusual or Infrequent Item, or Both, Insurance Proceeds			88.0
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds	0.0	0.0	24.0
Proceeds from Insurance Premiums Collected			58.0
Proceeds from Insurance Settlement, Operating Activities			34.0
Business Interruption Loss [Line Items]
Gain on insurance proceeds from fire	$ 0.0	$ 0.0	(24.0)
Proceeds from Insurance Settlement, Operating Activities			34.0
Environmental Loss Contingency, Noncurrent, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT LIABILITIES	OTHER NON-CURRENT LIABILITIES
Proceeds from Insurance Settlement, Investing Activities	$ 0.0	$ 0.0	24.0
Environmental Loss Contingency, Current, Statement of Financial Position [Extensible Enumeration]	Accrued and other current liabilities	Accrued and other current liabilities
Insurance Claims
Commitments and Contingencies Disclosure [Abstract]
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds			19.0
Business Interruption Loss [Line Items]
Gain on insurance proceeds from fire			(19.0)
Corporate and Other
Commitments and Contingencies Disclosure [Abstract]
Unusual or Infrequent Item, or Both, Net of Insurance Proceeds			5.0
Business Interruption Loss [Line Items]
Gain on insurance proceeds from fire			$ (5.0)

ACQUISITIONS AND DIVESTITURES - Subsequent Event (Details) - Electron Device business of Communications & Power Industries - Subsequent Event $ in Millions	Nov. 09, 2023 USD ($)
Business Combination and Asset Acquisition [Abstract]
Payments to Acquire Businesses, Gross	$ 1,385
Business Acquisition [Line Items]
Payments to Acquire Businesses, Gross	$ 1,385

INTANGIBLE ASSETS

12 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

Other intangible assets-net in the consolidated balance sheets consist of the following at September 30 (in millions):


	2023						2022
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Trademarks and trade names	$	1,019	$	—	$	1,019	$	990	$	—	$	990
Technology	2,124		888		1,236		2,054		780		1,274
Order backlog	7		6		1		7		3		4
Customer relationships	623		136		487		580		104		476
Other	9		5		4		9		3		6
Total	$	3,782	$	1,035	$	2,747	$	3,640	$	890	$	2,750

As disclosed in Note 2, “Acquisitions and Divestitures,” the estimated fair value of the net identifiable tangible and intangible assets acquired is based on the acquisition method of accounting and is subject to adjustment upon completion of the third-party valuation for the Calspan acquisition. Material adjustments may occur. The fair value of the net identifiable tangible and intangible assets acquired will be finalized within the measurement period (not to exceed one year). Intangible assets acquired during the fiscal year ended September 30, 2023 are summarized in the table below (in millions):


	Gross Amount		Amortization Period
Intangible assets not subject to amortization:
Goodwill	$	256
Trademarks and trade names	20
	276
Intangible assets subject to amortization:
Technology	47		20 years
Customer relationships	31		20 years
	78
Total	$	354

Information regarding the amortization expense of amortizable intangible assets is detailed below (in millions):

Annual Amortization Expense:


Fiscal Years Ended September 30,
2023	$	139
2022	136
2021	137

Estimated Amortization Expense:


Fiscal Years Ended September 30,
2024	$	138
2025	138
2026	135
2027	134
2028	134

The following is a summary of changes in the carrying value of goodwill by segment for the fiscal years ended September 30, 2022 and 2023 (in millions):


	Power & Control		Airframe		Non-aviation		Total
Balance at September 30, 2021	$	4,149	$	4,326	$	93	$	8,568
Goodwill acquired during the period (Note 2)	57		202		—		259
Purchase price allocation adjustments (1)	—		3		—		3
Currency translation adjustments and other	(51)		(138)		—		(189)
Balance at September 30, 2022	4,155		4,393		93		8,641
Goodwill acquired during the period (Note 2)	12		244		—		256
Purchase price allocation adjustments (2)	4		3		—		7
Currency translation adjustments and other	23		61		—		84
Balance at September 30, 2023	$	4,194	$	4,701	$	93	$	8,988

(1)Primarily related to opening balance sheet adjustments recorded from the acquisition of CAC completed during fiscal year 2021, up to the expiration of the measurement period (not to exceed one year). Refer to Note 2, “Acquisitions and Divestitures,” for further information.

(2)Primarily related to opening balance sheet adjustments recorded from the series of acquisitions completed during fiscal year 2022 by the Company's Extant Aerospace subsidiary (Power & Control) and the acquisition of DART (Airframe). Refer to Note 2, “Acquisitions and Divestitures,” for further information.

STOCK-BASED COMPENSATION - Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity (Detail)	12 Months Ended
	Sep. 30, 2023 USD ($) $ / shares shares
2019 Stock Option Plan
Number of Options
Number of Options, Granted	3,776,055
2019 Stock Option Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	0
Number of Options, Granted	223,945
Number of Options, Exercised	0
Number of Options, Forfeited	0
Number of Options, Expired	0
Number of Options, Outstanding, end of period	223,945
Number of Options, Expected to vest	85,948
Number of Options Exercisable at end of period	41,269
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 0
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	627.81
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	0
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	0
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	627.81
Weighted-Average Exercise Price Per Option, Expected to vest \| $ / shares	627.36
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 631.65
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	9 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	9 years 2 months 12 days
Weighted-Average Remaining Contractual Term, Exercisable, years	9 years 3 months 18 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 48,220,048
Aggregate Intrinsic Value, Expected to vest \| $	18,545,000
Aggregate Intrinsic Value, Exercisable \| $	$ 8,727,648
2014 Stock Option Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	4,302,706
Number of Options, Granted	374,965
Number of Options, Exercised	(312,555)
Number of Options, Forfeited	(117,875)
Number of Options, Expired	(920)
Number of Options, Outstanding, end of period	4,246,321
Number of Options, Expected to vest	934,190
Number of Options Exercisable at end of period	3,065,412
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 424.54
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	598.84
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	323.15
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	580.76
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	610.00
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	443.02
Weighted-Average Exercise Price Per Option, Expected to vest \| $ / shares	591.97
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 385.97
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	5 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	7 years 10 months 24 days
Weighted-Average Remaining Contractual Term, Exercisable, years	5 years 1 month 6 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 1,698,993,209
Aggregate Intrinsic Value, Expected to vest \| $	234,631,160
Aggregate Intrinsic Value, Exercisable \| $	$ 1,401,378,878
2006 Stock Incentive Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	1,082,985
Number of Options, Granted	0
Number of Options, Exercised	(632,793)
Number of Options, Forfeited	0
Number of Options, Expired	0
Number of Options, Outstanding, end of period	450,192
Number of Options Exercisable at end of period	450,192
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period \| $ / shares	$ 193.05
Weighted-Average Exercise Price Per Option, Granted \| $ / shares	0
Weighted-Average Exercise Price Per Option, Exercised \| $ / shares	179.93
Weighted-Average Exercise Price Per Option, Forfeited \| $ / shares	0
Weighted-Average Exercise Price Per Option, Expired \| $ / shares	0
Weighted-Average Exercise Price Per Option, Outstanding, end of period \| $ / shares	211.49
Weighted-Average Exercise Price Per Option, Exercisable \| $ / shares	$ 211.49
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	1 year 9 months 18 days
Weighted-Average Remaining Contractual Term, Exercisable, years	1 year 9 months 18 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding \| $	$ 284,357,481
Aggregate Intrinsic Value, Exercisable \| $	$ 284,357,481

