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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Sep. 30, 2015	Nov. 03, 2015	Mar. 27, 2015
Document Information [Line Items]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Trading Symbol	TDG
Entity Registrant Name	TRANSDIGM GROUP INC
Entity Central Index Key	0001260221
Current Fiscal Year End Date	--09-30
Entity Well-known Seasoned Issuer	Yes
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		53,687,448
Entity Public Float			$ 10,927,295,559

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
CURRENT ASSETS:
Cash and cash equivalents	$ 714,033	$ 819,548
Trade accounts receivable—Net	444,072	351,307
Inventories—Net	591,401	459,074
Deferred income taxes	45,375	37,669
Prepaid expenses and other	37,081	21,978
Total current assets	1,831,962	1,689,576
PROPERTY, PLANT AND EQUIPMENT—Net	260,684	212,108
GOODWILL	4,686,220	3,525,077
OTHER INTANGIBLE ASSETS—Net	1,539,851	1,217,153
OTHER	108,333	112,934
TOTAL ASSETS	8,427,050	6,756,848
CURRENT LIABILITIES:
Current portion of long-term debt	43,840	39,295
Short-term borrowings—trade receivable securitization facility	200,000	200,000
Accounts payable	142,822	115,741
Accrued liabilities	271,553	230,871
Total current liabilities	658,215	585,907
LONG-TERM DEBT	8,183,502	7,233,836
DEFERRED INCOME TAXES	450,372	402,247
OTHER NON-CURRENT LIABILITIES	173,267	90,957
Total liabilities	9,465,356	8,312,947
STOCKHOLDERS’ DEFICIT:
Common stock—$.01 par value; authorized 224,400,000 shares; issued 55,100,094 and 53,832,246 at September 30, 2015 and 2014, respectively	551	538
Additional paid-in capital	950,324	794,767
Accumulated deficit	(1,717,232)	(2,150,293)
Accumulated other comprehensive loss	(96,009)	(25,171)
Treasury stock, at cost; 1,415,100 shares at September 30, 2015 and 2014, respectively	(175,940)	(175,940)
Total stockholders’ deficit	(1,038,306)	(1,556,099)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	$ 8,427,050	$ 6,756,848

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2015	Sep. 30, 2014
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	224,400,000	224,400,000
Common stock, shares issued	55,100,094	53,832,246
Treasury stock, shares	1,415,100	1,415,100

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
NET SALES	$ 2,707,115	$ 2,372,906	$ 1,924,400
COST OF SALES	1,257,270	1,105,032	874,838
GROSS PROFIT	1,449,845	1,267,874	1,049,562
SELLING AND ADMINISTRATIVE EXPENSES	321,624	276,446	254,468
AMORTIZATION OF INTANGIBLE ASSETS	54,219	63,608	45,639
INCOME FROM OPERATIONS	1,074,002	927,820	749,455
INTEREST EXPENSE—Net	418,785	347,688	270,685
REFINANCING COSTS	18,393	131,622	30,281
INCOME BEFORE INCOME TAXES	636,824	448,510	448,489
INCOME TAX PROVISION	189,612	141,600	145,700
NET INCOME	447,212	306,910	302,789
NET INCOME APPLICABLE TO COMMON STOCK	$ 443,847	$ 180,284	$ 131,546
Net earnings per share:
Basic and diluted (in dollars per share)	$ 7.84	$ 3.16	$ 2.39
Cash dividends paid per common share (in dollars per share)	$ 0	$ 25.00	$ 34.85
Weighted-average shares outstanding:
Basic and diluted (shares)	56,606	56,993	55,080

Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 447,212	$ 306,910	$ 302,789
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(29,448)	(7,653)	4,117
Interest rate swap and cap agreements, net of taxes of $20,716, $3,704, and $1,513 for the fiscal years ended September 30, 2015, 2014, and 2013, respectively.	(35,604)	(6,166)	(3,587)
Pension liability adjustments, net of taxes of $3,299, $2,818, and $(928) for the fiscal years ended September 30, 2015, 2014, and 2013, respectively.	(5,786)	(4,836)	1,005
Other comprehensive (loss) income, net of tax	(70,838)	(18,655)	1,535
TOTAL COMPREHENSIVE INCOME (LOSS)	$ 376,374	$ 288,255	$ 304,324

- Definition

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

+ References + Details

Condensed Consolidated Statements Of Comprehensive Income Parenthetical - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Statement of Comprehensive Income [Abstract]
Interest rate swap and cap agreements tax	$ 20,716	$ 3,704	$ 1,513
Pension liability adjustments tax	$ 3,299	$ 2,818	$ (928)

Consolidated Statement of Changes in Stockholders' (Deficit) Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings / (Accumulated Deficit)	Accumulated Other Comprehensive Loss	Treasury Stock
BALANCE at Sep. 30, 2012	$ 1,218,834	$ 521	$ 553,223	$ 689,229	$ (8,051)	$ (16,088)
BALANCE (in shares) at Sep. 30, 2012		52,157,225				505,400
Dividends paid	(1,950,683)			(1,950,683)
Unvested dividend equivalent payments	(45,579)			(45,579)
Compensation expense recognized for employee stock options	48,884		48,884
Excess tax benefits related to share-based payment arrangements	66,201		66,201
Exercise of employee stock options	21,534	$ 11	21,523
Exercise of employee stock options (in shares)		1,014,613
Common stock issued (in shares)		713
Common stock issued	104		104
Net income	302,789			302,789
Interest rate swaps and caps, net of tax	(3,587)				(3,587)
Foreign currency translation adjustments	4,117				4,117
Pension liability adjustments, net of tax	1,005				1,005
BALANCE at Sep. 30, 2013	(336,381)	$ 532	689,935	(1,004,244)	(6,516)	$ (16,088)
BALANCE (in shares) at Sep. 30, 2013		53,172,551				505,400
Dividends paid	(1,435,154)			(1,435,154)
Unvested dividend equivalent payments	(17,805)			(17,805)
Compensation expense recognized for employee stock options	26,332		26,332
Excess tax benefits related to share-based payment arrangements	51,709		51,709
Exercise of employee stock options	26,738	$ 6	26,732
Exercise of employee stock options (in shares)		659,363
Treasury stock purchased	$ (159,852)					$ (159,852)
Treasury stock purchased (in shares)	(909,700)					(909,700)
Common stock issued (in shares)		332
Common stock issued	$ 59		59
Net income	306,910			306,910
Interest rate swaps and caps, net of tax	(6,166)				(6,166)
Foreign currency translation adjustments	(7,653)				(7,653)
Pension liability adjustments, net of tax	(4,836)				(4,836)
BALANCE at Sep. 30, 2014	$ (1,556,099)	$ 538	794,767	(2,150,293)	(25,171)	$ (175,940)
BALANCE (in shares) at Sep. 30, 2014	53,832,246	53,832,246				1,415,100
Unvested dividend equivalent payments	$ (14,151)			(14,151)
Compensation expense recognized for employee stock options	31,500		31,500
Excess tax benefits related to share-based payment arrangements	61,965		61,965
Exercise of employee stock options	$ 61,687	$ 13	61,674
Exercise of employee stock options (in shares)		1,248,175
Treasury stock purchased (in shares)	0
Common stock issued (in shares)		19,673
Common stock issued	$ 418		418
Net income	447,212			447,212
Interest rate swaps and caps, net of tax	(35,604)				(35,604)
Foreign currency translation adjustments	(29,448)				(29,448)
Pension liability adjustments, net of tax	(5,786)				(5,786)
BALANCE at Sep. 30, 2015	$ (1,038,306)	$ 551	$ 950,324	$ (1,717,232)	$ (96,009)	$ (175,940)
BALANCE (in shares) at Sep. 30, 2015	55,100,094	55,100,094				1,415,100

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
OPERATING ACTIVITIES:
Net income	$ 447,212	$ 306,910	$ 302,789
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	35,939	32,543	27,307
Amortization of intangible assets	57,724	63,842	46,208
Amortization of debt issue costs	15,797	13,935	11,933
Refinancing costs	18,393	131,622	30,281
Net gain on sale of real estate	0	(804)	0
Non-cash equity compensation	31,500	26,332	48,884
Excess tax benefits related to share-based payment arrangements	(61,965)	(51,709)	(66,201)
Deferred income taxes	660	(9,416)	(2,614)
Changes in assets/liabilities, net of effects from acquisitions of businesses:
Trade accounts receivable	(25,418)	(24,309)	(25,006)
Inventories	(25,974)	(8,392)	(15,289)
Income taxes receivable/payable	65,418	56,595	65,510
Other assets	(12,392)	(5,703)	1,155
Accounts payable	13,480	(2,415)	23,510
Accrued and other liabilities	(39,436)	12,191	21,738
Net cash provided by operating activities	520,938	541,222	470,205
INVESTING ACTIVITIES:
Capital expenditures, net of disposals	(54,871)	(34,146)	(35,535)
Acquisition of businesses, net of cash acquired	(1,624,278)	(311,872)	(483,257)
Cash proceeds from sale of real estate	0	16,380	0
Cash proceeds from sale of investment	0	0	16,350
Net cash used in investing activities	(1,679,149)	(329,638)	(502,442)
FINANCING ACTIVITIES:
Excess tax benefits related to share-based payment arrangements	61,965	51,709	66,201
Proceeds from exercise of stock options	61,674	26,738	21,534
Dividends paid	(3,365)	(1,451,391)	(1,991,350)
Treasury stock purchased	0	(159,852)	0
Proceeds from facility	10,281	805,360	3,211,374
Repayment on credit facility	(1,017,988)	(33,107)	(2,187,885)
Proceeds from senior subordinated notes-net	0	2,326,393	1,036,321
Proceeds from trade receivable securitization facility, net	0	199,164	0
Other	(1,266)	(27)	0
Net cash provided by financing activities	1,054,947	43,973	156,195
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	(2,251)	(749)	258
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(105,515)	254,808	124,216
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	819,548	564,740	440,524
CASH AND CASH EQUIVALENTS, END OF PERIOD	714,033	819,548	564,740
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Cash paid during the period for interest	398,939	319,577	236,769
Cash paid during the period for income taxes	127,363	97,798	82,292
2015 Term Loans
FINANCING ACTIVITIES:
Proceeds from facility	1,505,673	0	0
Repayment on credit facility	(7,330)	0	0
Revolving Commitment
FINANCING ACTIVITIES:
Proceeds from facility	75,250	0	0
Repayment on credit facility	(75,250)	0	0
6.50% Senior Subordinated Notes, Due 2025
FINANCING ACTIVITIES:
Proceeds from senior subordinated notes-net	445,303	0	0
7.75% Senior Subordinated Notes, Due 2018
FINANCING ACTIVITIES:
Repurchase of 2018 Notes		$ (1,721,014)	$ 0

DESCRIPTION OF THE BUSINESS	12 Months Ended
DESCRIPTION OF THE BUSINESS	Sep. 30, 2015
Accounting Policies [Abstract]
DESCRIPTION OF THE BUSINESS	DESCRIPTION OF THE BUSINESS Description of the Business—TransDigm 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 all 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 components. 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.” Major product offerings, substantially all of which are ultimately provided to end-users in the aerospace industry, include mechanical/electro-mechanical actuators and controls, ignition systems and engine technology, specialized pumps and valves, power conditioning devices, specialized AC/DC electric motors and generators, NiCad batteries and chargers, engineered latching and locking devices, rods and locking devices, engineered connectors and elastomers, cockpit security components and systems, specialized cockpit displays, aircraft audio systems, specialized lavatory components, seat belts and safety restraints, engineered interior surfaces and related components, lighting and control technology, military personnel parachutes and cargo loading, handling and delivery systems.

ACQUISITIONS

12 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

ACQUISITIONS

During the last three fiscal years, the Company completed the acquisitions of PneuDraulics, Pexco Aerospace, Adams Rite Aerospace GmbH, Telair Cargo Group, EME, Airborne, Whippany Actuation, Arkwin and Aerosonic. The Company accounted for the acquisitions using the acquisition method and included the results of operations of the acquisitions in its consolidated financial statements from the effective date of each acquisition. The Company is in the process of obtaining a third-party valuation of certain tangible and intangible assets of PneuDraulics, Pexco Aerospace, Adams Rite Aerospace GmbH and Telair Cargo Group; therefore, the values attributed to those acquired assets in the consolidated financial statements are subject to adjustment. Pro forma net sales and results of operations for the acquisitions, had they occurred at the beginning of the applicable fiscal year ended September 30, 2015 or 2014, are not significant and, accordingly, are not provided.

The acquisitions 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, improving our cost structure and providing highly engineered value-added products to customers). The purchase price paid for each acquisition reflects the current earnings before interest, taxes, depreciation and amortization (EBITDA) and cash flows, as well as, the future EBITDA and cash flows expected to be generated by the business, 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.

PneuDraulics – On August 19, 2015, TransDigm Inc. acquired PneuDraulics, Inc. (“PneuDraulics”) for approximately $323.5 million in cash. PneuDraulics manufactures proprietary, highly engineered aerospace pneumatic and hydraulic components and subsystems for commercial transport, regional, business jet and military applications. These products fit well with TransDigm’s overall business direction. PneuDraulics is included in TransDigm’s Power & Control segment. The purchase price includes approximately $108.0 million of tax benefits to be realized by the Company over a 15 year period beginning in 2015, and the Company expects that the approximately $190.8 million of goodwill recognized for the acquisition will be deductible for tax purposes.

Pexco Aerospace – On May 14, 2015, Pexco Aerospace, Inc., a newly formed subsidiary of TransDigm Inc., acquired the assets of the aerospace business of Pexco LLC (“Pexco Aerospace”) for a total purchase price of approximately $496.4 million in cash, less a purchase price adjustment of $0.4 million received in the fourth quarter of fiscal 2015. TransDigm Inc. financed the acquisition of Pexco Aerospace through a combination of existing cash on hand and cash proceeds from the issuance of $450.0 million in Senior Subordinated Notes due in May 2025. Pexco Aerospace manufactures extruded plastic interior parts for use in the commercial aerospace industry. These products fit well with TransDigm’s overall business direction. Pexco Aerospace is included in TransDigm’s Airframe segment. The purchase price includes approximately $172.0 million of tax benefits to be realized by TransDigm over a 15 year period beginning in 2015, and the Company expects that the approximately $407.8 million of goodwill recognized for the acquisition will be deductible for tax purposes.

Adams Rite Aerospace GmbH – On March 31, 2015, the Company’s Adams Rite subsidiary acquired the aerospace business of Franke Aquarotter GmbH (now known as Adams Rite Aerospace GmbH) for approximately $75.3 million in cash. Adams Rite Aerospace GmbH manufactures proprietary faucets and related products for use on commercial transports and regional jets. These products fit well with TransDigm’s overall business direction. Adams Rite Aerospace GmbH is included in TransDigm’s Airframe segment. The Company expects that the approximately $63.9 million of goodwill recognized for the acquisition will not be deductible for tax purposes.

Telair Cargo Group – On March 26, 2015, TransDigm Germany GmbH, a subsidiary of TransDigm Inc., acquired all of the outstanding stock of Telair International GmbH ("Telair International"), TransDigm Inc. acquired all of the outstanding stock of Nordisk Aviation Products ("Nordisk") and Telair US LLC, a newly formed subsidiary of TransDigm Inc. ("Telair US"), acquired the assets of the AAR Cargo business (collectively, "Telair Cargo Group"). The total purchase price was approximately $730.9 million in cash, which included a net $7.7 million purchase price adjustment paid in the fourth quarter of fiscal 2015. TransDigm Inc. financed the acquisition of Telair Cargo Group through a combination of existing cash on hand and the borrowing of approximately $75.3 million under its existing revolving credit facility. Telair Cargo Group manufactures aerospace on-board cargo loading and handling, restraint systems and unit load devices for a variety of commercial and military platforms with positions on a wide range of new and existing aircraft. These products fit well with TransDigm’s overall business direction. The business consists of three major operating units: Telair International, Nordisk and Telair US. Telair International and Telair US are included in TransDigm’s Power & Control segment and Nordisk is included in TransDigm’s Airframe segment.

The total purchase price of Telair Cargo Group was allocated to the underlying assets acquired and liabilities assumed based upon management’s estimated fair values at the date of acquisition. To the extent the purchase price exceeded the estimated fair value of the net identifiable tangible and intangible assets acquired, such excess was allocated to goodwill. The following table summarizes the purchase price allocation of the estimated fair values of the assets acquired and liabilities assumed at the transaction date (in thousands).



Assets acquired:
Current assets, excluding cash acquired	$	143,417
Property, plant, and equipment	16,011
Intangible assets	203,860
Goodwill	515,690
Other	1,445
Total assets acquired	$	880,423
Liabilities assumed:
Current liabilities	$	59,008
Other noncurrent liabilities	90,554
Total liabilities assumed	$	149,562
Net assets acquired	$	730,861

The Company expects that approximately $35.1 million of goodwill recognized for the acquisition will be deductible for tax purposes and approximately $480.6 million of goodwill recognized for the acquisition will not be deductible for tax purposes.

EME – On March 6, 2014, TransDigm Germany GmbH, a newly formed subsidiary of TransDigm Inc., acquired Elektro-Metall Export GmbH (“EME”) for approximately $49.6 million, which comprises $40.4 million in cash plus the assumption of approximately $9.2 million of net indebtedness. EME manufactures proprietary, highly engineered aerospace electromechanical actuators, electrical and electromechanical components and assemblies for commercial aircraft, helicopters and other specialty applications. These products fit well with TransDigm’s overall business direction. EME is included in TransDigm’s Airframe segment. Approximately $20.3 million of goodwill recognized for the acquisition is not deductible for tax purposes.

Airborne – On December 19, 2013, TransDigm Inc. acquired all of the outstanding stock of Airborne Global Inc. (“Airborne”) for approximately $264.2 million in cash. Airborne manufactures personnel parachutes, cargo aerial delivery systems, emergency escape systems, naval decoys and other related products. These products fit well with TransDigm’s overall business direction. Airborne is included in TransDigm’s Airframe segment. Approximately $158.2 million of goodwill recognized for the acquisition is not deductible for tax purposes.

Whippany Actuation – On June 28, 2013, Whippany Actuation Systems, LLC, a newly formed subsidiary of TransDigm Inc., acquired assets from GE Aviation’s Electromechanical Actuation Division (“Whippany Actuation”) for approximately $151.5 million in cash. Whippany Actuation manufactures proprietary, highly engineered aerospace electromechanical motion control subsystems for civil and military applications, with product offerings including control electronics, motors, high power mechanical transmissions and actuators. These products fit well with TransDigm’s overall business direction. Whippany is included in TransDigm’s Power & Control segment. Approximately $105.1 million of goodwill recognized for the acquisition is deductible for tax purposes.

Arkwin – On June 5, 2013, TransDigm Inc. acquired all of the outstanding stock of Arkwin Industries, Inc. (“Arkwin”), for approximately $285.7 million in cash. Arkwin manufactures proprietary, highly engineered aerospace hydraulic and fuel system components for commercial and military aircraft, helicopters and other specialty applications. These products fit well with TransDigm’s overall business direction. Arkwin is included in TransDigm’s Power & Control segment. Approximately $184.9 million of goodwill recognized for the acquisition is not deductible for tax purposes.

Aerosonic – On June 5, 2013, Buccaneer Acquisition Sub Inc., a newly formed subsidiary of TransDigm Inc., completed the tender offer of a majority of the outstanding stock of Aerosonic Corporation (“Aerosonic”). Buccaneer Acquisition Sub Inc. was subsequently merged into Aerosonic on June 10, 2013; in connection therewith, all outstanding shares of Aerosonic were cancelled and Aerosonic became a wholly owned subsidiary of TransDigm Inc. The aggregate price paid in the tender offer and merger was approximately $39.8 million in cash. Aerosonic manufactures proprietary, highly engineered mechanical and digital altimeters, airspeed indicators, rate of climb indicators, microprocessor controlled air data test sets, angle of attack stall warning systems, integrated air data sensors and other aircraft sensors, monitoring systems and flight instrumentation for use on commercial and military aircraft. These products fit well with TransDigm’s overall business direction. Aerosonic is included in TransDigm’s Power & Control segment. Approximately $14.8 million of goodwill recognized for the acquisition is not deductible for tax purposes.

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

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+ Details

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	Sep. 30, 2015
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 generally accepted accounting principles in the United States (“GAAP”) and include the accounts of TD Group and subsidiaries. All significant intercompany balances and transactions have been eliminated. Certain reclassifications have been made to the prior year financial statements to conform to current year presentation related to organizational realignments effective October 1, 2014 of the businesses comprising the Power & Control and the Airframe segments. Revenue Recognition and Related Allowances—Revenue is recognized from the sale of products when title and risk of loss passes to the customer, which is generally at the time of shipment. Substantially all product sales are made pursuant to firm, fixed-price purchase orders received from customers. Provisions for estimated returns, uncollectible accounts and the cost of repairs under contract warranty provisions are provided for in the same period as the related revenues are recorded and are principally based on historical results modified, as appropriate, by the most current information available. Due to uncertainties in the estimation process, it is possible that actual results may vary from the estimates. 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 years ended September 30, 2015, 2014 and 2013 was approximately $48.3 million, $42.3 million, and $32.1 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. Allowance for Uncollectible Accounts—The Company reserves for amounts determined to be uncollectible based on specific identification of losses and estimated losses based on historical experience. The allowance also incorporates a provision for the estimated impact of disputes with customers. The determination of the amount of the allowance for doubtful accounts is subject to significant levels of judgment and estimation by management. If circumstances change or economic conditions deteriorate or improve, the allowance for doubtful accounts could increase or decrease. Inventories—Inventories are stated at the lower of cost or market. 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. In accordance with industry practice, all inventories are classified as current assets even though a portion of the inventories may not be sold within one year. 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 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. 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. 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. Debt Issue 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/securities. Intangible Assets—Intangible assets consist of identifiable intangibles acquired or recognized in accounting for the acquisitions (trademarks, trade names, technology, order backlog and other intangible assets) and goodwill. 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. 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 current value. A two-step impairment test is used to identify potential goodwill impairment. The first step of the goodwill impairment test, used to identify potential impairment, compares the fair value of a reporting unit (as defined) with its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying amount, goodwill is not considered impaired, and the second step of the goodwill impairment test is unnecessary. The second step measures the amount of impairment, if any, by comparing the carrying value of the goodwill associated with a reporting unit to the implied fair value of the goodwill derived from the estimated overall fair value of the reporting unit and the individual fair values of the other assets and liabilities of the reporting unit. GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. The reporting unit level is one level below an operating segment. 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 assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the amortization over their remaining lives can be recovered through projected, undiscounted cash flows from future operations. Amortization of amortizable intangible assets is computed using the straight-line method over the following estimated useful lives: technology from 20 to 22 years, order backlog over one year, and other intangible assets over 20 years. Stock-Based Compensation—The Company records stock-based compensation expense using the fair value method of accounting. Compensation expense is recorded over the vesting periods of the stock options, restricted stock and other stock-based incentives. No expense is recognized for any stock options, restricted stock and other stock-based incentives ultimately forfeited because the recipients fail to meet vesting requirements. Income Taxes—The Company accounts for income taxes using an asset and liability approach. Deferred taxes are recorded for the difference between the book and tax basis of various assets and liabilities. A valuation allowance is provided when it is more likely than not that some or all of a deferred tax asset will not be realized. 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. Estimates—The preparation of financial statements in conformity with 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. 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 and cap 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 are accumulated as a separate component of other comprehensive income (loss) for the period. Foreign currency gains or losses recognized currently in income from changes in exchange rates were not material to our results of operations. 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 dividends (“participating securities”). Our vested and unvested stock options are considered “participating securities” because they include non-forfeitable rights to dividends. In applying the two-class method, earnings are allocated to both common stock 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.

RECENT ACCOUNTING PRONOUNCEMENTS	12 Months Ended
RECENT ACCOUNTING PRONOUNCEMENTS	Sep. 30, 2015
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
RECENT ACCOUNTING PRONOUNCEMENTS	RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09 which creates a new topic in the Accounting Standards Codification (“ASC”) Topic 606, “Revenue From Contracts With Customers.” In addition to superseding and replacing nearly all existing U.S. GAAP revenue recognition guidance, including industry-specific guidance, ASC 606 establishes a new control-based revenue recognition model; changes the basis for deciding when revenue is recognized over time or at a point in time; provides new and more detailed guidance on specific topics; and expands and improves disclosures about revenue. The guidance is effective for the Company for annual reporting periods, including interim periods therein, beginning October 1, 2018. The Company is currently evaluating the impact that the update will have on its financial position, results of operations, cash flows and financial statement disclosures. In April 2015, the FASB issued ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs,” which expands upon the guidance on the presentation of debt issuance costs. The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts. The guidance does not change the current requirements surrounding the recognition and measurement of debt issuance costs, and the amortization of debt issuance costs will continue to be reported as interest expense. The guidance is effective for the Company beginning October 1, 2016. Early adoption is allowed for all entities and the new guidance shall be applied to all prior periods retrospectively. We do not expect the adoption of this guidance to have a significant impact on our consolidated financial position and results of operations, although it will change the financial statement classification of debt issue costs. As of September 30, 2015 and 2014, we had $77.7 million and $92.4 million in debt issue costs recorded as an asset on the Consolidated Balance Sheets, respectively. Under the new guidance, the debt issue costs would offset the carrying amount of the respective debt on the Consolidated Balance Sheets.

EARNINGS PER SHARE (TWO-CLASS METHOD)

12 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

EARNINGS PER SHARE (TWO-CLASS METHOD)

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):



	Fiscal Years Ended September 30,
	2015			2014			2013
Numerator for earnings per share:
Net income	$	447,212		$	306,910		$	302,789
Less dividends paid on participating securities	(3,365		)	(126,626		)	(171,243		)
Net income applicable to common stock—basic and diluted	$	443,847		$	180,284		$	131,546
Denominator for basic and diluted earnings per share under the two-class method:
Weighted average common shares outstanding	53,112			52,748			52,258
Vested options deemed participating securities	3,494			4,245			2,822
Total shares for basic and diluted earnings per share	56,606			56,993			55,080
Net earnings per share—basic and diluted	$	7.84		$	3.16		$	2.39

SALES AND TRADE ACCOUNTS RECEIVABLE

12 Months Ended

Sep. 30, 2015

Receivables [Abstract]

SALES AND TRADE ACCOUNTS RECEIVABLE

Sales—The Company’s sales and receivables are concentrated in the aerospace industry. TransDigm’s customers include: distributors of aerospace components; commercial airlines, large commercial transport and regional and business aircraft OEMs; various armed forces of the United States and friendly foreign governments; defense OEMs; system suppliers; and various other industrial customers.

Two customers accounted for approximately 12%, 12% and 13% and 11%, 8% and 8% of the Company’s net sales for fiscal years ended 2015, 2014 and 2013, respectively. Sales to these customers were split approximately evenly between the Power & Control and Airframe segments. Sales to foreign customers, primarily in Western Europe, Canada and Asia, were $881.1 million, $735.9 million and $572.0 million during fiscal years ended 2015, 2014 and 2013.

Trade Accounts Receivable—Trade accounts receivable consist of the following at September 30 (in thousands):



	2015			2014
Trade accounts receivable—gross	$	447,873		$	355,398
Allowance for uncollectible accounts	(3,801		)	(4,091		)
Trade accounts receivable—net	$	444,072		$	351,307

At September 30, 2015, approximately 14% of the Company’s trade accounts receivable was due from one customer. In addition, approximately 44% of the Company’s trade accounts receivable was due from entities that principally operate outside of the United States. Credit is extended based on an evaluation of each customer’s financial condition and collateral is generally not required.

- Definition

The entire disclosure for claims held for amounts due a entity, excluding financing receivables. Examples include, but are not limited to, trade accounts receivables, notes receivables, loans receivables. Includes disclosure for allowance for credit losses.