DEBT - Narratives (Detail) - USD ($)						12 Months Ended
DEBT - Narratives (Detail) - USD ($)	Sep. 18, 2023	Aug. 18, 2023	Apr. 10, 2023	Mar. 09, 2023	Feb. 24, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Jul. 25, 2023	Dec. 14, 2022	Dec. 29, 2021
Debt Instrument [Line Items]
Debt instrument, face amount						$ 19,370,000,000
Refinancing costs						56,000,000	$ 1,000,000	$ 37,000,000
Long-term Debt, Gross						19,563,000,000	19,567,000,000
Debt Issuance Costs, Net						(106,000,000)	(110,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						(56,000,000)	(12,000,000)
Short-term borrowings—trade receivable securitization facility						349,000,000	350,000,000
Long-term Debt						19,401,000,000	19,445,000,000
Current portion of long-term debt						71,000,000	76,000,000
Long-term Debt, Gross and Lease Obligation						19,492,000,000	19,490,000,000
Deferred Finance Costs, Excluding Current Maturities						(106,000,000)	(109,000,000)
Debt Instrument, Unamortized Discount, Excluding Current Maturities						(56,000,000)	(12,000,000)
LONG-TERM DEBT						19,330,000,000	19,369,000,000
Finance Lease, Liability						$ 193,000,000	146,000,000
Asset-backed Securities [Member]
Debt Instrument [Line Items]
Debt Instrument, Term						1 year
Short-term Bank Loans and Notes Payable, Gross						$ 350,000,000	350,000,000
Debt Issuance Costs, Net						(1,000,000)	0
Debt Instrument, Unamortized Discount (Premium), Net						0	0
Short-term borrowings—trade receivable securitization facility						$ 349,000,000	$ 350,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity											$ 810,000,000
Debt Instrument, Interest Rate, Effective Percentage						2.50%
Debt Instrument, Unused Portion, Fee, Percent						0.50%
Term Loans [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage						8.49%	5.92%
Long-term Debt, Gross						$ 6,249,000,000	$ 7,298,000,000
Debt Issuance Costs, Net						(22,000,000)	(29,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						(48,000,000)	(13,000,000)
Long-term Debt						$ 6,179,000,000	7,256,000,000
Term Loans [Member] \| London Interbank Offered Rate (LIBOR) 1
Debt Instrument [Line Items]
Basis spread on SOFR						2.25%
Term Loans [Member] \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Basis spread on SOFR						3.25%
Term Loans [Member] \| Tranche E
Debt Instrument [Line Items]
Long-term Debt, Gross						$ 0	2,155,000,000
Term Loans [Member] \| Tranche F
Debt Instrument [Line Items]
Long-term Debt, Gross						0	3,418,000,000
Term Loans [Member] \| Tranche G [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross						$ 0	1,725,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $950M due 2026 6.375%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.375%
Long-term Debt, Gross							950,000,000
Debt Issuance Costs, Net							(4,000,000)
Debt Instrument, Unamortized Discount (Premium), Net							0
Long-term Debt						$ 0	946,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $500M due 2026 6.875%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.875%
Long-term Debt, Gross							500,000,000
Debt Issuance Costs, Net							(3,000,000)
Debt Instrument, Unamortized Discount (Premium), Net							(2,000,000)
Long-term Debt						$ 0	495,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $550M due 2027 7.50%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						7.50%
Long-term Debt, Gross						$ 550,000,000	550,000,000
Debt Issuance Costs, Net						(2,000,000)	(3,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						0	0
Long-term Debt						$ 548,000,000	547,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $2,650M due 2027 5.50%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						5.50%
Long-term Debt, Gross						$ 2,650,000,000	2,650,000,000
Debt Issuance Costs, Net						(12,000,000)	(15,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						0	0
Long-term Debt						$ 2,638,000,000	2,635,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $1,200M due 2029 4.625%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						4.625%
Long-term Debt, Gross						$ 1,200,000,000	1,200,000,000
Debt Issuance Costs, Net						(7,000,000)	(9,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						0	0
Long-term Debt						$ 1,193,000,000	1,191,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $750M due 2029 4.875%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						4.875%
Long-term Debt, Gross						$ 750,000,000	750,000,000
Debt Issuance Costs, Net						(5,000,000)	(6,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						0	0
Long-term Debt						$ 745,000,000	744,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $2,100M due 2028 6.75%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.75%
Long-term Debt, Gross						$ 2,100,000,000
Debt Issuance Costs, Net						(19,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						(10,000,000)
Long-term Debt						$ 2,071,000,000
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $1,450M due 2030 6.875%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.875%
Long-term Debt, Gross						$ 1,450,000,000
Debt Issuance Costs, Net						(14,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						0
Long-term Debt						1,436,000,000
Government Refundable Advances [Member]
Debt Instrument [Line Items]
Government refundable advances						21,000,000	23,000,000
Debt Issuance Costs, Net						0	0
Debt Instrument, Unamortized Discount (Premium), Net						0	0
Long-term Debt						21,000,000	23,000,000
Finance Lease Obligations
Debt Instrument [Line Items]
Debt Issuance Costs, Net						0	0
Debt Instrument, Unamortized Discount (Premium), Net						0	0
Finance Lease, Liability						193,000,000	146,000,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Remaining Borrowing Capacity						$ 759,000,000	779,000,000
Secured Debt [Member] \| Senior Secured Notes $1,100M due 2025 8.00%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						8.00%
Long-term Debt, Gross							1,100,000,000
Debt Issuance Costs, Net							(6,000,000)
Debt Instrument, Unamortized Discount (Premium), Net							0
Long-term Debt						$ 0	1,094,000,000
Secured Debt [Member] \| Senior Secured Notes $4,400M due 2026 6.25%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						6.25%
Long-term Debt, Gross						$ 4,400,000,000	4,400,000,000
Debt Issuance Costs, Net						(25,000,000)	(35,000,000)
Debt Instrument, Unamortized Discount (Premium), Net						2,000,000	3,000,000
Long-term Debt						4,377,000,000	4,368,000,000
Long-term Debt, Current Maturities [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount						0
Debt Issuance Costs, Net						0	(1,000,000)
Debt Instrument, Unamortized Discount (Premium), Net							0
Long-term Debt, Current Maturities, Gross						71,000,000	77,000,000
Current portion of long-term debt						71,000,000	$ 76,000,000
Senior Secured Notes $1,450M due 2030 6.875%
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,450,000,000
Debt Instrument, Interest Rate, Stated Percentage		6.875%
Debt Instrument, Redemption Price, Percentage		100.00%
Senior Secured Notes $1,000M due 2028 6.75%
Debt Instrument [Line Items]
Debt Issuance Costs, Gross						9,800,000
Debt instrument, face amount					$ 1,000,000,000
Debt Instrument, Interest Rate, Stated Percentage					6.75%
Debt Instrument, Redemption Price, Percentage					100.00%
Senior Secured Notes $1,100M due 2028 6.75%
Debt Instrument [Line Items]
Debt Issuance Costs, Gross						11,600,000
Debt instrument, face amount				$ 1,100,000,000
Debt Instrument, Interest Rate, Stated Percentage				6.75%
Debt Instrument, Unamortized Discount				$ 11,000,000
Debt Instrument, Issuance Price, Percentage				99.00%
Senior Secured Notes $1,100M due 2025 8.00%
Debt Instrument [Line Items]
Debt instrument, face amount					$ 1,100,000,000
Refinancing costs						27,100,000
Debt Instrument, Repurchased Face Amount			$ 1,100,000,000
Debt Instrument, Redemption Price, Percentage			102.00%
Debt Instrument, Repurchase Amount			$ 1,700,000
Redemption Premium						22,000,000
Write-off of debt issuance costs						4,800,000
Senior Subordinated Notes $1,450M due 2030 6.875%
Debt Instrument [Line Items]
Debt Issuance Costs, Gross						14,000,000
Senior Subordinated Notes $950M due 2026 6.375%
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	6.375%	6.375%
Debt Instrument, Repurchased Face Amount	$ 950,000,000
Debt Instrument, Redemption Price, Percentage	100.00%
Redemption Premium	$ 0
Write-off of debt issuance costs						5,100,000
Write Off of Original Issue Discount						1,300,000
Debt Instrument, Accrued Interest Payment	15,500,000
2026 & 2028 Secured Notes
Debt Instrument [Line Items]
Long Term Debt, Principal Amount, Guaranteed						200,000,000
Senior Subordinated Notes $500M due 2026 6.875%
Debt Instrument [Line Items]
Refinancing costs	$ 15,000,000
Debt Instrument, Interest Rate, Stated Percentage	6.875%
Debt Instrument, Repurchased Face Amount	$ 500,000,000
Debt Instrument, Redemption Price, Percentage	101.719%
Redemption Premium	$ 8,600,000
Debt Instrument, Accrued Interest Payment	$ 11,700,000
Tranche G Term Loans
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount										$ 1,725,000,000
Write-off of debt issuance costs						200,000
Write Off of Original Issue Discount						100,000
Tranche G Term Loans \| London Interbank Offered Rate (LIBOR) 1
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										2.25%
Tranche H Term Loans
Debt Instrument [Line Items]
Debt instrument, face amount										$ 1,725,000,000
Refinancing costs						4,600,000
Debt Instrument, Unamortized Discount (Premium), Net										$ (34,500,000)
Original Issue Discount Rate										2.00%
Tranche H Term Loans \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage										3.25%
Tranche E
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount					$ 2,149,000,000
Tranche E \| London Interbank Offered Rate (LIBOR) 1
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					2.25%
Tranche F
Debt Instrument [Line Items]
Debt Instrument, Repurchase Amount					$ 3,410,000,000
Tranche F \| London Interbank Offered Rate (LIBOR) 1
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					2.25%
Tranche I
Debt Instrument [Line Items]
Debt instrument, face amount					$ 4,559,000,000
Refinancing costs						9,200,000
Debt Instrument, Unamortized Discount (Premium), Net					$ (11,400,000)
Debt Instrument, Redemption Price, Percentage					0.25%
Write-off of debt issuance costs						100,000
Write Off of Original Issue Discount						100,000
Tranche I \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					3.25%
Securitization Facility
Debt Instrument [Line Items]
Maximum borrowing capacity						$ 350,000,000			$ 450,000,000
Debt, Weighted Average Interest Rate						6.80%	3.80%
Line of Credit Facility, Amount Drawn						$ 350,000,000
Securitization Facility \| Secured Overnight Financing Rate (SOFR)
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage						1.30%			1.60%