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INVENTORIES

12 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

INVENTORIES

Inventories consist of the following at September 30 (in thousands):



	2015			2014
Raw materials and purchased component parts	$	371,073		$	298,318
Work-in-progress	164,793			146,980
Finished Goods	122,956			69,658
Total	658,822			514,956
Reserves for excess and obsolete inventory and LIFO	(67,421		)	(55,882		)
Inventories—net	$	591,401		$	459,074

PROPERTY, PLANT AND EQUIPMENT

12 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

PROPERTY, PLANT AND EQUIPMENT

8. PROPERTY, PLANT AND EQUIPMENT

Property, plant and equipment consist of the following at September 30 (in thousands):



	2015			2014
Land and improvements	$	42,235		$	33,722
Buildings and improvements	133,290			114,030
Machinery, equipment and other	283,670			235,642
Construction in progress	20,867			12,174
Total	480,062			395,568
Accumulated depreciation	(219,378		)	(183,460		)
Property, plant and equipment—net	$	260,684		$	212,108

INTANGIBLE ASSETS

12 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

INTANGIBLE ASSETS

Intangible assets subject to amortization consist of the following at September 30 (in thousands):



	2015						2014
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Technology	$	1,100,317	$	233,434	$	866,883	$	854,918	$	186,278	$	668,640
Order backlog	19,501		10,709		8,792		8,006		6,006		2,000
Other	43,229		13,557		29,672		43,252		11,259		31,993
Total	$	1,163,047	$	257,700	$	905,347	$	906,176	$	203,543	$	702,633

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

Aggregate Amortization Expense:



Years ended September 30,
2015	$	54,219
2014	63,842
2013	46,208

Estimated Amortization Expense:



Years ending September 30,
2016	$	66,355
2017	57,562
2018	57,562
2019	57,562
2020	57,562

Intangible assets acquired during the year ended September 30, 2015 were as follows (in thousands):



	Gross Amount		Amortization Period
Intangible assets not subject to amortization:
Goodwill	$	1,178,264
Trademarks and trade names	123,851
	1,302,115
Intangible assets subject to amortization:
Technology	248,193		20 years
Order backlog	11,529		1 year
	259,722		19.2 years
Total	$	1,561,837

The changes in the carrying amount of goodwill by segment for the fiscal years ended September 30, 2014 and 2015 were as follows (in thousands):



	Power & Control		Airframe			Non- aviation		Total
Balance at September 30, 2013	$	1,554,308	$	1,734,519		$	55,080	$	3,343,907
Goodwill acquired during the year (Note 2)	—		178,514			—		178,514
Purchase price allocation adjustments	5,999		—			289		6,288
Other	3,140		(6,772		)	—		(3,632		)
Balance at September 30, 2014	1,563,447		1,906,261			55,369		3,525,077
Goodwill acquired during the year (Note 2)	674,123		504,141			—		1,178,264
Purchase price allocation adjustments	—		(4,541		)	—		(4,541		)
Other	873		(13,453		)	—		(12,580		)
Balance at September 30, 2015	$	2,238,443	$	2,392,408		$	55,369	$	4,686,220

ACCRUED LIABILITIES

12 Months Ended

Sep. 30, 2015

Payables and Accruals [Abstract]

ACCRUED LIABILITIES

Accrued liabilities consist of the following at September 30 (in thousands):



	2015		2014
Interest	$	65,247	$	69,523
Compensation and related benefits	68,034		63,057
Interest rate swap agreements	24,770		20,070
Product warranties	20,592		14,243
Other	92,910		63,978
Total	$	271,553	$	230,871

DEBT

12 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

DEBT

The Company’s debt consists of the following at September 30 (in thousands):



	2015		2014
Short-term borrowings—trade receivable securitization facility	$	200,000	$	200,000
Term loans	$	4,377,342	$	3,873,131
2020 Notes	550,000		550,000
2021 Notes	500,000		500,000
2022 Notes	1,150,000		1,150,000
2024 Notes	1,200,000		1,200,000
2025 Notes	450,000		—
	8,227,342		7,273,131
Less current portion	43,840		39,295
Long-term debt	$	8,183,502	$	7,233,836

Trade Receivable Securitization Facility—During fiscal 2014, the Company established a trade receivable securitization facility (the “Securitization Facility”). The Securitization Facility effectively increases the Company’s borrowing capacity depending on the amount of 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. In August 2015, the Company increased the borrowing capacity from $225 million to $250 million in connection with amending the Securitization Facility to a maturity date of August 2, 2016. As of September 30, 2015, the Company has borrowed $200 million under the Securitization Facility. The Securitization Facility is collateralized by substantially all of the Company’s trade accounts receivable.

Repurchase of 2018 Notes—On May 9, 2014, the Company announced a cash tender offer for any and all of its outstanding 2018 Notes. In June 2014, the Company repurchased or discharged all the 2018 Notes for an aggregate price of $1,721 million.

Second Amended and Restated Credit Agreement—On June 4, 2014, TransDigm Inc. amended and restated its existing credit agreement dated February 28, 2013, by entering into a Second Amended and Restated Credit Agreement. The Second Amended and Restated Credit Agreement permits, among other things, (i) the payment of a special dividend of up to $1,700 million to the holders of TD Group’s common stock, par value $.01 per share, (ii) the issuance of the 2022 Notes and the 2024 Notes (each as defined below), (iii) the incurrence of certain new tranche D term loans (the “Tranche D Term Loans”) in an aggregate principal amount equal to $825 million, which Tranche D Term Loans were fully drawn on June 4, 2014 and mature on June 4, 2021, (iv) the increase of the total revolving commitments thereunder to $420 million, which includes a sub-limit of up to $100 million of multi-currency revolving commitments, and (v) certain changes to certain affirmative and negative covenants and the financial covenant thereunder. The terms and conditions that apply to the Tranche D Term Loans, including pricing, are substantially the same as the terms and conditions that apply to the other term loans. In addition, the Revolving A credit commitments previously available under the credit facility were terminated.

The term loans under the Second Amended and Restated Credit Agreement (the "2014 Term Loans") consisted of three tranches of term loans—Tranche B Term Loans, Tranche C Term Loans and the Tranche D Term Loans. The revolving credit facility consisted of one tranche—Revolving B Commitments, which included up to $100 million of multi-currency revolving commitments. The Tranche B Term Loans consisted of $500 million in the aggregate; however, the Tranche B Term Loans were refinanced in May 2015 in connection with the financing of the Tranche E Term Loans. The May 2015 financing is detailed in the "Incremental Assumption and Refinancing Facility Agreement" section below. The Tranche C Term Loans consist of $2,600 million in the aggregate maturing on February 28, 2020 and the Tranche D Term Loans consist of $825 million in the aggregate maturing on June 4, 2021. Subsequent to the May 2015 financing and resulting impact on the term loan facility, quarterly principal payments of $7.3 million on the term loans are required, which began on June 30, 2015. Prior to the May 2015 financing, quarterly principal payments of $7.8 million were due beginning March 28, 2013 and an additional quarterly principal payment of $2.1 million was due beginning September 30, 2014. The Revolving B Commitments of $420 million, which included a sub-limit of up to $100 million of multi-currency revolving commitments, were also refinanced in May 2015 as detailed in the "Incremental Assumption and Refinancing Facility Agreement" section below.

Under the terms of the Second Amended and Restated Credit Agreement, TransDigm is entitled on one or more occasions, subject to the satisfaction of certain conditions, to request additional commitments under the revolving credit facility or additional term loans in the aggregate principal amount of up to $1,000 million to the extent that existing or new lenders agree to provide such additional term loans. All of the indebtedness outstanding under the 2014 Term Loans is guaranteed by TD Group and all of TransDigm’s current and future domestic restricted subsidiaries (other than immaterial subsidiaries). In addition, the obligations of TransDigm and the guarantors under the 2014 Term Loans are secured ratably in accordance with each lender’s respective revolving and term loan commitments by a first priority security interest in substantially all of the existing and future property and assets, including inventory, equipment, general intangibles, intellectual property, investment property and other personal property (but excluding leasehold interests and certain other assets) of TransDigm and its existing and future domestic restricted subsidiaries (other than immaterial subsidiaries), and a first priority pledge of the capital stock of TransDigm and its subsidiaries (other than foreign subsidiaries and certain domestic subsidiaries, of which 65% of the voting capital stock is pledged).

The interest rates per annum applicable to the 2014 Term Loans are, at TransDigm’s option, equal to either an alternate base rate or an adjusted LIBOR for one, two, three or six-month (or to the extent agreed to by each relevant lender, nine or twelve-month) interest periods chosen by TransDigm, in each case plus an applicable margin percentage. The adjusted LIBOR is subject to a floor of 0.75%. At September 30, 2015, the applicable interest rate was 3.75% on the Tranche C and Tranche D Term Loans.

The term loan facility requires mandatory prepayments of principal based on certain percentages of Excess Cash Flow (as defined in the 2014 Term Loans), commencing 90 days after the end of each fiscal year, commencing with the fiscal year ended September 30, 2014, subject to certain exceptions. In addition, subject to certain exceptions (including, with respect to asset sales, the reinvestment in productive assets), TransDigm will be required to prepay the loans outstanding under the term loan facility at 100% of the principal amount thereof, plus accrued and unpaid interest, with the net cash proceeds of certain asset sales and issuance or incurrence of certain indebtedness. No prepayments were required for fiscal 2015.

The Second Amended and Restated Credit Agreement contains certain covenants that limit the ability of TD Group, TransDigm and TransDigm’s restricted subsidiaries to, among other things: (i) incur or guarantee additional indebtedness or issue preferred stock; (ii) pay distributions on, redeem or repurchase capital stock or redeem or repurchase subordinated debt; (iii) make investments; (iv) sell assets; (v) enter into agreements that restrict distributions or other payments from restricted subsidiaries to TransDigm; (vi) incur or suffer to exist liens securing indebtedness; (vii) consolidate, merge or transfer all or substantially all of their assets; and (viii) engage in transactions with affiliates.

At September 30, 2015, five forward-starting interest rate swap agreements beginning March 31, 2016 were in place to hedge the variable interest rates on the 2014 Term Loans for a fixed rate based on an aggregate notional amount of $750 million through June 30, 2020. These forward-starting interest rate swap agreements will effectively convert the variable interest rate on the aggregate notional amount of the 2014 Term Loans to a fixed rate of 5.8% (2.8% plus the 3% margin percentage) over the term of the interest rate swap agreements.

At September 30, 2015, three interest rate swap agreements beginning September 30, 2014 were in place to hedge the variable interest rates on the 2014 Term Loans for a fixed rate based on an aggregate notional amount of $1,000 million through June 30, 2019. These interest rate swap agreements converted the variable interest rate on the aggregate notional amount of the 2014 Term Loans to a fixed rate of 5.4% (2.4% plus the 3% margin percentage) over the term of the interest rate swap agreements.

During the fiscal year ended September 30, 2015, three interest rate swap agreements were in place to swap variable rates on the 2014 Term Loans for a fixed rate based on an aggregate notional amount of $353 million through June 30, 2015. These interest rate swap agreements converted the variable interest rate on the aggregate notional amount of the 2014 Term Loans to a fixed rate of 5.2% (2.2% plus the 3% margin percentage) over the term of the interest rate swap agreements.

Incremental Assumption and Refinancing Facility Agreement—On May 14, 2015, TransDigm Inc., TD Group and certain subsidiaries of TransDigm entered into an Incremental Assumption and Refinancing Facility Agreement (the “2015 Term Loans”) with Credit Suisse AG, as administrative agent and collateral agent, and the other agents and lenders named therein. Pursuant to the Incremental Assumption and Refinancing Facility Agreement, TransDigm, among other things, incurred new tranche E term loans (the “New Tranche E Term Loans”) in an aggregate principal amount equal to $1,000 million and refinanced the existing Tranche B Term Loans in an aggregate principal amount equal to $498 million into additional Tranche E Term Loans (together with the New Tranche E Term Loans, the “Tranche E Term Loans”). The Tranche E Term Loans were fully drawn on May 14, 2015 and mature on May 14, 2022. The terms and conditions (other than maturity date) that applied to the Tranche E Term Loans, including pricing, are substantially the same as the terms and conditions that apply to the Tranche B Term Loans immediately prior to the Assumption and Refinancing Agreement under the Second Amended and Restated Credit Agreement. The 2015 Term Loans require quarterly principal payments of $3.7 million, which began on June 30, 2015. At September 30, 2015, the unamortized original issue discount on the Tranche E Terms Loans was $5.4 million.

The interest rates per annum applicable to the 2015 Term Loans are, at TransDigm’s option, equal to either an alternate base rate or an adjusted LIBOR for one, two, three or six-month (or to the extent agreed to by each relevant lender, nine or twelve-month) interest periods chosen by TransDigm, in each case plus an applicable margin percentage. The adjusted LIBOR is subject to a floor of 0.75%. At September 30, 2015, the applicable interest rate was 3.50% on the Tranche E Term Loans.

In addition, if, prior to November 14, 2015, the principal amount of the Tranche E Term Loans is (i) prepaid substantially concurrently with the incurrence by TD Group, TransDigm or any its subsidiaries of new bank loans that have an effective yield lower than the yield in effect on the term loans so prepaid or (ii) received by a lender due to a mandatory assignment following the failure of such lender to consent to an amendment of the 2015 Term Loans that has the effect of reducing the effective interest rate with respect to the term loans, then such prepayment or receipt shall be accompanied by a premium of 1.0%.

At September 30, 2015, six interest rate cap agreements beginning September 30, 2015 were in place to offset the variable interest rates on the 2015 Term Loans based on an aggregate notional amount of $750 million. These interest rate cap agreements offset the variability in expected future cash flows on the Company's variable rate debt attributable to fluctuations above the three month LIBOR of 2.5% through June 30, 2020.

Incremental Revolving Assumption—On May 20, 2015, TransDigm, TD Group and the subsidiaries of TransDigm named therein entered into an Incremental Revolving Credit Assumption and Refinancing Facility Agreement. Pursuant to the Incremental Revolving Credit Assumption and Refinancing Facility Agreement, TransDigm, among other things, increased the revolving commitments under the Second Amended and Restated Credit Agreement in an aggregate principal amount of $130 million (the “New Revolving Commitments”) and refinanced a portion of the existing Tranche C Term Loans into the Tranche E Term Loans (the “Refinanced Tranche C Term Loans”). The terms and conditions that apply to the New Revolving Commitments are the same as those of the existing US Dollar revolving credit commitments under the Second Amended and Restated Credit Agreement. The terms and conditions that apply to the Refinanced Tranche C Term Loans are the same as those of the Tranche E Term Loans. The New Revolving Commitments consist of $550 million in the aggregate and mature on February 28, 2018. At September 30, 2015, the Company had $16 million letters of credit outstanding and $534 million of borrowings available under the New Revolving Commitments.

During the year ended September 30, 2015, the Company recorded refinancing costs of $18.4 million representing debt issue costs expensed in conjunction with the refinancing of the 2014 Term Loans and Revolving B Commitments. During the year ended September 30, 2014 the Company recorded refinancing costs of $131.6 million representing debt issue costs expensed in conjunction with the repurchase of the 2018 Notes. The charge consisted of the premium of $121.1 million paid to redeem the 2018 Notes and the write-off of debt issue costs of $10.5 million. During the year ended September 30, 2013 the Company recorded refinancing costs of $30.3 million representing debt issue costs expensed in conjunction with the refinancing of our previous credit facilities.

Senior Subordinated Notes—On October 15, 2012, TransDigm Inc. issued $550 million in aggregate principal amount of its 2020 Notes at an issue price of 100% of the principal amount. The 2020 Notes bear interest at the rate of 5.50% per annum, which accrues from October 15, 2012 and is payable semiannually on April 15 and October 15 of each year. The 2020 Notes mature on October 15, 2020, unless earlier redeemed or repurchased, and are subject to the terms and conditions as defined in the indenture governing the 2020 Notes.

On July 1, 2013, TransDigm issued $500 million in aggregate principal amount of its 2021 Notes at an issue price of 100% of the principal amount. The 2021 Notes bear interest at the rate of 7.50% per annum, which accrues from July 1, 2013 and is payable semiannually on January 15 and July 15 of each year, commencing on January 15, 2014. The 2021 Notes mature on July 15, 2021, unless earlier redeemed or repurchased, and are subject to the terms and conditions as defined in the indenture governing the 2021 Notes.

On June 4, 2014, TransDigm Inc. issued $2,350 million in aggregate principal amount of Senior Subordinated Notes, consisting of $1,150 million aggregate principal amount of the 2022 Notes and $1,200 million aggregate principal amount of the 2024 Notes at an issue price of 100% of the principal amount for both notes. The 2022 Notes bear interest at the rate of 6.00% per annum, which accrues from June 4, 2014 and is payable semiannually in arrears on January 15 and July 15 of each year, commencing on January 15, 2015. The 2022 Notes mature on July 15, 2022, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the indenture governing the 2022 Notes. The 2024 Notes bear interest at the rate of 6.50% per annum, which accrues from June 4, 2014 and is payable semiannually in arrears on January 15 and July 15 of each year, commencing on January 15, 2015. The 2024 Notes mature on July 15, 2024, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the indenture governing the 2024 Notes.