RETIREMENT PLANS - Narratives (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized		$ 34.0	$ 30.0	$ 28.0
Defined Benefit Plan, Plan Assets, Amount		147.0	142.0
Defined benefit plan, accumulated benefit obligation		$ 152.0	158.0
Equity Securities [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		35.00%
Equity Securities [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		55.00%
Debt Securities [Member] \| Minimum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		45.00%
Debt Securities [Member] \| Maximum [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		65.00%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage		0.00%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		$ 1.0	1.0	1.0
UNITED STATES \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		8.0	9.0	341.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		(8.0)	20.0	(10.0)
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(4.0)	(6.0)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement		0.0	295.0
Defined Benefit Plan, Plan Assets, Payment for Settlement		$ 0.0	$ 295.0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.25%	4.29%
UNITED STATES \| Pension Plan [Member] \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Expected Contributions by Employer	$ 0.3
Foreign Plan [Member] \| Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount		$ 139.0	$ 133.0	206.0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)		3.0	1.0	$ 3.0
Defined Benefit Plan, Funded (Unfunded) Status of Plan		(5.0)	(15.0)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement		0.0	0.0
Defined Benefit Plan, Plan Assets, Payment for Settlement		$ 0.0	$ 0.0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate		5.56%	4.90%
Foreign Plan [Member] \| Pension Plan [Member] \| Forecast
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Expected Contributions by Employer	$ 1.9

DEBT - Schedule of Subordinated Borrowings (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 19,563	$ 19,567
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $950M due 2026 6.375%
Subordinated Borrowing [Line Items]
Long-term Debt, Gross		950
Debt Instrument, Interest Rate, Stated Percentage	6.375%
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $550M due 2027 7.50%
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 550	550
Debt Instrument, Interest Rate, Stated Percentage	7.50%
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $2,650M due 2027 5.50%
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 2,650	2,650
Debt Instrument, Interest Rate, Stated Percentage	5.50%
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $1,200M due 2029 4.625%
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 1,200	1,200
Debt Instrument, Interest Rate, Stated Percentage	4.625%
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $750M due 2029 4.875%
Subordinated Borrowing [Line Items]
Long-term Debt, Gross	$ 750	750
Debt Instrument, Interest Rate, Stated Percentage	4.875%
Senior Subordinated Notes [Member] \| Senior Subordinated Notes $500M due 2026 6.875%
Subordinated Borrowing [Line Items]
Long-term Debt, Gross		$ 500
Debt Instrument, Interest Rate, Stated Percentage	6.875%

LEASES

12 Months Ended

Sep. 30, 2023

Leases [Abstract]

LEASES

The Company leases certain manufacturing facilities, offices, land, equipment and vehicles. Such leases, some of which are noncancellable and, in many cases, include renewals, expire at various dates. Such options to renew are included in the lease term when it is reasonably certain that the option will be exercised. The Company’s lease agreements typically do not contain any significant residual value guarantees or restrictive covenants, and payments within certain lease agreements are adjusted periodically for changes in an index or rate.

The Company determines if an arrangement is a lease at inception. Operating lease assets and liabilities are recognized at the commencement date of the lease based on the present value of lease payments over the lease term. Lease assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. The discount rate implicit within our leases is generally not determinable and therefore we determine the discount rate based on our incremental borrowing rate. The incremental borrowing rate for our leases is determined based on the lease term and the currency in which lease payments are made. The length of a lease term includes options to extend or terminate the lease when it is reasonably certain that the Company will exercise those options. The Company made an accounting policy election to not recognize lease assets or liabilities for leases with a term of 12 months or less. Additionally, when accounting for leases, the Company combines payments for leased assets, related services and other components of a lease.

The components of lease expense for the fiscal years ended September 30, 2023 and 2022 are as follows (in millions):


		Fiscal Years Ended September 30,
	Classification	2023		2022
Operating lease cost	Cost of sales or selling and administrative expenses	$	21	$	24
Finance lease cost:
Amortization of leased assets	Cost of sales	9		6
Interest on lease liabilities	Interest expense-net	13		9
Total lease cost		$	43	$	39

Supplemental cash flow information related to leases for the fiscal years ended September 30, 2023 and 2022 is as follows (in millions):


	Fiscal Years Ended September 30,
	2023		2022
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash outflows from operating leases	$	21	$	24
Operating cash outflows from finance leases	10		8
Financing cash outflows from finance leases	5		2

Lease assets obtained in exchange for new lease obligations:
Operating leases	$	17	$	21
Financing leases	48		51

Supplemental balance sheet information related to leases is as follows (in millions):


	Classification	September 30, 2023		September 30, 2022
Operating Leases
Operating lease right-of-use assets	Other non-current assets	$	64	$	85

Current operating lease liabilities	Accrued and other current liabilities	16		18
Long-term operating lease liabilities	Other non-current liabilities	51		71
Total operating lease liabilities		$	67	$	89

Finance Leases
Finance lease right-of-use assets, net	Property, plant and equipment-net	$	176	$	137

Current finance lease liabilities	Current portion of long-term debt	5		2
Long-term finance lease liabilities	Long-term debt	188		144
Total finance lease liabilities		$	193	$	146

As of September 30, 2023, the Company has the following remaining lease term and weighted average discount rates:


Weighted-average remaining lease term
Operating leases			5.5 years
Finance leases			20.0 years

Weighted-average discount rate
Operating leases			6.1%
Finance leases			7.0%

Maturities of lease liabilities at September 30, 2023 are as follows (in millions):


	Operating Leases		Finance Leases
2024	$	20	$	16
2025	18		17
2026	13		17
2027	10		17
2028	6		17
Thereafter	13		295
Total future minimum lease payments	80		379
Less: imputed interest	13		186
Present value of lease liabilities reported	$	67	$	193

DERIVATIVES AND HEDGING ACTIVITIES - Narratives (Detail) $ in Millions	12 Months Ended
	Sep. 30, 2023 USD ($)
Interest Rate Swap and Cap
Derivative [Line Items]
Derivative (gain) loss to be recognized	$ (100.0)
Foreign Exchange Forward [Member]
Derivative [Line Items]
Derivative, Notional Amount	$ 163.0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimate of Time to Transfer	12 months
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Net Sales upon Settlement	$ (3.0)
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Earnings, net of Tax, Next 12 months (Estimated)	$ (5.0)

INCOME TAXES (Tables)

12 Months Ended

Sep. 30, 2023

Income Tax Disclosure [Abstract]

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The Company’s income from continuing operations before income taxes includes the following components for the periods shown below (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
United States	$	1,413	$	882	$	516
Foreign	303		245		199
	$	1,716	$	1,127	$	715

Income Tax Provision on Income Before Income Taxes

The Company’s income tax provision (benefit) on income from continuing operations consists of the following for the periods shown below (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Current
Federal	$	276	$	194	$	(21)
State	41		27		14
Foreign	97		62		7
	414		283		—
Deferred
Federal	28		(17)		7
State	11		(8)		(2)
Foreign	(36)		3		29
	3		(22)		34
	$	417	$	261	$	34

Schedule of Effective Income Tax Rate Reconciliation

A reconciliation of the federal statutory income tax rate to the effective income tax rate for the periods shown below is as follows:


	Fiscal Years Ended September 30,
	2023		2022		2021
Federal statutory income tax rate	21.0	%	21.0	%	21.0	%
Changes in valuation allowances impacting results (1)	5.3	%	5.5	%	(8.2)	%
State and local income taxes, net of federal benefit	1.7	%	0.1	%	0.4	%
Provision to return adjustments	0.3	%	(1.0)	%	2.2	%
Federal deemed inclusion amounts	0.3	%	1.5	%	1.7	%
Resolution and settlements to uncertain tax positions	0.3	%	(0.1)	%	(3.2)	%
Withholding taxes	0.2	%	1.2	%	0.2	%
Research and development credits	(0.4)	%	(0.6)	%	(1.2)	%
Foreign tax credits	(0.5)	%	(0.8)	%	(1.2)	%
Foreign-derived intangible income	(1.2)	%	(2.0)	%	(1.5)	%
Stock-based compensation	(2.3)	%	(2.8)	%	(8.7)	%
Gain on sale of businesses	—	%	(0.1)	%	1.4	%
Remeasurement of deferred tax assets and liabilities related to enacted statutory rate changes	—	%	—	%	2.1	%
Other—net	(0.4)	%	1.3	%	(0.2)	%
Effective income tax rate	24.3	%	23.2	%	4.8	%

Components of Deferred Taxes

The components of the deferred taxes consist of the following (in millions):


	September 30, 2023		September 30, 2022
Deferred tax assets (liabilities):
Intangible assets	$	(852)	$	(832)
Property, plant and equipment	(82)		(23)
Interest rate swaps and caps	(47)		(42)
Interest expense limitation	190		87
Employee benefits	103		108
Inventories	89		61
Net operating losses	66		52
Capitalized research and development costs	52		24
Loss contract reserves	36		41
U.S. income tax credits	25		27
Environmental reserves	10		11
Non-U.S. income tax credits	9		14
Product warranty reserves	6		6
Other	(5)		7
Total	(400)		(459)
Add: Valuation allowance	(227)		(137)
Total net deferred tax assets (liabilities)	$	(627)	$	(596)

Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in millions):


	2023		2022
Balance at October 1	$	17	$	19

Additions based on tax positions related to the prior year	4		3
Additions based on tax positions related to the current year	—		—
Reductions based on tax positions related to the prior year	—		(1)
Settlement with tax authorities	(3)		(1)
Lapse in statute of limitations	(1)		(3)
Balance at September 30	$	17	$	17

FAIR VALUE MEASUREMENTS

12 Months Ended

Sep. 30, 2023

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

The following table presents our assets and liabilities that are measured at fair value on a recurring basis and are categorized using the fair value hierarchy. The fair value hierarchy has three levels based on the reliability of the inputs used to determine fair value. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, and inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly. Level 3 inputs are unobservable inputs for the asset or liability. A financial asset or liability’s classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement.

The following summarizes the carrying amounts and fair values of financial instruments (in millions):


		September 30, 2023				September 30, 2022
	Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	3,472	$	3,472	$	3,001	$	3,001
Interest rate swap agreements (1)	2	103		103		77		77
Interest rate swap agreements (2)	2	41		41		68		68
Interest rate cap agreements (2)	2	53		53		50		50
Interest rate collar agreements (2)	2	17		17		—		—
Liabilities:
Foreign currency forward exchange contracts (3)	2	5		5		11		11
Interest rate swap agreements (4)	2	3		3		—		—
Interest rate cap agreements (4)	2	1		1		—		—
Short-term borrowings - trade receivable securitization facility (5)	2	349		349		350		350
Long-term debt, including current portion:
Term loans (5)	2	6,179		6,212		7,256		6,976
2025 Secured Notes (5)	1	—		—		1,094		1,115
6.375% 2026 Notes (5)	1	—		—		946		884
6.875% 2026 Notes (5)	1	—		—		495		473
2026 Secured Notes (5)	1	4,377		4,329		4,368		4,257
7.50% 2027 Notes (5)	1	548		549		547		524
5.50% 2027 Notes (5)	1	2,638		2,484		2,635		2,286
2028 Secured Notes (5)	1	2,071		2,069		—		—
4.625% 2029 Notes (5)	1	1,193		1,047		1,191		966
4.875% 2029 Notes (5)	1	745		654		744		606
2030 Secured Notes (5)	1	1,436		1,423		—		—
Government refundable advances	2	21		21		23		23
Finance lease obligations	2	193		193		146		146

(1)Included in prepaid expenses and other on the consolidated balance sheets.

(2)Included in other assets on the consolidated balance sheets.

(3)Included in accrued and other current liabilities on the consolidated balance sheets.

(4)Included in other non-current liabilities on the consolidated balance sheets.

(5)The carrying amount of the debt instrument is presented net of the debt issuance costs, premium and discount. Refer to Note 12, “Debt,” for gross carrying amounts.

The Company values its financial instruments using an industry standard market approach, in which prices and other relevant information are generated by market transactions involving identical or comparable assets or liabilities. No financial instruments were recognized or disclosed using unobservable inputs (i.e., Level 3).

The Company’s derivatives consist of interest rate swap, cap and collar agreements and foreign currency exchange contracts. The fair values of the interest rate swap, cap and collar agreements were derived by taking the net present value of the expected cash flows using observable market inputs (Level 2) such as SOFR rate curves, futures, volatilities and basis spreads (when applicable). The fair values of the foreign currency exchange contracts were derived by using Level 2 inputs based on observable spot and forward exchange rates in active markets. There has not been any impact to the fair value of derivative liabilities due to the Company's own credit risk. Similarly, there has not been any material impact to the fair value of derivative assets based on the Company's evaluation of counterparties' credit risks.

The estimated fair value of the Company’s term loans was based on information provided by the agent under the Company’s Credit Agreement. The estimated fair values of the Company’s notes were based upon quoted market prices.

The fair value of cash and cash equivalents, trade accounts receivable-net and accounts payable approximated carrying value due to the short-term nature of these instruments at September 30, 2023 and 2022.