On May 14, 2015, TransDigm Inc. issued $450 million in aggregate principal amount of its 2025 Notes (together with the 2020 Notes, the 2021 Notes, the 2022 Notes and the 2024 Notes, the “Notes”) at an issue price of 100% of the principal amount. The 2025 Notes bear interest at the rate of 6.50% per annum, which accrues from May 14, 2015 and is payable semiannually in arrears on May 15 and November 15 of each year, commencing on November 15, 2015. The 2025 Notes mature on May 15, 2025, unless earlier redeemed or repurchased, and are subject to the terms and conditions set forth in the indenture governing the 2025 Notes.

The Notes are subordinated to all of TransDigm’s existing and future senior debt, rank equally with all of its existing and future senior subordinated debt and rank senior to all of its future debt that is expressly subordinated to the Notes. The Notes are guaranteed on a senior subordinated unsecured basis by TD Group and its wholly-owned domestic subsidiaries named in the indentures. The guarantees of the Notes are subordinated to all of the guarantors’ existing and future senior debt, rank equally with all of their existing and future senior subordinated debt and rank senior to all of their future debt that is expressly subordinated to the guarantees of the Notes. The Notes are structurally subordinated to all of the liabilities of TD Group’s non-guarantor subsidiaries. The Notes contain many of the restrictive covenants included in the 2014 Term Loans. TransDigm is in compliance with all the covenants contained in the Notes.

At September 30, 2015, future maturities of long-term debt are as follows (in thousands):




Years ended September 30,
2016	$	43,840
2017	43,840
2018	43,840
2019	43,840
2020	2,524,647
Thereafter	5,532,806
	$	8,232,813

RETIREMENT PLANS	12 Months Ended
RETIREMENT PLANS	Sep. 30, 2015
Postemployment Benefits [Abstract]
RETIREMENT PLANS	RETIREMENT PLANS Defined Contribution Plans—The Company sponsors certain defined contribution employee savings plans that cover substantially all of the Company’s non-union 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 years ended September 30, 2015, 2014 and 2013 was approximately $9.9 million, $8.7 million and $6.6 million, respectively. Defined Benefit Pension Plans—The Company maintains certain non-contributory defined benefit pension plans. The Company’s funding policy is to contribute actuarially determined amounts allowable under Internal Revenue Service regulations for the qualified plans. The Company uses a September 30th measurement date for its defined benefit pension plans. The Company maintains certain qualified, non-contributory defined benefit pension plans, which together cover certain union employees. The plans provide benefits of stated amounts for each year of service. The plan assets as of September 30, 2015 and 2014 were approximately $65.5 million and $69.5 million, respectively. The Company’s projected benefit obligation for these defined benefit pension plans at September 30, 2015 and 2014 was $81.5 million and $77.6 million, respectively. The total liability recognized at September 30, 2015 and 2014 was $16.0 million and $8.1 million, respectively. The net periodic pension cost recognized in the Consolidated Statements of Income for the years ended September 30, 2015, 2014, and 2013 was $0.6 million, $0.5 million, and $0.8 million, respectively. The Company has a non-qualified, non-contributory defined benefit pension plan, which covers certain retired employees. The plan is unfunded and provides defined benefits based on the final average salary of the employees as defined in the plan. The projected benefit obligation for this defined benefit pension plan and the total liability recognized in the Consolidated Balance Sheet at September 30, 2015 and 2014 was approximately $8.4 million and $9.0 million, respectively. The net periodic pension cost recognized in the Consolidated Statements of Income for each of the years ended September 30, 2015, 2014 and 2013 was $0.4 million.

INCOME TAXES

12 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

INCOME TAXES

The Company’s income tax provision on income before income taxes consists of the following for the periods shown below (in thousands):



	Fiscal Years Ended September 30,
	2015		2014			2013
Current
Federal	$	163,182	$	138,596		$	133,438
State	7,823		7,807			8,933
Foreign	17,947		4,613			5,943
	188,952		151,016			148,314
Deferred	660		(9,416		)	(2,614		)
	$	189,612	$	141,600		$	145,700

The differences between the income tax provision on income before income taxes at the federal statutory income tax rate and the tax provision shown in the accompanying consolidated statements of income for the periods shown below are as follows (in thousands):



	Fiscal Years Ended September 30,
	2015			2014			2013
Tax at statutory rate of 35%	$	222,888		$	156,979		$	156,970
State and local income taxes, net of federal benefit	4,931			5,658			4,858
Domestic manufacturing deduction	(17,834		)	(13,980		)	(14,388		)
Foreign rate differential	(14,332		)	(4,034		)	(2,551		)
Other—net	(6,041		)	(3,023		)	811
Income tax provision	$	189,612		$	141,600		$	145,700

The components of the deferred taxes consist of the following at September 30 (in thousands):



	2015			2014
Deferred tax assets:
Employee benefits, compensation and other accrued obligations	$	65,245		$	60,457
Inventory	22,047			19,610
Net operating losses	15,945			16,345
Tax credits	2,230			11,343
Interest rate swaps and caps	29,811			9,258
Environmental	7,897			8,380
Product warranties	6,247			5,046
Other	5,952			2,364
Total	155,374			132,803
Less: Valuation allowance	(17,645		)	(24,267		)
Total deferred tax assets	137,729			108,536
Deferred tax liabilities:
Intangible assets	508,485			444,059
Property, plant and equipment	21,083			19,348
Unremitted foreign earnings	7,178			4,918
Other	5,980			4,789
Total deferred tax liabilities	542,726			473,114
Total net deferred tax liabilities	$	404,997		$	364,578

At September 30, 2015, the Company has United Kingdom net operating loss carryforwards of approximately $24.9 million and state net operating loss carryforwards of approximately $268 million that expire in various years from 2015 to 2032. A valuation allowance has been established equal to the amount of the net operating losses that the Company believes will not be utilized. The Company had foreign tax credit carryforwards which generate a tax benefit of approximately $0.4 million that expire from 2018 to 2022. The Company had state tax credit carryforwards of $1.8 million that expire from 2023 to 2029.

The Company and its subsidiaries file income tax returns in the U.S. federal jurisdiction and various state and local jurisdictions, as well as foreign jurisdictions located in Belgium, Canada, China, France, Germany, Hong Kong, Hungary, Malaysia, Mexico, Norway, Singapore, Sri Lanka, Sweden and the United Kingdom. The Company is no longer subject to U.S. federal examinations for years before fiscal 2013. The Company is currently under examination in Belgium for its fiscal 2013 and 2014 years and expects the examinations to be completed during fiscal 2016. In addition, the Company is subject to state income tax examinations for fiscal years 2009 and later.

The cumulative amount of the Company’s foreign undistributed net earnings for which no deferred taxes have been provided is approximately $39.5 million at September 30, 2015. The Company has no plans to repatriate such earnings in the foreseeable future.

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



	2015			2014
Balance at beginning of period	$	13,951		$	6,129
Additions based on tax positions related to the prior year	1,304			990
Additions based on tax positions related to the current year	—			886
Reductions based on tax positions related to the prior year	(2,099		)	—
Settlement with tax authorities	(957		)	—
Lapse in statute of limitations	(3,645		)	(1,139		)
Acquisitions	(1,695		)	7,085
Balance at end of period	$	6,859		$	13,951

Unrecognized tax benefits at September 30, 2015 and 2014, the recognition of which would have an effect on the effective tax rate for each fiscal year, amounted to $6.5 million and $13.5 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, 2015, 2014 and 2013. As of September 30, 2015 and 2014, the Company accrued $1.4 million and $2.9 million, respectively, for the potential payment of interest and penalties. The Company anticipates no significant changes to its total unrecognized tax benefits through fiscal 2015.

ENVIRONMENTAL LIABILITIES	12 Months Ended
ENVIRONMENTAL LIABILITIES	Sep. 30, 2015
Environmental Remediation Obligations [Abstract]
ENVIRONMENTAL LIABILITIES	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. 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 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 reduced 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 sheet includes environmental remediation obligations at September 30, 2015 and 2014 of $21.9 million and $23.3 million, respectively.

CAPITAL STOCK	12 Months Ended
CAPITAL STOCK	Sep. 30, 2015
Equity [Abstract]
CAPITAL STOCK	15. CAPITAL STOCK Authorized capital stock of TD 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, 2015 and 2014 was 55,100,094 and 53,832,246, respectively. There were no shares of preferred stock outstanding at September 30, 2015 and 2014. The terms of the preferred stock have not been established. On October 22, 2014, the Board of Directors authorized a stock repurchase program replacing our previous repurchase program permitting us to repurchase a portion of our shares outstanding not to exceed $300 million in the aggregate. During the year ended September 30, 2014, the Company repurchased 909,700 shares of its common stock at a gross cost of approximately $159.9 million at a weighted-average price of $175.68 per share. These repurchases were made under the previous program, which permitted us to repurchase a portion of our outstanding shares not to exceed $200 million in the aggregate. No repurchases were made under the stock repurchase program during the fiscal year ended September 30, 2015.

- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Reference 15: http://www.xbrl.org/2003/role/presentationRef
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Reference 16: http://www.xbrl.org/2003/role/presentationRef
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+ Details

SEGMENTS

12 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

SEGMENTS

The Company’s businesses are organized and managed in three reporting segments: Power & Control, Airframe and Non-aviation. Effective October 1, 2014, the Company made certain organizational realignments of the businesses comprising the Power & Control and the Airframe segments. Operating results for the fiscal years ended September 30, 2013 and September 30, 2014 were reclassified to conform to the presentation for the fiscal year ended September 30, 2015.

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/electro-mechanical actuators and controls, ignition systems and engine technology, specialized pumps and valves, power conditioning devices, specialized AC/DC electric motors and generators and cargo loading and handling 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, rods and locking devices, engineered connectors and elastomers, cockpit security components and systems, aircraft audio systems, specialized lavatory components, seat belts and safety restraints, engineered interior surfaces and related components, lighting and control technology, military personnel parachutes and cargo delivery systems. 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/electro-mechanical actuators and controls for space applications, and refueling systems for heavy equipment used in mining, construction and other industries. Primary customers of this segment are off-road vehicle suppliers and subsystem suppliers, child restraint system suppliers, satellite and space system suppliers and manufacturers of heavy equipment used in mining, construction and other industries.

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 refinancing costs, acquisition-related costs, transaction-related costs and non-cash compensation charges incurred in connection with the Company’s stock option plans. Acquisition-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 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 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 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 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 insignificant for the periods presented below. Certain corporate-level expenses are allocated to the operating segments.

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



	Fiscal Years Ended September 30,
	2015		2014		2013
Net sales to external customers
Power & Control	$	1,330,135	$	1,161,808	$	946,587
Airframe	1,280,706		1,115,594		877,174
Non-aviation	96,274		95,504		100,639
	$	2,707,115	$	2,372,906	$	1,924,400

The following table reconciles EBITDA As Defined by segment to consolidated income before income taxes (in thousands):



	Fiscal Years Ended September 30,
	2015			2014		2013
EBITDA As Defined
Power & Control	$	653,050		$	585,671	$	493,733
Airframe	585,472			494,076		406,283
Non-aviation	22,406			18,479		23,647
Total segment EBITDA As Defined	1,260,928			1,098,226		923,663
Unallocated corporate expenses	27,274			25,019		23,385
Total Company EBITDA As Defined	1,233,654			1,073,207		900,278
Depreciation and amortization	93,663			96,385		73,515
Interest expense, net	418,785			347,688		270,685
Acquisition-related costs	36,623			20,541		26,433
Stock compensation expense	31,500			26,332		48,884
Refinancing costs	18,393			131,622		30,281
Other items, net	(2,134		)	2,129		1,991
Income before income taxes	$	636,824		$	448,510	$	448,489

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



	Fiscal Years Ended September 30,
	2015		2014		2013
Capital expenditures
Power & Control	$	24,664	$	13,882	$	15,216
Airframe	28,086		17,096		17,054
Non-aviation	1,889		3,097		2,773
Corporate	232		71		492
	$	54,871	$	34,146	$	35,535
Depreciation and amortization
Power & Control	$	39,336	$	40,401	$	29,789
Airframe	50,355		50,311		40,757
Non-aviation	2,846		4,579		2,614
Corporate	1,126		1,094		355
	$	93,663	$	96,385	$	73,515

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



	September 30, 2015		September 30, 2014
Total assets
Power & Control	$	3,550,866	$	2,441,286
Airframe	3,923,137		3,255,538
Non-aviation	129,935		132,988
Corporate	823,112		927,036
	$	8,427,050	$	6,756,848

The Company’s sales principally originate from the United States, and the Company’s long-lived assets are principally located in the United States.

- 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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+ Details

STOCK-BASED COMPENSATION

12 Months Ended

Sep. 30, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

The Company’s stock 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 stock compensation plans provide for the granting of stock options, restricted stock and other stock-based incentives.

Non-cash stock compensation expense recognized by the Company during the years ended September 30, 2015, 2014 and 2013 was $31.5 million, $26.3 million and $48.9 million, respectively.

During the year ended September 30, 2014, the Company recorded additional stock compensation expense of $6.4 million representing costs that would have been recognized over the remaining requisite service period of the award for options granted in fiscal 2012 that became fully vested under the market sweep provision, as discussed further below. During June 2013, a total of 2,409,420 unvested options granted prior to October 1, 2011 with a weighted-average exercise price per option of $58.35 became fully vested under the market sweep provision. Due to the accelerated vesting, the Company recorded additional stock compensation expense of $24.5 million representing costs that would have been recognized over the remaining requisite service period of the award.

The weighted-average grant date fair value of options granted during the fiscal years ended September 30, 2015, 2014 and 2013 was $65.57, $57.53 and $45.53, respectively.

Compensation expense is recognized based upon probability assessments of awards that are expected to vest in future periods. Such probability assessments are subject to revision and, therefore, unrecognized compensation expense is subject to future changes in estimate. As of September 30, 2015, there was approximately $57.6 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 2.1 years.

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



	Fiscal Years Ended September 30,
	2015	2014	2013
Risk-free interest rate	1.33% to 1.64%	1.71% to 2.03%	0.84% to 1.00%
Expected life of options	5 years	6 years	6 years
Expected dividend yield of stock	—	—	—
Expected volatility of stock	35%	35%	35%

The risk-free interest rate is based upon the Treasury bond rates as of the grant date. The average expected life of stock-based awards is based on the Company’s actual historical exercise experience. Expected volatility of stock was calculated using a rate based upon the historical volatility of both TransDigm’s common stock and the stock of publicly traded companies in the Company’s peer group in the aerospace industry. Notwithstanding the special cash dividends paid in October 2012, July 2013 and June 2014, the Company historically has not paid regular cash dividends and does not anticipate paying regular cash dividends in future periods; thus, no dividend rate assumption is used.

The total fair value of options vested during fiscal years ended September 30, 2015, 2014 and 2013 was $14.9 million, $23.6 million and $63.9 million, respectively.

2014 Stock Option Plan

In July 2014, the Board of Directors of TD Group adopted a new stock option plan, which was subsequently approved by stockholders on October 2, 2014. The 2014 stock option plan permits TD Group to award our key employees, directors or consultants stock options. 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. No options have been granted thereunder.

2006 Stock Incentive Plan

In conjunction with the consummation of the initial public offering, a 2006 stock incentive plan was adopted by TD Group. In July 2008 and March 2011, the plan was amended to increase the number of shares available for issuance thereunder. TD Group has reserved 8,119,668 shares of its common stock for issuance to key employees, directors or consultants under the plan. Awards under the plan may be in the form of options, restricted stock or other stock-based awards. Options granted under the plan will expire no later than the tenth anniversary of the applicable date of grant of the options, and will 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 vests over three years.

In connection with the $12.85 per share special cash dividend paid in November 2012, in order to take into account the earlier return of capital, the TD Group compensation committee adjusted the market-based vesting features in outstanding options pursuant to the authority granted to the committee under the TD Group stock incentive plan. Under this “market sweep” provision, unvested options granted prior to October 1, 2011 would accelerate and become fully vested if the closing price of the Company’s common stock exceeded $147.15 per share (originally $160 per share) on any 60 trading days during any consecutive 12-month period commencing March 1, 2013.

In addition, in connection with the $12.85 per share special cash dividend paid in November 2012 and the $22.00 per share special cash dividend paid in July 2013, in order to take into account the earlier return of capital, the TD Group compensation committee adjusted the market-based vesting features in outstanding options pursuant to the authority granted to the committee under the TD Group stock incentive plan. Under this “market sweep” provision, unvested options granted in fiscal 2012 would accelerate and become fully vested if the closing price of the Company’s common stock exceeded $135.15 per share (originally $170 per share) on any 60 trading days during any consecutive 12-month period commencing two years from the date of grant. Options granted since fiscal 2012 do not contain such accelerated vesting provision.

In addition to shares issued pursuant to options exercised, during the fiscal year ended September 30, 2015, 1,973 shares of common stock were issued with a weighted-average grant date fair value of $211.76 as payment to directors in lieu of cash. The Company also granted 17,700 restricted stock units with a weighted-average grant date fair value of $189.97 during the fiscal year ended September 30, 2015. The 17,700 restricted stock units granted during fiscal year 2015 were outstanding at September 30, 2015.

Performance Vested Stock Options—All of the options granted through September 30, 2015 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 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, 2015:



	Number of Options		Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2014	5,328,104		$	82.18
Granted	1,183,330		197.26
Exercised	(1,042,166	)	55.71
Forfeited	(203,725	)	145.77
Expired	—		—
Outstanding at September 30, 2015	5,265,543		$	110.82	6.3 years	$	534,926,513
Expected to vest	1,616,548		$	138.95	7.8 years	$	118,757,272
Exercisable at September 30, 2015	3,123,768		$	72.38	4.9 years	$	437,421,233

At September 30, 2015, there were 687,944 remaining shares available for award under TD Group’s 2006 stock incentive plan.

2003 Stock Option Plan

Certain executives and key employees of the Company were granted stock options under TD Group’s 2003 stock option plan. Upon the closing of the acquisition of the Company by Warburg Pincus in 2003, certain employees rolled over certain then-existing options to purchase shares of common stock of TransDigm Holdings. These employees were granted rollover options to purchase an aggregate of 3,870,152 shares of common stock of TD Group (after giving effect to the 149.60 for 1.00 stock split effected on March 14, 2006). All rollover options granted were fully vested on the date of grant. In addition to shares of common stock reserved for issuance upon the exercise of rollover options, an aggregate of 5,469,301 shares of TD Group’s common stock were reserved for issuance upon the exercise of new management options. In general, approximately 20% of all new management options vested based on employment service or a change in control. These time vested options had a graded vesting schedule of up to four years. Approximately 80% of all new management options vested (i) based upon the satisfaction of specified performance criteria, which is annual and cumulative EBITDA As Defined targets through 2008, or (ii) upon the occurrence of a change in control if the Investor Group (defined as Warburg Pincus and the other initial investors in TD Group) received a minimum specified rate of return. Unless terminated earlier, the options expire ten years from the date of grant.

TD Group reserved a total of 9,339,453 shares of its common stock for issuance to the Company’s employees under the plan, which had all been issued as of September 30, 2013.

Time Vested Stock Options—The following table summarizes activity, pricing and other information for the Company’s time vested stock-based award activity during the fiscal year ended September 30, 2015:



	Number of Options		Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2014	40,243		$	28.24
Granted	—		—
Exercised	(34,757	)	26.40
Forfeited	—		—
Outstanding at September 30, 2015	5,486		$	39.88	1.8 years	$	946,499
Exercisable at September 30, 2015	5,486		$	39.88	1.8 years	$	946,499

Performance Vested Stock Options—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, 2015:



	Number of Options		Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2014	284,268		$	48.48
Granted	—		—
Exercised	(171,252	)	15.72
Outstanding at September 30, 2015	113,016		$	98.11	5.3 years	$	12,917,729
Exercisable at September 30, 2015	35,187		$	27.38	1.1 years	$	6,510,651

The total intrinsic value of time, performance and rollover options exercised during the fiscal years ended September 30, 2015, 2014 and 2013 was $206.9 million, $88.7 million and $120.8 million, respectively.

Dividend Equivalent Plans

Pursuant to the Third Amended and Restated TransDigm Group Incorporated 2003 Stock Option Plan Dividend Equivalent Plan and the Second Amended and Restated TransDigm Group Incorporated 2006 Stock Incentive Plan Dividend Equivalent Plan, all of the options granted under the 2003 stock option plan and the 2006 stock incentive plan are entitled to certain dividend equivalent payments in the event of the declaration of a dividend by the Company.

Dividend equivalent payments on vested options including those options that became fully vested under market sweep provisions thereof were $3.4 million, $126.6 million and $171.2 million during the years ended September 30, 2015, 2014 and 2013, respectively.

LEASES	12 Months Ended
LEASES	Sep. 30, 2015
Leases [Abstract]
LEASES	LEASES TransDigm leases certain manufacturing facilities, offices, equipment and vehicles. Such leases, some of which are noncancelable and, in many cases, include renewals, expire at various dates. Rental expense during the years ended September 30, 2015, 2014 and 2013 was $14.0 million, $12.1 million and $9.2 million, respectively. Future minimum rental commitments at September 30, 2015 under operating leases having initial or remaining non-cancelable lease terms exceeding one year are $13.3 million in fiscal 2016, $11.6 million in fiscal 2017, $9.5 million in fiscal 2018, $7.0 million in fiscal 2019, $6.1 million in fiscal 2020, and $20.3 million thereafter.

FAIR VALUE MEASUREMENTS

12 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

FAIR VALUE MEASUREMENTS

The following tables present 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 as of September 30 (in thousands):



		September 30, 2015				September 30, 2014
	Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	714,033	$	714,033	$	819,548	$	819,548
Interest rate cap agreements⁽¹⁾	2	8,180		8,180		—		—
Liabilities:
Interest rate swap agreements⁽²⁾	2	24,770		24,770		20,070		20,070
Interest rate swap agreements⁽³⁾	2	49,730		49,730		4,650		4,650
Short-term borrowings—trade receivable securitization facility	1	200,000		200,000		200,000		200,000
Long-term debt:
Term loans	2	4,377,342		4,344,000		3,873,131		3,821,000
2020 Notes	1	550,000		520,000		550,000		529,000
2021 Notes	1	500,000		524,000		500,000		531,000
2022 Notes	1	1,150,000		1,081,000		1,150,000		1,121,000
2024 Notes	1	1,200,000		1,119,000		1,200,000		1,182,000
2025 Notes	1	450,000		417,000		—		—


(1)	Included in Other non-current assets on the Condensed Consolidated Balance Sheet.


(2)	Included in Accrued liabilities on the Condensed Consolidated Balance Sheet.


(3)	Included in Other non-current liabilities on the Condensed Consolidated Balance Sheet.

The Company values its financial instruments using an industry standard market approach, in which prices and other relevant information is generated by market transactions involving identical or comparable assets or liabilities. No financial instruments were recognized using unobservable inputs.

Interest rate swaps were measured at fair value using quoted market prices for the swap interest rate indexes over the term of the swap discounted to present value versus the fixed rate of the contract. The interest rate caps were measured at fair value using implied volatility rates of each individual caplet and the yield curve for the related periods. The estimated fair value of the Company’s term loans was based on information provided by the agent under the Company’s senior secured credit facility. The estimated fair values of the Company’s 2020 Notes, 2021 Notes, 2022 Notes, 2024 Notes and 2025 Notes were based upon quoted market prices.

The fair value of "Cash and cash equivalents," "Trade accounts receivable-net," and "Accounts payable" approximated book value due to the short-term nature of these instruments at September 30, 2015 and 2014.

DERIVATIVES AND HEDGING ACTIVITIES	12 Months Ended
DERIVATIVES AND HEDGING ACTIVITIES	Sep. 30, 2015
Derivative Instruments and Hedging Activities Disclosure [Abstract]
DERIVATIVES AND HEDGING ACTIVITIES	DERIVATIVES AND HEDGING ACTIVITIES The Company is exposed to, among other things, the impact of changes in 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. The Company has agreements with each of its swap and cap counterparties that contain a provision whereby if the Company defaults on the credit facility the Company could also be declared in default on its swaps and caps, resulting in an acceleration of payment under the swaps and caps. Interest rate swap and cap agreements are used to manage interest rate risk associated with floating-rate borrowings under our credit facilities. The interest rate swap and cap 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 through the expiration date of the interest rate swap and cap agreements, thereby reducing the impact of interest rate changes on future interest expense. 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. These derivative instruments that qualify as effective cash flow hedges under GAAP. For these cash flow hedges, the effective portion of the gain or loss from the financial instruments was initially reported as a component of accumulated other comprehensive income (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. At September 30, 2015, five forward-starting interest rate swap agreements beginning March 31, 2016 were in place to hedge the variable interest rates on the 2014 Term Loans for a fixed rate based on an aggregate notional amount of $750 million through June 30, 2020. These forward-starting interest rate swap agreements will effectively convert the variable interest rate on the aggregate notional amount of the 2014 Term Loans to a fixed rate of 5.8% (2.8% plus the 3% margin percentage) over the term of the interest rate swap agreements. At September 30, 2015, three interest rate swap agreements beginning September 30, 2014 were in place to hedge the variable interest rates on the 2014 Term Loans for a fixed rate based on an aggregate notional amount of $1,000 million through June 30, 2019. These interest rate swap agreements converted the variable interest rate on the aggregate notional amount of the 2014 Term Loans to a fixed rate of 5.4% (2.4% plus the 3% margin percentage) over the term of the interest rate swap agreements. During the fiscal year ended September 30, 2015, three interest rate swap agreements were in place to swap variable rates on the 2014 Term Loans for a fixed rate based on an aggregate notional amount of $353 million through June 30, 2015. These interest rate swap agreements converted the variable interest rate on the aggregate notional amount of the 2014 Term Loans to a fixed rate of 5.2% (2.2% plus the 3% margin percentage) over the term of the interest rate swap agreements. At September 30, 2015, six interest rate cap agreements beginning September 30, 2015 were in place to offset the variable interest rates on the 2015 Term Loans based on an aggregate notional amount of $750 million. These interest rate cap agreements offset the variability in expected future cash flows on the Company's variable rate debt attributable to fluctuations above the three month LIBOR of 2.5% through June 30, 2020. In conjunction with the refinancing of the 2011 Term Loans, the Company no longer designated the interest rate swap agreements relating to the $353 million aggregate notional amount as cash flow hedges for accounting purposes. Accordingly, amounts previously recorded as a component of accumulated other comprehensive loss in stockholder’s deficit amortized into earnings totaled $3.2 million, $4.2 million and $2.5 million for the fiscal years ended September 30, 2015, 2014 and 2013, respectively. The net after-tax loss included in accumulated other comprehensive loss to be reclassified into interest expense over the next twelve months totaled $24.8 million at September 30, 2015.

- Definition

The entire disclosure for derivative instruments and hedging activities including, but not limited to, risk management strategies, non-hedging derivative instruments, assets, liabilities, revenue and expenses, and methodologies and assumptions used in determining the amounts.

+ References

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-Name Accounting Standards Codification
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+ Details

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

12 Months Ended

Sep. 30, 2015

Equity [Abstract]

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)

The following table presents the components of “Accumulated other comprehensive income (loss)” ("AOCI") in the Consolidated Balance Sheet, net of taxes, for the years ended September 30, 2015, 2014 and 2013 (in thousands):



	Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges			Defined benefit pension plan activity			Currency translation adjustment			Total
Balance at September 30, 2013	$	(9,722	)	$	(1,391	)	$	4,597		$	(6,516	)
Other comprehensive loss before reclassification	(10,366		)	(4,836		)	(7,653		)	(22,855		)
Amounts reclassified from AOCI related to interest rate swap agreements ⁽¹⁾	4,200			—			—			4,200
Net current-period other comprehensive loss	$	(6,166	)	$	(4,836	)	$	(7,653	)	$	(18,655	)
Balance at September 30, 2014	$	(15,888	)	$	(6,227	)	$	(3,056	)	$	(25,171	)
Other comprehensive loss before reclassification	(38,754		)	(5,786		)	(29,448		)	(73,988		)
Amounts reclassified from AOCI related to interest rate swap agreements ⁽¹⁾	3,150			—			—			3,150
Net current-period other comprehensive loss	$	(35,604	)	$	(5,786	)	$	(29,448	)	$	(70,838	)
Balance at September 30, 2015	$	(51,492	)	$	(12,013	)	$	(32,504	)	$	(96,009	)

(1) This component of AOCI is included in interest expense (see Note 20, "Derivatives and Hedging Activities," for additional details).

- Definition

The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income.

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-Name Accounting Standards Codification
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+ Details

QUARTERLY FINANCIAL DATA (UNAUDITED)

12 Months Ended

Sep. 30, 2015

Quarterly Financial Information Disclosure [Abstract]

QUARTERLY FINANCIAL DATA (UNAUDITED)



	First Quarter Ended December 27, 2014		Second Quarter Ended March 28, 2015		Third Quarter Ended June 27, 2015		Fourth Quarter Ended September 30, 2015
	(in thousands, except per share amounts)
Year Ended September 30, 2015
Net sales⁽²⁾	$	586,898	$	619,030	$	691,395	$	809,792
Gross profit⁽²⁾	321,173		341,617		359,455		427,600
Net income⁽²⁾	95,533		110,894		99,112		141,673
Net earnings per share—basic and diluted⁽¹⁾	$	1.63	$	1.96	$	1.75	$	2.50



	First Quarter Ended December 28, 2013		Second Quarter Ended March 29, 2014		Third Quarter Ended June 28, 2014			Fourth Quarter Ended September 30, 2014
	(in thousands, except per share amounts)
Year Ended September 30, 2014
Net sales⁽²⁾	$	529,322	$	590,761	$	610,582		$	642,241
Gross profit⁽²⁾	284,136		307,582		327,528			348,628
Net income⁽²⁾	86,123		90,355		16,177			114,255
Net earnings (loss) per share—basic and diluted⁽¹⁾	$	1.44	$	1.49	$	(1.66	)	$	1.91


(1)	The sum of the earnings per share for the four quarters in a year does not necessarily equal the total year earnings per share.