LEASES - Operating and Finance Leases, Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating Lease, Right-of-Use Asset	$ 64	$ 85
Current operating lease liabilities (Note 19)	16	18
Operating Lease, Liability, Noncurrent	51	71
Operating Lease, Liability	67	89
Finance Lease, Right-of-Use Asset	176	137
Finance Lease, Liability, Current	5	2
Finance Lease, Liability, Noncurrent	188	144
Finance Lease, Liability	$ 193	$ 146
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT ASSETS	OTHER NON-CURRENT ASSETS
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued and other current liabilities	Accrued and other current liabilities
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	OTHER NON-CURRENT LIABILITIES	OTHER NON-CURRENT LIABILITIES
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	PROPERTY, PLANT AND EQUIPMENT—NET	PROPERTY, PLANT AND EQUIPMENT—NET
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current portion of long-term debt	Current portion of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration]	LONG-TERM DEBT	LONG-TERM DEBT

ACQUISITIONS AND DIVESTITURES - Calspan Corporation (Details) - USD ($) $ in Millions		5 Months Ended	12 Months Ended
	May 08, 2023	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 762	$ 437	$ 963
Assets acquired (excluding cash):
GOODWILL		$ 8,988	8,988	8,641	$ 8,568
Purchase price allocation adjustments (1)			7	$ 3
Calspan Corporation
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 729
Assets acquired (excluding cash):
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	39	39	39
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Current Assets, Receivable		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	2	2	2
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	40	40	40
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Current Assets, Prepaid Expenses and Other		0
Property, plant, and equipment	105	383	383
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment		278
GOODWILL	367	244	244
Purchase price allocation adjustments (1)		(123)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	243	92	92
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles		(151)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets	7	7	7
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Assets		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	803	807	807
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Total Assets Acquired		4
Liabilities assumed:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	10	9	9
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Accounts Payable		(1)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	50	50	50
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Accrued and Other Current Liabilities		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	8	13	13
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Deferred Income Taxes		5
Other noncurrent liabilities	6	6	6
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Non-Current Liabilities		0
Business acquisition, assumption of net indebtedness	74	78	78
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Total Liabilities Assumed		4
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 729	729	729
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Net Assets Acquired		0
Amount of goodwill expected to be tax deductible		218	218
Business Acquisition, Intangible Assets, Expected Tax Deductible Amount		$ 86	$ 86
Business Acquisition, Goodwill and Intangible Assets, Expected Tax Deductible Amount, Period of Deduction			15 years

REVENUE RECOGNITION (Tables)

12 Months Ended

Sep. 30, 2023

Revenue Recognition [Abstract]

Contract with Customer, Asset and Liability


	September 30, 2023		September 30, 2022
Contract assets, current (1)	$	191	$	119
Contract assets, non-current (2)	1		1
Total contract assets	192		120
Contract liabilities, current (3)	79		45
Contract liabilities, non-current (4)	8		9
Total contract liabilities	87		54
Net contract assets	$	105	$	66

(1)Included in prepaid expenses and other on the consolidated balance sheets.

(2)Included in other non-current assets on the consolidated balance sheets.

(3)Included in accrued and other current liabilities on the consolidated balance sheets.

(4)Included in other non-current liabilities on the consolidated balance sheets.

REVENUE RECOGNITION (Details) - USD ($) $ in Millions	12 Months Ended
REVENUE RECOGNITION (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Revenues	$ 6,585	$ 5,429	$ 4,798
Contract with Customer, Asset, Net, Current	191	119
Contract with Customer, Asset, Net, Noncurrent	1	1
Contract with Customer, Asset, after Allowance for Credit Loss	192	120
Contract liabilities, current (Note 5)	79	45
Contract with Customer, Liability, Noncurrent	8	9
Contract with Customer, Liability	87	54
Net Contract Asset	105	$ 66
ContractWithCustomer Liability, Revenue Recognized, Excluding Opening Balance	$ 63
Revenue Benchmark [Member] \| Customer Concentration Risk \| Customer 1
Percentage of net sales from one customer	10.00%	10.00%	10.00%
Geographic Distribution, Foreign
Revenues	$ 2,300	$ 1,900	$ 1,700

ACQUISITIONS AND DIVESTITURES - DART Aerospace (Details) - USD ($) $ in Millions		4 Months Ended	12 Months Ended
	May 25, 2022	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			$ 762	$ 437	$ 963
Assets acquired (excluding cash):
GOODWILL		$ 8,641	8,988	8,641	$ 8,568
Purchase price allocation adjustments (1)			7	3
DART Aerospace [Member]
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	$ 359
Working Capital Settlement Received		1		$ 1
Assets acquired (excluding cash):
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables	16		14
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Current Assets, Receivable		(2)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory	33		32
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory		(1)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Prepaid Expense and Other Assets	4		4
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Current Assets, Prepaid Expenses and Other		0
Property, plant, and equipment	9		9
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment		0
GOODWILL	236		205
Purchase price allocation adjustments (1)		(31)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	112		148
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles		36
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Assets	8		17
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Assets		9
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	418		429
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Total Assets Acquired		11
Liabilities assumed:
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	4		4
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Accounts Payable		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Other	11		14
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Accrued and Other Current Liabilities		3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities	35		35
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Deferred Income Taxes		0
Other noncurrent liabilities	8		17
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Other Non-Current Liabilities		9
Business acquisition, assumption of net indebtedness	58		70
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Total Liabilities Assumed		12
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net	$ 360		$ 359
Business Combination Provisional Information Initial Accounting Incomplete Adjustment Net Assets Acquired		$ (1)

DEBT - Schedule of Term Loans (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 19,563	$ 19,567
Repayment on revolving credit facility	0	200	$ 200
Term Loans [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 6,249	$ 7,298
Debt Instrument, Interest Rate, Effective Percentage	8.49%	5.92%
Term Loans [Member] \| Tranche E
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0	$ 2,155
Term Loans [Member] \| Tranche F
Debt Instrument [Line Items]
Long-term Debt, Gross	0	3,418
Term Loans [Member] \| Tranche G [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	0	1,725
Term Loans [Member] \| Tranche H
Debt Instrument [Line Items]
Long-term Debt, Gross	1,713	0
Term Loans [Member] \| Tranche I
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 4,536	$ 0

RETIREMENT PLANS Tables (Details) - USD ($) $ in Millions	12 Months Ended
RETIREMENT PLANS Tables (Details) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	100.00%	100.00%
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 11
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	11
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	12
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	11
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	12
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	60
Defined Benefit Plan, Plan Assets, Amount	147	$ 142
Cash refund (contribution) for the ERP settlement, net	9	(16)	$ 0
(Gain) Loss on settlement of the Esterline Retirement Plan (the “ERP”)	$ 9	$ (22)	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)	Other Nonoperating Income (Expense)
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 29	$ 26
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	40	41
Fair Value Measured at Net Asset Value Per Share [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Amount	$ 78	$ 75
Equity Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	42.70%	42.00%
Debt Securities [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	56.00%	57.60%
Cash and Cash Equivalents [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage	1.30%	0.40%
Other Postretirement Benefits Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 1	$ 1	$ 1
Pension Plan [Member] \| UNITED STATES
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.25%	4.29%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	5.37%	2.64%
Defined Benefit Plan, Benefit Obligation	$ 12	$ 15	351
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Service Cost	0	0	2
Defined Benefit Plan, Interest Cost	1	4	6
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(1)	(30)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0	(295)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(3)	(15)
Defined Benefit Plan, Plan Assets, Amount	8	9	341
Defined Benefit Plan, Benefit Obligations	(12)	(15)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	0	0
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	11	(39)
Defined Benefit Plan, Plan Assets, Contributions by Employer	(9)	17
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	(295)
Defined Benefit Plan, Plan Assets, Benefits Paid	(3)	(15)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(4)	(6)
Assets for Plan Benefits, Defined Benefit Plan	0	0
Liability, Defined Benefit Plan, Current	(1)	(1)
Liability, Defined Benefit Plan, Noncurrent	(3)	(5)
Liability, Defined Benefit Plan	(4)	(6)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	1	3
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	0	0
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	1	3
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	0	(6)	(19)
Defined Benefit Plan, Amortization of Gain (Loss)	0	0	1
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	(9)	22	0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	(8)	20	(10)
(Gain) Loss on settlement of the Esterline Retirement Plan (the “ERP”)	$ (9)	$ (22)
Pension Plan [Member] \| Foreign Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate	5.56%	4.90%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase	3.19%	3.38%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets	5.41%	3.55%
Defined Benefit Plan, Benefit Obligation	$ 144	$ 148	224
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	8	(21)
Defined Benefit Plan, Service Cost	2	3	5
Defined Benefit Plan, Interest Cost	7	4	5
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)	(13)	(53)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	0	0
Defined Benefit Plan, Benefit Obligation, Benefits Paid	(8)	(9)
Defined Benefit Plan, Plan Assets, Amount	139	133	206
Defined Benefit Plan, Benefit Obligations	(144)	(148)
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	6	(18)
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss)	6	(49)
Defined Benefit Plan, Plan Assets, Contributions by Employer	2	3
Defined Benefit Plan, Plan Assets, Payment for Settlement	0	0
Defined Benefit Plan, Plan Assets, Benefits Paid	(8)	(9)
Defined Benefit Plan, Funded (Unfunded) Status of Plan	(5)	(15)
Assets for Plan Benefits, Defined Benefit Plan	12	6
Liability, Defined Benefit Plan, Current	0	(1)
Liability, Defined Benefit Plan, Noncurrent	(17)	(20)
Liability, Defined Benefit Plan	(5)	(15)
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax	1	12
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax	1	2
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax	2	14
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	(7)	(7)	(7)
Defined Benefit Plan, Amortization of Gain (Loss)	1	1	2
Defined Benefit Plan, Benefit Obligation, Payment for Settlement	0	0	(2)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 3	$ 1	$ 3