(2)	The Company’s operating results include the results of operations of acquisitions from the effective date of each acquisition. See Note 2 to the Consolidated Financial Statements.

SUPPLEMENTAL GUARANTOR INFORMATION

12 Months Ended

Sep. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

SUPPLEMENTAL GUARANTOR INFORMATION

TransDigm’s 2020 Notes, 2021 Notes, 2022 Notes, 2024 Notes and 2025 Notes are jointly and severally guaranteed, on a senior subordinated basis, by TD Group and TransDigm Inc.’s 100% Domestic Restricted Subsidiaries, as defined in the Indentures. The following supplemental condensed consolidating financial information presents, in separate columns, the balance sheets of the Company as of September 30, 2015 and September 30, 2014 and its statements of income and cash flows for the fiscal years ended September 30, 2015, 2014 and 2013 for (i) TransDigm Group on a parent only basis with its investment in subsidiaries recorded under the equity method, (ii) TransDigm Inc. including its directly owned operations and non-operating entities, (iii) the Subsidiary Guarantors on a combined basis, (iv) Non-Guarantor Subsidiaries and (v) the Company on a consolidated basis.

Separate financial statements of TransDigm Inc. are not presented because TransDigm Inc.'s 2020 Notes, 2021 Notes, 2022 Notes, 2024 Notes and 2025 Notes are fully and unconditionally guaranteed on a senior subordinated basis by TD Group and all existing 100% owned domestic subsidiaries of TransDigm Inc. and because TD Group has no significant operations or assets separate from its investment in TransDigm Inc.

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF SEPTEMBER 30, 2015

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors		Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	1,500		$	659,365		$	7,911	$	45,257		$	—		$	714,033
Trade accounts receivable—Net	—			(265		)	48,369		413,380			(17,412		)	444,072
Inventories—Net	—			34,457			461,103		96,541			(700		)	591,401
Deferred income taxes	—			44,677			—		698			—			45,375
Prepaid expenses and other	—			2,804			15,096		19,181			—			37,081
Total current assets	1,500			741,038			532,479		575,057			(18,112		)	1,831,962
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	(1,039,806		)	6,963,034			4,501,501		(33,208		)	(10,391,521		)	—
PROPERTY, PLANT AND EQUIPMENT—Net	—			16,565			201,499		42,620			—			260,684
GOODWILL	—			65,886			3,984,199		636,135			—			4,686,220
OTHER INTANGIBLE ASSETS—Net	—			38,621			1,236,376		266,315			(1,461		)	1,539,851
OTHER	—			91,244			14,528		2,561			—			108,333
TOTAL ASSETS	$	(1,038,306	)	$	7,916,388		$	10,470,582	$	1,489,480		$	(10,411,094	)	$	8,427,050
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
CURRENT LIABILITIES:
Current portion of long-term debt	$	—		$	43,840		$	—	$	—		$	—		$	43,840
Short-term borrowings—trade receivable securitization facility	—			—			—		200,000			—			200,000
Accounts payable	—			16,561			102,968		37,556			(14,263		)	142,822
Accrued liabilities	—			97,045			117,243		57,265			—			271,553
Total current liabilities	—			157,446			220,211		294,821			(14,263		)	658,215
LONG-TERM DEBT	—			8,183,502			—		—			—			8,183,502
DEFERRED INCOME TAXES	—			379,525			2,410		68,437			—			450,372
OTHER NON-CURRENT LIABILITIES	—			99,743			35,222		38,302			—			173,267
Total liabilities	—			8,820,216			257,843		401,560			(14,263		)	9,465,356
STOCKHOLDERS’ (DEFICIT) EQUITY	(1,038,306		)	(903,828		)	10,212,739		1,087,920			(10,396,831		)	(1,038,306		)
TOTAL LIABILITIES AND STOCKHOLDERS’ (DEFICIT) EQUITY	$	(1,038,306	)	$	7,916,388		$	10,470,582	$	1,489,480		$	(10,411,094	)	$	8,427,050

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF SEPTEMBER 30, 2014

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors		Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	2,088		$	782,648		$	3,793	$	31,019		$	—		$	819,548
Trade accounts receivable—Net	—			(305		)	1,711		351,881			(1,980		)	351,307
Inventories—Net	—			32,287			382,016		45,471			(700		)	459,074
Deferred income taxes	—			37,669			—		—			—			37,669
Prepaid expenses and other	—			2,040			14,789		5,149			—			21,978
Total current assets	2,088			854,339			402,309		433,520			(2,680		)	1,689,576
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	(1,558,187		)	5,327,465			3,758,085		(59,788		)	(7,467,575		)	—
PROPERTY, PLANT AND EQUIPMENT—Net	—			15,884			167,257		28,967			—			212,108
GOODWILL	—			64,461			3,289,295		171,321			—			3,525,077
OTHER INTANGIBLE ASSETS—Net	—			40,066			1,092,011		86,536			(1,460		)	1,217,153
OTHER	—			100,000			11,754		1,180			—			112,934
TOTAL ASSETS	$	(1,556,099	)	$	6,402,215		$	8,720,711	$	661,736		$	(7,471,715	)	$	6,756,848
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
CURRENT LIABILITIES:
Current portion of long-term debt	$	—		$	39,295		$	—	$	—		$	—		$	39,295
Short-term borrowings—trade receivable securitization facility	—			—			—		200,000			—			200,000
Accounts payable	—			17,629			85,328		14,768			(1,984		)	115,741
Accrued liabilities	—			106,631			98,308		25,932			—			230,871
Total current liabilities	—			163,555			183,636		240,700			(1,984		)	585,907
LONG-TERM DEBT	—			7,233,836			—		—			—			7,233,836
DEFERRED INCOME TAXES	—			402,538			—		(291		)	—			402,247
OTHER NON-CURRENT LIABILITIES	—			42,470			42,445		6,042			—			90,957
Total liabilities	—			7,842,399			226,081		246,451			(1,984		)	8,312,947
STOCKHOLDERS’ (DEFICIT) EQUITY	(1,556,099		)	(1,440,184		)	8,494,630		415,285			(7,469,731		)	(1,556,099		)
TOTAL LIABILITIES AND STOCKHOLDERS’ (DEFICIT) EQUITY	$	(1,556,099	)	$	6,402,215		$	8,720,711	$	661,736		$	(7,471,715	)	$	6,756,848

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME

FOR THE YEAR ENDED SEPTEMBER 30, 2015

(Amounts in thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET SALES	$	—		$	131,378		$	2,262,842		$	324,675		$	(11,780	)	$	2,707,115
COST OF SALES	—			79,174			973,908			215,968			(11,780		)	1,257,270
GROSS PROFIT	—			52,204			1,288,934			108,707			—			1,449,845
SELLING AND ADMINISTRATIVE EXPENSES	—			72,792			197,914			50,918			—			321,624
AMORTIZATION OF INTANGIBLE ASSETS	—			1,392			45,337			7,490			—			54,219
(LOSS) INCOME FROM OPERATIONS	—			(21,980		)	1,045,683			50,299			—			1,074,002
INTEREST EXPENSE (INCOME)—Net	—			430,224			(487		)	(10,952		)	—			418,785
REFINANCING COSTS	—			18,393			—			—			—			18,393
EQUITY IN INCOME OF SUBSIDIARIES	(447,212		)	(773,510		)	—			—			1,220,722			—
INCOME BEFORE INCOME TAXES	447,212			302,913			1,046,170			61,251			(1,220,722		)	636,824
INCOME TAX (BENEFIT) PROVISION	—			(144,299		)	315,017			18,894			—			189,612
NET INCOME	$	447,212		$	447,212		$	731,153		$	42,357		$	(1,220,722	)	$	447,212
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX	(70,838		)	(55,338		)	770			(29,147		)	83,715			(70,838		)
TOTAL COMPREHENSIVE INCOME	$	376,374		$	391,874		$	731,923		$	13,210		$	(1,137,007	)	$	376,374

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME

FOR THE YEAR ENDED SEPTEMBER 30, 2014

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET SALES	$	—		$	125,389		$	2,051,541		$	206,952		$	(10,976	)	$	2,372,906
COST OF SALES	—			74,312			895,041			146,878			(11,199		)	1,105,032
GROSS PROFIT	—			51,077			1,156,500			60,074			223			1,267,874
SELLING AND ADMINISTRATIVE EXPENSES	—			65,272			176,516			34,658			—			276,446
AMORTIZATION OF INTANGIBLE ASSETS	—			1,388			55,730			6,490			—			63,608
(LOSS) INCOME FROM OPERATIONS	—			(15,583		)	924,254			18,926			223			927,820
INTEREST EXPENSE (INCOME)—Net	—			349,289			(36		)	(1,565		)	—			347,688
REFINANCING COSTS	—			131,622			—			—			—			131,622
EQUITY IN INCOME OF SUBSIDIARIES	(306,910		)	(639,539		)	—			—			946,449			—
INCOME BEFORE INCOME TAXES	306,910			143,045			924,290			20,491			(946,226		)	448,510
INCOME TAX (BENEFIT) PROVISION	—			(163,865		)	293,961			11,504			—			141,600
NET INCOME	$	306,910		$	306,910		$	630,329		$	8,987		$	(946,226	)	$	306,910
OTHER COMPREHENSIVE LOSS, NET OF TAX	(18,655		)	(3,951		)	(1,520		)	(13,184		)	18,655			(18,655		)
TOTAL COMPREHENSIVE INCOME (LOSS)	$	288,255		$	302,959		$	628,809		$	(4,197	)	$	(927,571	)	$	288,255

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME

FOR THE YEAR ENDED SEPTEMBER 30, 2013

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors		Non-Guarantor Subsidiaries		Eliminations			Total Consolidated
NET SALES	$	—		$	110,608		$	1,699,742	$	120,706	$	(6,656	)	$	1,924,400
COST OF SALES	—			66,524			732,812		81,583		(6,081		)	874,838
GROSS PROFIT	—			44,084			966,930		39,123		(575		)	1,049,562
SELLING AND ADMINISTRATIVE EXPENSES	—			88,286			147,620		17,180		1,382			254,468
AMORTIZATION OF INTANGIBLE ASSETS	—			624			43,265		1,750		—			45,639
(LOSS) INCOME FROM OPERATIONS	—			(44,826		)	776,045		20,193		(1,957		)	749,455
INTEREST EXPENSE—Net	—			267,385			2,028		1,272		—			270,685
REFINANCING COSTS	—			30,281			—		—		—			30,281
EQUITY IN INCOME OF SUBSIDIARIES	(302,789		)	(505,199		)	—		—		807,988			—
INCOME BEFORE INCOME TAXES	302,789			162,707			774,017		18,921		(809,945		)	448,489
INCOME TAX (BENEFIT) PROVISION	—			(140,082		)	272,829		12,953		—			145,700
NET INCOME	$	302,789		$	302,789		$	501,188	$	5,968	$	(809,945	)	$	302,789
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	1,535			(4,515		)	950		5,100		(1,535		)	1,535
TOTAL COMPREHENSIVE INCOME	$	304,324		$	298,274		$	502,138	$	11,068	$	(811,480	)	$	304,324

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE YEAR ENDED SEPTEMBER 30, 2015

(Amounts in thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	—		$	(298,797	)	$	734,130		$	82,451		$	3,154		$	520,938
INVESTING ACTIVITIES:
Capital expenditures	—			(2,871		)	(44,564		)	(7,436		)	—			(54,871		)
Acquisition of business, net of cash acquired	—			(1,624,278		)	—			—			—			(1,624,278		)
Net cash used in investing activities	—			(1,627,149		)	(44,564		)	(7,436		)	—			(1,679,149		)
FINANCING ACTIVITIES:
Intercompany activities	(120,862		)	867,990			(685,448		)	(58,526		)	(3,154		)	—
Excess tax benefits related to share-based payment arrangements	61,965			—			—			—			—			61,965
Proceeds from exercise of stock options	61,674			—			—			—			—			61,674
Dividends paid	(3,365		)	—			—			—			—			(3,365		)
Proceeds from 2015 Term Loans, net	—			1,505,673			—			—			—			1,505,673
Proceeds from term loans, net	—			10,281			—			—			—			10,281
Proceeds from Revolving Commitment	—			75,250			—			—			—			75,250
Repayment on 2015 Term Loans	—			(7,330		)	—			—			—			(7,330		)
Repayment on term loans	—			(1,017,988		)	—			—			—			(1,017,988		)
Repayment on Revolving Commitment	—			(75,250		)	—			—			—			(75,250		)
Proceeds from 2025 Notes, net	—			445,303			—			—			—			445,303
Other	—			(1,266		)	—			—			—			(1,266		)
Net cash (used in) provided by financing activities	(588		)	1,802,663			(685,448		)	(58,526		)	(3,154		)	1,054,947
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			—			(2,251		)	—			(2,251		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(588		)	(123,283		)	4,118			14,238			—			(105,515		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,088			782,648			3,793			31,019			—			819,548
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1,500		$	659,365		$	7,911		$	45,257		$	—		$	714,033

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE YEAR ENDED SEPTEMBER 30, 2014

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	—		$	(123,074	)	$	952,855		$	(303,763	)	$	15,204		$	541,222
INVESTING ACTIVITIES:
Capital expenditures	—			(2,666		)	(28,927		)	(2,553		)	—			(34,146		)
Acquisition of business, net of cash acquired	—			(311,872		)	—			—			—			(311,872		)
Cash proceeds from sale of real estate	—			—			16,380			—			—			16,380
Net cash used in investing activities	—			(314,538		)	(12,547		)	(2,553		)	—			(329,638		)
FINANCING ACTIVITIES:
Intercompany activities	1,533,571			(694,208		)	(944,415		)	120,256			(15,204		)	—
Excess tax benefits related to share-based payment arrangements	51,709			—			—			—			—			51,709
Proceeds from exercise of stock options	26,738			—			—			—			—			26,738
Dividends paid	(1,451,391		)	—			—			—			—			(1,451,391		)
Treasury stock purchased	(159,852		)	—			—			—			—			(159,852		)
Proceeds from term loans, net	—			805,360			—			—			—			805,360
Repayment on term loans	—			(33,107		)	—			—			—			(33,107		)
Proceeds from senior subordinated notes, net	—			2,326,393			—			—			—			2,326,393
Repurchase of 2018 Notes	—			(1,721,014		)	—			—			—			(1,721,014		)
Proceeds from trade receivable securitization facility, net	—			—			—			199,164			—			199,164
Other	—			(27		)	—			—			—			(27		)
Net cash provided by (used in) financing activities	775			683,397			(944,415		)	319,420			(15,204		)	43,973
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			—			(749		)	—			(749		)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	775			245,785			(4,107		)	12,355			—			254,808
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,313			536,863			7,900			18,664			—			564,740
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	2,088		$	782,648		$	3,793		$	31,019		$	—		$	819,548

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE YEAR ENDED SEPTEMBER 30, 2013

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	—		$	(95,862	)	$	565,957		$	8,703		$	(8,593	)	$	470,205
INVESTING ACTIVITIES:
Capital expenditures	—			(2,047		)	(29,727		)	(3,761		)	—			(35,535		)
Acquisition of businesses, net of cash acquired				(483,257		)	—			—			—			(483,257		)
Cash proceeds from sale of investment	—			16,350			—			—			—			16,350
Net cash used in investing activities	—			(468,954		)	(29,727		)	(3,761		)	—			(502,442		)
FINANCING ACTIVITIES:
Intercompany activities	1,884,828			(1,365,022		)	(532,824		)	4,425			8,593			—
Excess tax benefits related to share-based payment arrangements	66,201			—			—			—			—			66,201
Proceeds from exercise of stock options	21,534			—			—			—			—			21,534
Dividends paid	(1,991,350		)	—			—			—			—			(1,991,350		)
Proceeds from term loans, net	—			3,211,374			—			—			—			3,211,374
Repayment on term loans	—			(2,187,885		)	—			—			—			(2,187,885		)
Proceeds from senior subordinated notes, net	—			1,036,321			—			—			—			1,036,321
Net cash (used in) provided by financing activities	(18,787		)	694,788			(532,824		)	4,425			8,593			156,195
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			—			258			—			258
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(18,787		)	129,972			3,406			9,625			—			124,216
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	20,100			406,891			4,494			9,039			—			440,524
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1,313		$	536,863		$	7,900		$	18,664		$	—		$	564,740

*****

VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Sep. 30, 2015

Valuation and Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

TRANSDIGM GROUP INCORPORATED

VALUATION AND QUALIFYING ACCOUNTS

FOR THE YEARS ENDED SEPTEMBER 30, 2015, 2014, AND 2013

(Amounts in Thousands)



Column A	Column B		Column C						Column D			Column E
	Balance at Beginning of Period		Additions						Deductions from Reserve⁽¹⁾			Balance at End of Period
Description	Balance at Beginning of Period		Charged to Costs and Expenses			Acquisitions			Deductions from Reserve⁽¹⁾			Balance at End of Period
Year Ended September 30, 2015
Allowance for doubtful accounts	$	4,091	$	(376	)	$	271		$	(185	)	$	3,801
Reserve for excess and obsolete inventory	55,586		15,554			—			(6,982		)	64,158
Valuation allowance for deferred tax assets	24,267		(6,622		)	—			—			17,645
Year Ended September 30, 2014
Allowance for doubtful accounts	$	5,485	$	682		$	81		$	(2,157	)	$	4,091
Reserve for excess and obsolete inventory	45,369		16,027			—			(5,810		)	55,586
Valuation allowance for deferred tax assets	26,125		(4,494		)	2,636			—			24,267
Year Ended September 30, 2013
Allowance for doubtful accounts	4,960		1,566			1,137			(2,178		)	5,485
Reserve for excess and obsolete inventory	36,081		14,159			148			(5,019		)	45,369
Valuation allowance for deferred tax assets	16,150		10,217			(242		)	—			26,125


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

SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	12 Months Ended
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)	Sep. 30, 2015
Accounting Policies [Abstract]
Basis Of Presentation And Consolidation	Basis of Presentation and Consolidation—The accompanying consolidated financial statements were prepared in conformity with generally accepted accounting principles in the United States (“GAAP”) and include the accounts of TD Group and subsidiaries. All significant intercompany balances and transactions have been eliminated.
Revenue Recognition and Related Allowances	Revenue Recognition and Related Allowances—Revenue is recognized from the sale of products when title and risk of loss passes to the customer, which is generally at the time of shipment. Substantially all product sales are made pursuant to firm, fixed-price purchase orders received from customers. Provisions for estimated returns, uncollectible accounts and the cost of repairs under contract warranty provisions are provided for in the same period as the related revenues are recorded and are principally based on historical results modified, as appropriate, by the most current information available. Due to uncertainties in the estimation process, it is possible that actual results may vary from the estimates.
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 Costs	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 years ended September 30, 2015, 2014 and 2013 was approximately $48.3 million, $42.3 million, and $32.1 million, respectively.
Cash Equivalents	Cash Equivalents—The Company considers all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents.
Allowance For Uncollectible Accounts	Allowance for Uncollectible Accounts—The Company reserves for amounts determined to be uncollectible based on specific identification of losses and estimated losses based on historical experience. The allowance also incorporates a provision for the estimated impact of disputes with customers. The determination of the amount of the allowance for doubtful accounts is subject to significant levels of judgment and estimation by management. If circumstances change or economic conditions deteriorate or improve, the allowance for doubtful accounts could increase or decrease.
Inventories	Inventories—Inventories are stated at the lower of cost or market. 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. In accordance with industry practice, all inventories are classified as current assets even though a portion of the inventories may not be sold within one year.
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 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. 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. 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.
Debt Issue Costs, Premiums and Discounts	Debt Issue 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/securities.
Intangible Assets	Intangible Assets—Intangible assets consist of identifiable intangibles acquired or recognized in accounting for the acquisitions (trademarks, trade names, technology, order backlog and other intangible assets) and goodwill. 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. 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 current value. A two-step impairment test is used to identify potential goodwill impairment. The first step of the goodwill impairment test, used to identify potential impairment, compares the fair value of a reporting unit (as defined) with its carrying amount, including goodwill. If the fair value of the reporting unit exceeds its carrying amount, goodwill is not considered impaired, and the second step of the goodwill impairment test is unnecessary. The second step measures the amount of impairment, if any, by comparing the carrying value of the goodwill associated with a reporting unit to the implied fair value of the goodwill derived from the estimated overall fair value of the reporting unit and the individual fair values of the other assets and liabilities of the reporting unit. GAAP requires that the annual, and any interim, impairment assessment be performed at the reporting unit level. The reporting unit level is one level below an operating segment. 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 assesses the recoverability of its amortizable intangible assets only when indicators of impairment are present by determining whether the amortization over their remaining lives can be recovered through projected, undiscounted cash flows from future operations. Amortization of amortizable intangible assets is computed using the straight-line method over the following estimated useful lives: technology from 20 to 22 years, order backlog over one year, and other intangible assets over 20 years.
Stock-Based Compensation	Stock-Based Compensation—The Company records stock-based compensation expense using the fair value method of accounting. Compensation expense is recorded over the vesting periods of the stock options, restricted stock and other stock-based incentives.
Income Taxes	Income Taxes—The Company accounts for income taxes using an asset and liability approach. Deferred taxes are recorded for the difference between the book and tax basis of various assets and liabilities. A valuation allowance is provided when it is more likely than not that some or all of a deferred tax asset will not be realized.
Contingencies	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.
Estimates	Estimates—The preparation of financial statements in conformity with 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.
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 and cap 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 Transactions and Translations	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 are accumulated as a separate component of other comprehensive income (loss) for the period. Foreign currency gains or losses recognized currently in income from changes in exchange rates were not material to our results of operations.
Earnings per Share	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 dividends (“participating securities”). Our vested and unvested stock options are considered “participating securities” because they include non-forfeitable rights to dividends. In applying the two-class method, earnings are allocated to both common stock 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.
Recent Accounting Pronouncements	RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09 which creates a new topic in the Accounting Standards Codification (“ASC”) Topic 606, “Revenue From Contracts With Customers.” In addition to superseding and replacing nearly all existing U.S. GAAP revenue recognition guidance, including industry-specific guidance, ASC 606 establishes a new control-based revenue recognition model; changes the basis for deciding when revenue is recognized over time or at a point in time; provides new and more detailed guidance on specific topics; and expands and improves disclosures about revenue. The guidance is effective for the Company for annual reporting periods, including interim periods therein, beginning October 1, 2018. The Company is currently evaluating the impact that the update will have on its financial position, results of operations, cash flows and financial statement disclosures. In April 2015, the FASB issued ASU 2015-03, “Simplifying the Presentation of Debt Issuance Costs,” which expands upon the guidance on the presentation of debt issuance costs. The guidance requires that debt issuance costs related to a recognized debt liability be presented in the balance sheet as a direct deduction from the carrying amount of the debt liability, consistent with debt discounts. The guidance does not change the current requirements surrounding the recognition and measurement of debt issuance costs, and the amortization of debt issuance costs will continue to be reported as interest expense. The guidance is effective for the Company beginning October 1, 2016. Early adoption is allowed for all entities and the new guidance shall be applied to all prior periods retrospectively. We do not expect the adoption of this guidance to have a significant impact on our consolidated financial position and results of operations, although it will change the financial statement classification of debt issue costs. As of September 30, 2015 and 2014, we had $77.7 million and $92.4 million in debt issue costs recorded as an asset on the Consolidated Balance Sheets, respectively. Under the new guidance, the debt issue costs would offset the carrying amount of the respective debt on the Consolidated Balance Sheets.

ACQUISITIONS Business Combinations (Tables)

12 Months Ended

Sep. 30, 2015

Business Combinations [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table summarizes the purchase price allocation of the estimated fair values of the assets acquired and liabilities assumed at the transaction date (in thousands).



Assets acquired:
Current assets, excluding cash acquired	$	143,417
Property, plant, and equipment	16,011
Intangible assets	203,860
Goodwill	515,690
Other	1,445
Total assets acquired	$	880,423
Liabilities assumed:
Current liabilities	$	59,008
Other noncurrent liabilities	90,554
Total liabilities assumed	$	149,562
Net assets acquired	$	730,861

EARNINGS PER SHARE (TWO-CLASS METHOD) (Tables)

12 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Computation of Basic and Diluted Earnings Per Share

The following table sets forth the computation of basic and diluted earnings per share (in thousands, except per share data):



	Fiscal Years Ended September 30,
	2015			2014			2013
Numerator for earnings per share:
Net income	$	447,212		$	306,910		$	302,789
Less dividends paid on participating securities	(3,365		)	(126,626		)	(171,243		)
Net income applicable to common stock—basic and diluted	$	443,847		$	180,284		$	131,546
Denominator for basic and diluted earnings per share under the two-class method:
Weighted average common shares outstanding	53,112			52,748			52,258
Vested options deemed participating securities	3,494			4,245			2,822
Total shares for basic and diluted earnings per share	56,606			56,993			55,080
Net earnings per share—basic and diluted	$	7.84		$	3.16		$	2.39

SALES AND TRADE ACCOUNTS RECEIVABLE (Tables)

12 Months Ended

Sep. 30, 2015

Receivables [Abstract]

Content Trade Accounts Receivable

Trade Accounts Receivable—Trade accounts receivable consist of the following at September 30 (in thousands):



	2015			2014
Trade accounts receivable—gross	$	447,873		$	355,398
Allowance for uncollectible accounts	(3,801		)	(4,091		)
Trade accounts receivable—net	$	444,072		$	351,307

INVENTORIES (Tables)

12 Months Ended

Sep. 30, 2015

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following at September 30 (in thousands):



	2015			2014
Raw materials and purchased component parts	$	371,073		$	298,318
Work-in-progress	164,793			146,980
Finished Goods	122,956			69,658
Total	658,822			514,956
Reserves for excess and obsolete inventory and LIFO	(67,421		)	(55,882		)
Inventories—net	$	591,401		$	459,074

PROPERTY, PLANT AND EQUIPMENT (Tables)

12 Months Ended

Sep. 30, 2015

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

Property, plant and equipment consist of the following at September 30 (in thousands):



	2015			2014
Land and improvements	$	42,235		$	33,722
Buildings and improvements	133,290			114,030
Machinery, equipment and other	283,670			235,642
Construction in progress	20,867			12,174
Total	480,062			395,568
Accumulated depreciation	(219,378		)	(183,460		)
Property, plant and equipment—net	$	260,684		$	212,108

INTANGIBLE ASSETS (Tables)

12 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets Subject to Amortization

Intangible assets subject to amortization consist of the following at September 30 (in thousands):



	2015						2014
	Gross Carrying Amount		Accumulated Amortization		Net		Gross Carrying Amount		Accumulated Amortization		Net
Technology	$	1,100,317	$	233,434	$	866,883	$	854,918	$	186,278	$	668,640
Order backlog	19,501		10,709		8,792		8,006		6,006		2,000
Other	43,229		13,557		29,672		43,252		11,259		31,993
Total	$	1,163,047	$	257,700	$	905,347	$	906,176	$	203,543	$	702,633

Information Regarding Amortization Expense of Amortizable Intangible Assets

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

Aggregate Amortization Expense:



Years ended September 30,
2015	$	54,219
2014	63,842
2013	46,208

Information Regarding Amortization Expense of Amortizable Intangible Assets

Estimated Amortization Expense:



Years ending September 30,
2016	$	66,355
2017	57,562
2018	57,562
2019	57,562
2020	57,562

Intangible Assets Acquired

Intangible assets acquired during the year ended September 30, 2015 were as follows (in thousands):



	Gross Amount		Amortization Period
Intangible assets not subject to amortization:
Goodwill	$	1,178,264
Trademarks and trade names	123,851
	1,302,115
Intangible assets subject to amortization:
Technology	248,193		20 years
Order backlog	11,529		1 year
	259,722		19.2 years
Total	$	1,561,837

Summary of Changes in Carrying Value of Goodwill

The changes in the carrying amount of goodwill by segment for the fiscal years ended September 30, 2014 and 2015 were as follows (in thousands):



	Power & Control		Airframe			Non- aviation		Total
Balance at September 30, 2013	$	1,554,308	$	1,734,519		$	55,080	$	3,343,907
Goodwill acquired during the year (Note 2)	—		178,514			—		178,514
Purchase price allocation adjustments	5,999		—			289		6,288
Other	3,140		(6,772		)	—		(3,632		)
Balance at September 30, 2014	1,563,447		1,906,261			55,369		3,525,077
Goodwill acquired during the year (Note 2)	674,123		504,141			—		1,178,264
Purchase price allocation adjustments	—		(4,541		)	—		(4,541		)
Other	873		(13,453		)	—		(12,580		)
Balance at September 30, 2015	$	2,238,443	$	2,392,408		$	55,369	$	4,686,220

ACCRUED LIABILITIES (Tables)

12 Months Ended

Sep. 30, 2015

Payables and Accruals [Abstract]

Accrued Liabilities

Accrued liabilities consist of the following at September 30 (in thousands):