RETIREMENT PLANS (Tables)

12 Months Ended

Sep. 30, 2023

Retirement Benefits [Abstract]

Schedule of Net Benefit Costs [Table Text Block]


	Defined Benefit Pension Plans
	2023				2022				2021
	U.S. Pension Plans		Non-U.S. Pension Plans		U.S. Pension Plans		Non-U.S. Pension Plans		U.S. Pension Plans		Non-U.S. Pension Plans
Service cost	$	—	$	2	$	—	$	3	$	2	$	5
Interest cost	1		7		4		4		6		5
Expected return on plan assets	—		(7)		(6)		(7)		(19)		(7)
Amortization of net loss	—		1		—		1		1		2
Settlement (gain) loss (1)	(9)		—		22		—		—		(2)
Net periodic pension benefit (income) cost	$	(8)	$	3	$	20	$	1	$	(10)	$	3

Schedule of Net Funded Status [Table Text Block]


	Defined Benefit Pension Plans
	September 30, 2023				September 30, 2022
	U.S. Pension Plans		Non-U.S. Pension Plans		U.S. Pension Plans		Non-U.S. Pension Plans
Benefit Obligations
Beginning balance	$	15	$	148	$	351	$	224
Currency translation adjustment	—		8		—		(21)
Service cost	—		2		—		3
Interest cost	1		7		4		4
Actuarial gain	(1)		(13)		(30)		(53)
Settlements	—		—		(295)		—
Benefits paid	(3)		(8)		(15)		(9)
Ending balance	$	12	$	144	$	15	$	148
Plan Assets - Fair Value
Beginning balance	$	9	$	133	$	341	$	206
Currency translation adjustment	—		6		—		(18)
Realized and unrealized gain (loss) on plan assets	11		6		(39)		(49)
Company (refunds) contributions	(9)		2		17		3
Settlements	—		—		(295)		—
Benefits paid	(3)		(8)		(15)		(9)
Ending balance	$	8	$	139	$	9	$	133
Funded Status
Fair value of plan assets	$	8	$	139	$	9	$	133
Benefit obligations	(12)		(144)		(15)		(148)
Net amount recognized	$	(4)	$	(5)	$	(6)	$	(15)
Amount Recognized on Consolidated Balance Sheets
Other non-current assets	$	—	$	12	$	—	$	6
Accrued and other current liabilities	(1)		—		(1)		(1)
Other non-current liabilities	(3)		(17)		(5)		(20)
Net amount recognized	$	(4)	$	(5)	$	(6)	$	(15)
Amounts Recognized in Accumulated Other Comprehensive Loss (Income)
Net loss (gain)	$	1	$	1	$	3	$	12
Prior service cost	—		1		—		2
Ending balance	$	1	$	2	$	3	$	14

Schedule of Expected Benefit Payments [Table Text Block]

Estimated future benefit payments expected to be paid from the pension and post-retirement pension plans or from the Company’s assets are as follows (in millions):


Fiscal Years Ended September 30,
2024	$	11
2025	11
2026	12
2027	11
2028	12
2029 - 2033	60

Defined Benefit Plan, Assumptions [Table Text Block]


	U.S. Defined Benefit Pension Plans		Non-U.S. Defined Benefit Pension Plans
Principal assumptions as of year end	2023	2022	2023	2022
Discount rate	5.25%	4.29%	5.56%	4.90%
Rate of increase in future compensation levels	N/A (1)	N/A (1)	3.19%	3.38%
Assumed long-term rate of return on plan assets	5.37%	2.64%	5.41%	3.55%

Defined Benefit Plan, Plan Assets, Allocation [Table Text Block]

Allocations by investment type are as follows:


		Actual
Plan assets allocation as of fiscal year end	Target	2023	2022
Return-seeking assets (e.g., equity securities and real estate)	35% - 55%	42.7%	42.0%
Fixed-income securities (e.g., debt securities)	45% - 65%	56.0%	57.6%
Cash	0%	1.3%	0.4%
Total		100.0%	100.0%

Defined Benefit Plan, Plan Assets, Category [Table Text Block]


	Fair Value Hierarchy
	September 30, 2023		September 30, 2022
Investments measured at fair value by level: (4)
Level 1 (1)	$	29	$	26
Level 2 (2)	40		41
Investments measured at net asset value (3)	78		75
Total	$	147	$	142

(4) No investments measured using Level 3 inputs.

STOCK REPURCHASE PROGRAM	12 Months Ended
STOCK REPURCHASE PROGRAM	Sep. 30, 2023
Equity [Abstract]
STOCK REPURCHASE PROGRAM	STOCK REPURCHASE PROGRAMTD Group consists of 224,400,000 shares of $.01 par value common stock and 149,600,000 shares of $.01 par value preferred stock. The total number of shares of common stock issued at September 30, 2023 and 2022 was 60,995,513 and 60,049,685, respectively. The total number of shares held in treasury was 5,688,639 at September 30, 2023 and 2022, respectively. There were no shares of preferred stock outstanding at September 30, 2023 and 2022. The terms of the preferred stock have not been established.On January 27, 2022, the Board of Directors of the Company (the “Board”) authorized a new stock repurchase program to permit repurchases of its outstanding common stock not to exceed $2,200 million in the aggregate (the “$2,200 million stock repurchase program”), replacing the $650 million stock repurchase program previously authorized by the Board on November 8, 2017, subject to any restrictions specified in the Second Amended and Restated Credit Agreement dated as of June 4, 2014, and indentures governing the Company's existing Notes. There is no expiration date for this program. No repurchases were made under the program during fiscal 2023. During fiscal 2022, the Company repurchased 1,490,413 shares of common stock at an average price of $612.13 per share, for a total amount of $912 million. The repurchased shares of common stock are classified as treasury stock in the statement of changes in stockholders' deficit. As of September 30, 2023, $1,288 million remains available for repurchase under the $2,200 million stock repurchase program.

- Definition

The entire disclosure for equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 13
-Subparagraph (h)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-13

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-14

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 235
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481062/946-235-50-2

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481004/946-505-50-6

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 815
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480237/815-40-50-6

Reference 8: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480008/505-10-S99-1

Reference 9: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(e)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 505
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org//505/tableOfContent

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+ Details

SEGMENTS (Tables)

12 Months Ended

Sep. 30, 2023

Segment Reporting [Abstract]

Net Sales by Reportable Segment

The following table presents net sales by reportable segment (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Net sales to external customers
Power & Control
Commercial and non-aerospace OEM	$	690	$	603	$	524
Commercial and non-aerospace aftermarket	1,057		847		573
Defense	1,569		1,423		1,453
Total Power & Control	3,316		2,873		2,550

Airframe
Commercial and non-aerospace OEM	961		715		582
Commercial and non-aerospace aftermarket	1,140		785		553
Defense	993		891		948
Total Airframe	3,094		2,391		2,083

Total Non-aviation	175		165		165

Net Sales	$	6,585	$	5,429	$	4,798

EBITDA Defined by Segment to Consolidated Income Before Taxes Operations

The following table reconciles EBITDA As Defined by segment to consolidated income from continuing operations before income taxes (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
EBITDA As Defined
Power & Control	$	1,866	$	1,531	$	1,319
Airframe	1,547		1,121		878
Non-aviation	71		65		62
Total segment EBITDA As Defined	3,484		2,717		2,259
Less: Unallocated corporate EBITDA As Defined	89		71		70
Total Company EBITDA As Defined	3,395		2,646		2,189
Depreciation and amortization expense	268		253		253
Interest expense-net	1,164		1,076		1,059
Acquisition and divestiture transaction-related expenses	18		18		35
Non-cash stock and deferred compensation expense	157		184		130
Refinancing costs	56		1		37
COVID-19 pandemic restructuring costs	—		—		40
Gain on sale of businesses-net	—		(7)		(69)
Other, net	16		(6)		(11)
Income from continuing operations before income taxes	$	1,716	$	1,127	$	715

Capital Expenditures and Depreciation and Amortization by Segment

The following table presents capital expenditures and depreciation and amortization by segment (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Capital expenditures
Power & Control	$	67	$	63	$	65
Airframe	65		52		37
Non-aviation	6		3		2
Corporate	1		1		1
	$	139	$	119	$	105
Depreciation and amortization
Power & Control	$	110	$	109	$	107
Airframe	152		138		139
Non-aviation	5		5		6
Corporate	1		1		1
	$	268	$	253	$	253

Total Assets by Segment

The following table presents total assets by segment (in millions):


	September 30, 2023		September 30, 2022
Total assets
Power & Control	$	7,315	$	6,994
Airframe	8,972		7,781
Non-aviation	234		238
Corporate	3,449		3,094
	$	19,970	$	18,107

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas

Geographic Area Information

The following table presents net sales by geographic area (in millions):


	Fiscal Years Ended September 30,
	2023		2022		2021
Net sales
United States	$	4,265	$	3,496	$	3,096
Foreign Countries	2,320		1,933		1,702
	$	6,585	$	5,429	$	4,798

The following table presents long-lived assets by geographic area (in millions):


	September 30, 2023		September 30, 2022
Long-lived assets
United States	$	1,063	$	663
Foreign Countries	256		229
	$	1,319	$	892

Consolidated Balance Sheets Parenthetical - $ / shares	Sep. 30, 2023	Sep. 30, 2022
Statement of Financial Position [Abstract]
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	224,400,000	224,400,000
Common Stock, Shares, Issued	60,995,513	60,049,685
Treasury Stock, Common, Shares	5,688,639	5,688,639

INTANGIBLE ASSETS (Tables)

12 Months Ended

Sep. 30, 2023

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets

Other intangible assets-net in the consolidated balance sheets consist of the following at September 30 (in millions):


	2023						2022
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Trademarks and trade names	$	1,019	$	—	$	1,019	$	990	$	—	$	990
Technology	2,124		888		1,236		2,054		780		1,274
Order backlog	7		6		1		7		3		4
Customer relationships	623		136		487		580		104		476
Other	9		5		4		9		3		6
Total	$	3,782	$	1,035	$	2,747	$	3,640	$	890	$	2,750

Schedule of Acquired Indefinite-lived Intangible Assets by Major Class

Intangible assets acquired during the fiscal year ended September 30, 2023 are summarized in the table below (in millions):


	Gross Amount		Amortization Period
Intangible assets not subject to amortization:
Goodwill	$	256
Trademarks and trade names	20
	276
Intangible assets subject to amortization:
Technology	47		20 years
Customer relationships	31		20 years
	78
Total	$	354

Schedule of Aggregate Amortization Expense

Information regarding the amortization expense of amortizable intangible assets is detailed below (in millions):

Annual Amortization Expense:


Fiscal Years Ended September 30,
2023	$	139
2022	136
2021	137

Schedule of Finite-Lived Intangible Assets, Future Amortization

Estimated Amortization Expense:


Fiscal Years Ended September 30,
2024	$	138
2025	138
2026	135
2027	134
2028	134

Summary of Changes in Carrying Value of Goodwill

The following is a summary of changes in the carrying value of goodwill by segment for the fiscal years ended September 30, 2022 and 2023 (in millions):


	Power & Control		Airframe		Non-aviation		Total
Balance at September 30, 2021	$	4,149	$	4,326	$	93	$	8,568
Goodwill acquired during the period (Note 2)	57		202		—		259
Purchase price allocation adjustments (1)	—		3		—		3
Currency translation adjustments and other	(51)		(138)		—		(189)
Balance at September 30, 2022	4,155		4,393		93		8,641
Goodwill acquired during the period (Note 2)	12		244		—		256
Purchase price allocation adjustments (2)	4		3		—		7
Currency translation adjustments and other	23		61		—		84
Balance at September 30, 2023	$	4,194	$	4,701	$	93	$	8,988

- Definition

Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule.

+ References

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+ Details

INCOME TAXES Income before Tax from Continuing Operations (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income before Tax from Continuing Operations [Abstract]
Income (Loss) from Continuing Operations before Income Taxes, Domestic	$ 1,413	$ 882	$ 516
Income (Loss) from Continuing Operations before Income Taxes, Foreign	303	245	199
INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES	$ 1,716	$ 1,127	$ 715

- Definition

Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

STOCK-BASED COMPENSATION - Narratives (Detail) - USD ($)		1 Months Ended	3 Months Ended	12 Months Ended
	Nov. 09, 2023	Mar. 31, 2011	Dec. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021	Oct. 03, 2019	Sep. 30, 2018	Oct. 02, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense				$ 135,000,000	$ 153,000,000	$ 129,000,000
Stock option weighted-average grant date fair value				$ 251.73	$ 254.21	$ 193.47
Unrecognized compensation cost related to non-vested awards expected to vest				$ 198,000,000
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				2 years
Fair value of options vested				$ 80,000,000	$ 88,000,000	$ 92,000,000
Dividend equivalent payments, current (Note 18)				19,000,000	39,000,000
Dividend Equivalent Payments on Certain Stock Options, Non-current				9,000,000
Share-Based Payment Arrangement, Tax Benefit				15,000,000	18,000,000	21,000,000
Share-Based Payment Arrangement, Noncurrent Liabilities, Other				48,000,000	26,000,000
Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividends, Common Stock, Cash			$ 2,020,000,000
Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common Stock, Dividends, Per Share, Declared	$ 35.00
Other Non-Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense				23,000,000	2,000,000	8,000,000
Additional Paid-In Capital
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash stock and deferred compensation expense				$ 112,000,000	151,000,000	121,000,000
2019 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock							4,000,000
Shares available for award				3,776,055
2014 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock									5,000,000
2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock		8,119,668
Restricted stock grant period in years		3 years
2003 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total intrinsic value of options exercised				$ 500,000,000	279,000,000	355,000,000
2014 Stock Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award				90,281
Vested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend Equivalent Payments				$ 38,000,000	$ 86,000,000	$ 73,000,000
Performance Vested Stock Options \| 2019 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award				223,945
Exercise of employee stock options (in shares)				0
Weighted-Average Exercise Price Per Option, Exercised				$ 0
Number of Options Exercisable at end of period				41,269
Weighted-Average Exercise Price Per Option, Exercisable				$ 631.65
Weighted-Average Remaining Contractual Term, Exercisable, years				9 years 3 months 18 days
Aggregate Intrinsic Value, Exercisable				$ 8,727,648
Performance Vested Stock Options \| 2014 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award				374,965
Exercise of employee stock options (in shares)				312,555
Weighted-Average Exercise Price Per Option, Exercised				$ 323.15
Number of Options Exercisable at end of period				3,065,412
Weighted-Average Exercise Price Per Option, Exercisable				$ 385.97
Weighted-Average Remaining Contractual Term, Exercisable, years				5 years 1 month 6 days
Aggregate Intrinsic Value, Exercisable				$ 1,401,378,878
Performance Vested Stock Options \| 2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for award				0
Exercise of employee stock options (in shares)				632,793
Weighted-Average Exercise Price Per Option, Exercised				$ 179.93
Number of Options Exercisable at end of period				450,192
Weighted-Average Exercise Price Per Option, Exercisable				$ 211.49
Weighted-Average Remaining Contractual Term, Exercisable, years				1 year 9 months 18 days
Aggregate Intrinsic Value, Exercisable				$ 284,357,481
Restricted Stock Units (RSUs) \| 2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Outstanding, Number								0

EARNINGS PER SHARE

12 Months Ended

Sep. 30, 2023

Earnings Per Share [Abstract]

EARNINGS PER SHARE

The following table sets forth the computation of basic and diluted earnings per share (in millions, except per share data) using the two-class method:


	Fiscal Years Ended September 30,
	2023		2022		2021
Numerator for earnings per share:
Income from continuing operations	$	1,299	$	866	$	681
Less: Net income attributable to noncontrolling interests	(1)		(1)		(1)
Net income from continuing operations attributable to TD Group	1,298		865		680
Less: Dividends paid on participating securities	(38)		(86)		(73)
Income from discontinued operations, net of tax	—		1		—
Net income applicable to TD Group common stockholders—basic and diluted	$	1,260	$	780	$	607
Denominator for basic and diluted earnings per share under the two-class method:
Weighted-average common shares outstanding	54.9		54.8		54.8
Vested options deemed participating securities	2.3		3.4		3.6
Total shares for basic and diluted earnings per share	57.2		58.2		58.4

Earnings per share from continuing operations—basic and diluted	$	22.03	$	13.38	$	10.41
Earnings per share from discontinued operations—basic and diluted	—		0.02		—
Earnings per share	$	22.03	$	13.40	$	10.41

INCOME TAXES - Narratives (Detail) - USD ($)	12 Months Ended
INCOME TAXES - Narratives (Detail) - USD ($)	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Income Tax Contingency [Line Items]
Statutory tax rate		21.00%	21.00%	21.00%
Net operating loss carryforward		$ 66,000,000	$ 52,000,000
US and non-US Tax Credit Carryforward		$ 33,700,000
US and non-US tax credit carryforward expiration period		2024
Effect of unrecognized tax benefits on effective tax rate		$ 16,900,000	16,600,000
Accrual for income tax penalties and interest		5,600,000	4,500,000
Deferred Federal Income Tax Expense (Benefit)		28,000,000	$ (17,000,000)	$ 7,000,000
Release of Valuation Allowance		69,000,000
Undistributed Earnings of Foreign Subsidiaries		166,000,000
Forecast
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Expected Reduction	$ 6,100,000
State
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 905,500,000
Minimum [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Year		2024
Maximum [Member]
Income Tax Contingency [Line Items]
Operating Loss Carryforwards, Expiration Year		2042
UNITED KINGDOM \| Foreign Country Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 117,200,000
GERMANY \| Foreign Country Jurisdiction
Income Tax Contingency [Line Items]
Net operating loss carryforward		$ 39,500,000

ACQUISITIONS AND DIVESTITURES (Tables)

12 Months Ended

Sep. 30, 2023

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition


	Preliminary		Measurement Period		Adjusted Preliminary
	Allocation		Adjustments (2)		Allocation
Assets acquired (excluding cash):
Trade accounts receivable	$	39	$	—	$	39
Inventories	2		—		2
Prepaid expenses and other	40		—		40
Property, plant and equipment	105		278		383
Goodwill	367		(123)		244		(1)
Other intangible assets	243		(151)		92		(1)
Other non-current assets	7		—		7
Total assets acquired (excluding cash)	803		4		807
Liabilities assumed:
Accounts payable	10		(1)		9
Accrued and other current liabilities	50		—		50
Deferred income taxes	8		5		13
Other non-current liabilities	6		—		6
Total liabilities assumed	74		4		78
Net assets acquired	$	729	$	—	$	729


	Preliminary		Measurement Period		Final
	Allocation		Adjustments (2)		Allocation
Assets acquired (excluding cash):
Trade accounts receivable	$	16	$	(2)	$	14
Inventories	33		(1)		32
Prepaid expenses and other	4		—		4
Property, plant and equipment	9		—		9
Goodwill	236		(31)		205		(1)
Other intangible assets	112		36		148		(1)
Other non-current assets	8		9		17
Total assets acquired (excluding cash)	418		11		429
Liabilities assumed:
Accounts payable	4		—		4
Accrued and other current liabilities	11		3		14
Deferred income taxes	35		—		35
Other non-current liabilities	8		9		17
Total liabilities assumed	58		12		70
Net assets acquired	$	360	$	(1)	$	359

(1)None of the approximately $205 million of goodwill and $148 million of other intangible assets recognized for the acquisition is deductible for tax purposes.

(2)Measurement period adjustments primarily related to the adjustments in the fair values of the acquired other intangible assets from the third-party valuation. The offset was to goodwill.

The final allocation of the fair value of assets acquired and liabilities assumed in the CAC acquisition as of the acquisition dates is summarized in the table below (in millions):


	Final
	Allocation
Assets acquired (excluding cash):
Trade accounts receivable	$	32
Inventories	29
Prepaid expenses and other	7
Property, plant and equipment	21
Goodwill	697		(1)
Other intangible assets	324		(1)
Other non-current assets	31
Total assets acquired (excluding cash)	1,141
Liabilities assumed:
Accounts payable	18
Accrued and other current liabilities	44
Deferred income taxes	31
Other non-current liabilities	103
Total liabilities assumed	196
Net assets acquired	$	945

INVENTORIES - Schedule of Inventories (Detail) - USD ($) $ in Millions	Sep. 30, 2023	Sep. 30, 2022
Inventory Disclosure [Abstract]
Raw materials and purchased component parts	$ 1,144	$ 959
Work-in-progress	455	359
Finished goods	226	210
Total	1,825	1,528
Reserves for excess and obsolete inventory	(209)	(196)
Inventories—Net	$ 1,616	$ 1,332

INTANGIBLE ASSETS - Schedule of Intangible Assets Acquired (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 256	$ 259
Intangible assets not subject to amortization	276
Intangible assets subject to amortization	78
intangible Assets, Acquired During the Period	354
Goodwill
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	256
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	20
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 47
Amortization Period (in years)	20 years
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 31
Amortization Period (in years)	20 years

DESCRIPTION OF THE BUSINESS - Narratives (Detail)	Sep. 30, 2023
Transdigm Inc [Member]
Restructuring Cost and Reserve [Line Items]
Percentage of ownership in subsidiary	100.00%

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References + Details

INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 17	$ 19
Additions based on tax positions related to the prior year	4	3
Additions based on tax positions related to the current year	0	0
Reductions based on tax positions related to the prior year	0	(1)
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	3	1
Lapse in statute of limitations	(1)	(3)
Balance at end of period	$ 17	$ 17