	2015		2014
Interest	$	65,247	$	69,523
Compensation and related benefits	68,034		63,057
Interest rate swap agreements	24,770		20,070
Product warranties	20,592		14,243
Other	92,910		63,978
Total	$	271,553	$	230,871

DEBT (Tables)

12 Months Ended

Sep. 30, 2015

Debt Disclosure [Abstract]

Debt

The Company’s debt consists of the following at September 30 (in thousands):



	2015		2014
Short-term borrowings—trade receivable securitization facility	$	200,000	$	200,000
Term loans	$	4,377,342	$	3,873,131
2020 Notes	550,000		550,000
2021 Notes	500,000		500,000
2022 Notes	1,150,000		1,150,000
2024 Notes	1,200,000		1,200,000
2025 Notes	450,000		—
	8,227,342		7,273,131
Less current portion	43,840		39,295
Long-term debt	$	8,183,502	$	7,233,836

Future Maturities of Long-Term Debt

At September 30, 2015, future maturities of long-term debt are as follows (in thousands):




Years ended September 30,
2016	$	43,840
2017	43,840
2018	43,840
2019	43,840
2020	2,524,647
Thereafter	5,532,806
	$	8,232,813

INCOME TAXES (Tables)

12 Months Ended

Sep. 30, 2015

Income Tax Disclosure [Abstract]

Income Tax Provision on Income Before Income Taxes

The Company’s income tax provision on income before income taxes consists of the following for the periods shown below (in thousands):



	Fiscal Years Ended September 30,
	2015		2014			2013
Current
Federal	$	163,182	$	138,596		$	133,438
State	7,823		7,807			8,933
Foreign	17,947		4,613			5,943
	188,952		151,016			148,314
Deferred	660		(9,416		)	(2,614		)
	$	189,612	$	141,600		$	145,700

Differences between Income Tax Provision on Income Before Income Taxes at Federal Statutory Income Tax Rate and Tax Provision shown in Accompanying Consolidated Statements of Income



	Fiscal Years Ended September 30,
	2015			2014			2013
Tax at statutory rate of 35%	$	222,888		$	156,979		$	156,970
State and local income taxes, net of federal benefit	4,931			5,658			4,858
Domestic manufacturing deduction	(17,834		)	(13,980		)	(14,388		)
Foreign rate differential	(14,332		)	(4,034		)	(2,551		)
Other—net	(6,041		)	(3,023		)	811
Income tax provision	$	189,612		$	141,600		$	145,700

Components of Deferred Taxes

The components of the deferred taxes consist of the following at September 30 (in thousands):



	2015			2014
Deferred tax assets:
Employee benefits, compensation and other accrued obligations	$	65,245		$	60,457
Inventory	22,047			19,610
Net operating losses	15,945			16,345
Tax credits	2,230			11,343
Interest rate swaps and caps	29,811			9,258
Environmental	7,897			8,380
Product warranties	6,247			5,046
Other	5,952			2,364
Total	155,374			132,803
Less: Valuation allowance	(17,645		)	(24,267		)
Total deferred tax assets	137,729			108,536
Deferred tax liabilities:
Intangible assets	508,485			444,059
Property, plant and equipment	21,083			19,348
Unremitted foreign earnings	7,178			4,918
Other	5,980			4,789
Total deferred tax liabilities	542,726			473,114
Total net deferred tax liabilities	$	404,997		$	364,578

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 thousands):



	2015			2014
Balance at beginning of period	$	13,951		$	6,129
Additions based on tax positions related to the prior year	1,304			990
Additions based on tax positions related to the current year	—			886
Reductions based on tax positions related to the prior year	(2,099		)	—
Settlement with tax authorities	(957		)	—
Lapse in statute of limitations	(3,645		)	(1,139		)
Acquisitions	(1,695		)	7,085
Balance at end of period	$	6,859		$	13,951

SEGMENTS (Tables)

12 Months Ended

Sep. 30, 2015

Segment Reporting [Abstract]

Net Sales by Reportable Segment

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



	Fiscal Years Ended September 30,
	2015		2014		2013
Net sales to external customers
Power & Control	$	1,330,135	$	1,161,808	$	946,587
Airframe	1,280,706		1,115,594		877,174
Non-aviation	96,274		95,504		100,639
	$	2,707,115	$	2,372,906	$	1,924,400

EBITDA Defined by Segment to Consolidated Income Before Taxes Operations

The following table reconciles EBITDA As Defined by segment to consolidated income before income taxes (in thousands):



	Fiscal Years Ended September 30,
	2015			2014		2013
EBITDA As Defined
Power & Control	$	653,050		$	585,671	$	493,733
Airframe	585,472			494,076		406,283
Non-aviation	22,406			18,479		23,647
Total segment EBITDA As Defined	1,260,928			1,098,226		923,663
Unallocated corporate expenses	27,274			25,019		23,385
Total Company EBITDA As Defined	1,233,654			1,073,207		900,278
Depreciation and amortization	93,663			96,385		73,515
Interest expense, net	418,785			347,688		270,685
Acquisition-related costs	36,623			20,541		26,433
Stock compensation expense	31,500			26,332		48,884
Refinancing costs	18,393			131,622		30,281
Other items, net	(2,134		)	2,129		1,991
Income before income taxes	$	636,824		$	448,510	$	448,489

Capital Expenditures and Depreciation and Amortization by Segment

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



	Fiscal Years Ended September 30,
	2015		2014		2013
Capital expenditures
Power & Control	$	24,664	$	13,882	$	15,216
Airframe	28,086		17,096		17,054
Non-aviation	1,889		3,097		2,773
Corporate	232		71		492
	$	54,871	$	34,146	$	35,535
Depreciation and amortization
Power & Control	$	39,336	$	40,401	$	29,789
Airframe	50,355		50,311		40,757
Non-aviation	2,846		4,579		2,614
Corporate	1,126		1,094		355
	$	93,663	$	96,385	$	73,515

Total Assets by Segment

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



	September 30, 2015		September 30, 2014
Total assets
Power & Control	$	3,550,866	$	2,441,286
Airframe	3,923,137		3,255,538
Non-aviation	129,935		132,988
Corporate	823,112		927,036
	$	8,427,050	$	6,756,848

STOCK-BASED COMPENSATION (Tables)

12 Months Ended

Sep. 30, 2015

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



	Fiscal Years Ended September 30,
	2015	2014	2013
Risk-free interest rate	1.33% to 1.64%	1.71% to 2.03%	0.84% to 1.00%
Expected life of options	5 years	6 years	6 years
Expected dividend yield of stock	—	—	—
Expected volatility of stock	35%	35%	35%

Time Vested Stock Options

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

The following table summarizes activity, pricing and other information for the Company’s time vested stock-based award activity during the fiscal year ended September 30, 2015:



	Number of Options		Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2014	40,243		$	28.24
Granted	—		—
Exercised	(34,757	)	26.40
Forfeited	—		—
Outstanding at September 30, 2015	5,486		$	39.88	1.8 years	$	946,499
Exercisable at September 30, 2015	5,486		$	39.88	1.8 years	$	946,499

Performance Vested Stock Options | 2006 Stock Incentive Plan

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, 2015:



	Number of Options		Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2014	5,328,104		$	82.18
Granted	1,183,330		197.26
Exercised	(1,042,166	)	55.71
Forfeited	(203,725	)	145.77
Expired	—		—
Outstanding at September 30, 2015	5,265,543		$	110.82	6.3 years	$	534,926,513
Expected to vest	1,616,548		$	138.95	7.8 years	$	118,757,272
Exercisable at September 30, 2015	3,123,768		$	72.38	4.9 years	$	437,421,233

Performance Vested Stock Options | 2003 Stock Option Plan

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, 2015:



	Number of Options		Weighted-Average Exercise Price Per Option		Weighted-Average Remaining Contractual Term	Aggregate Intrinsic Value
Outstanding at September 30, 2014	284,268		$	48.48
Granted	—		—
Exercised	(171,252	)	15.72
Outstanding at September 30, 2015	113,016		$	98.11	5.3 years	$	12,917,729
Exercisable at September 30, 2015	35,187		$	27.38	1.1 years	$	6,510,651

FAIR VALUE MEASUREMENTS (Tables)

12 Months Ended

Sep. 30, 2015

Fair Value Disclosures [Abstract]

Carrying Amounts and Fair Values of Financial Instruments

The following summarizes the carrying amounts and fair values of financial instruments as of September 30 (in thousands):



		September 30, 2015				September 30, 2014
	Level	Carrying Amount		Fair Value		Carrying Amount		Fair Value
Assets:
Cash and cash equivalents	1	$	714,033	$	714,033	$	819,548	$	819,548
Interest rate cap agreements⁽¹⁾	2	8,180		8,180		—		—
Liabilities:
Interest rate swap agreements⁽²⁾	2	24,770		24,770		20,070		20,070
Interest rate swap agreements⁽³⁾	2	49,730		49,730		4,650		4,650
Short-term borrowings—trade receivable securitization facility	1	200,000		200,000		200,000		200,000
Long-term debt:
Term loans	2	4,377,342		4,344,000		3,873,131		3,821,000
2020 Notes	1	550,000		520,000		550,000		529,000
2021 Notes	1	500,000		524,000		500,000		531,000
2022 Notes	1	1,150,000		1,081,000		1,150,000		1,121,000
2024 Notes	1	1,200,000		1,119,000		1,200,000		1,182,000
2025 Notes	1	450,000		417,000		—		—


(1)	Included in Other non-current assets on the Condensed Consolidated Balance Sheet.


(2)	Included in Accrued liabilities on the Condensed Consolidated Balance Sheet.


(3)	Included in Other non-current liabilities on the Condensed Consolidated Balance Sheet.

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables)

12 Months Ended

Sep. 30, 2015

Equity [Abstract]

Accumulated Other Comprehensive Income (Loss)



	Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges			Defined benefit pension plan activity			Currency translation adjustment			Total
Balance at September 30, 2013	$	(9,722	)	$	(1,391	)	$	4,597		$	(6,516	)
Other comprehensive loss before reclassification	(10,366		)	(4,836		)	(7,653		)	(22,855		)
Amounts reclassified from AOCI related to interest rate swap agreements ⁽¹⁾	4,200			—			—			4,200
Net current-period other comprehensive loss	$	(6,166	)	$	(4,836	)	$	(7,653	)	$	(18,655	)
Balance at September 30, 2014	$	(15,888	)	$	(6,227	)	$	(3,056	)	$	(25,171	)
Other comprehensive loss before reclassification	(38,754		)	(5,786		)	(29,448		)	(73,988		)
Amounts reclassified from AOCI related to interest rate swap agreements ⁽¹⁾	3,150			—			—			3,150
Net current-period other comprehensive loss	$	(35,604	)	$	(5,786	)	$	(29,448	)	$	(70,838	)
Balance at September 30, 2015	$	(51,492	)	$	(12,013	)	$	(32,504	)	$	(96,009	)

(1) This component of AOCI is included in interest expense (see Note 20, "Derivatives and Hedging Activities," for additional details).

QUARTERLY FINANCIAL DATA (UNAUDITED) (Tables)

12 Months Ended

Sep. 30, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (Unaudited)



	First Quarter Ended December 27, 2014		Second Quarter Ended March 28, 2015		Third Quarter Ended June 27, 2015		Fourth Quarter Ended September 30, 2015
	(in thousands, except per share amounts)
Year Ended September 30, 2015
Net sales⁽²⁾	$	586,898	$	619,030	$	691,395	$	809,792
Gross profit⁽²⁾	321,173		341,617		359,455		427,600
Net income⁽²⁾	95,533		110,894		99,112		141,673
Net earnings per share—basic and diluted⁽¹⁾	$	1.63	$	1.96	$	1.75	$	2.50



	First Quarter Ended December 28, 2013		Second Quarter Ended March 29, 2014		Third Quarter Ended June 28, 2014			Fourth Quarter Ended September 30, 2014
	(in thousands, except per share amounts)
Year Ended September 30, 2014
Net sales⁽²⁾	$	529,322	$	590,761	$	610,582		$	642,241
Gross profit⁽²⁾	284,136		307,582		327,528			348,628
Net income⁽²⁾	86,123		90,355		16,177			114,255
Net earnings (loss) per share—basic and diluted⁽¹⁾	$	1.44	$	1.49	$	(1.66	)	$	1.91


(1)	The sum of the earnings per share for the four quarters in a year does not necessarily equal the total year earnings per share.


(2)	The Company’s operating results include the results of operations of acquisitions from the effective date of each acquisition. See Note 2 to the Consolidated Financial Statements.

SUPPLEMENTAL GUARANTOR INFORMATION (Tables)

12 Months Ended

Sep. 30, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Supplemental Condensed Consolidating Balance Sheet

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF SEPTEMBER 30, 2015

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors		Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	1,500		$	659,365		$	7,911	$	45,257		$	—		$	714,033
Trade accounts receivable—Net	—			(265		)	48,369		413,380			(17,412		)	444,072
Inventories—Net	—			34,457			461,103		96,541			(700		)	591,401
Deferred income taxes	—			44,677			—		698			—			45,375
Prepaid expenses and other	—			2,804			15,096		19,181			—			37,081
Total current assets	1,500			741,038			532,479		575,057			(18,112		)	1,831,962
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	(1,039,806		)	6,963,034			4,501,501		(33,208		)	(10,391,521		)	—
PROPERTY, PLANT AND EQUIPMENT—Net	—			16,565			201,499		42,620			—			260,684
GOODWILL	—			65,886			3,984,199		636,135			—			4,686,220
OTHER INTANGIBLE ASSETS—Net	—			38,621			1,236,376		266,315			(1,461		)	1,539,851
OTHER	—			91,244			14,528		2,561			—			108,333
TOTAL ASSETS	$	(1,038,306	)	$	7,916,388		$	10,470,582	$	1,489,480		$	(10,411,094	)	$	8,427,050
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
CURRENT LIABILITIES:
Current portion of long-term debt	$	—		$	43,840		$	—	$	—		$	—		$	43,840
Short-term borrowings—trade receivable securitization facility	—			—			—		200,000			—			200,000
Accounts payable	—			16,561			102,968		37,556			(14,263		)	142,822
Accrued liabilities	—			97,045			117,243		57,265			—			271,553
Total current liabilities	—			157,446			220,211		294,821			(14,263		)	658,215
LONG-TERM DEBT	—			8,183,502			—		—			—			8,183,502
DEFERRED INCOME TAXES	—			379,525			2,410		68,437			—			450,372
OTHER NON-CURRENT LIABILITIES	—			99,743			35,222		38,302			—			173,267
Total liabilities	—			8,820,216			257,843		401,560			(14,263		)	9,465,356
STOCKHOLDERS’ (DEFICIT) EQUITY	(1,038,306		)	(903,828		)	10,212,739		1,087,920			(10,396,831		)	(1,038,306		)
TOTAL LIABILITIES AND STOCKHOLDERS’ (DEFICIT) EQUITY	$	(1,038,306	)	$	7,916,388		$	10,470,582	$	1,489,480		$	(10,411,094	)	$	8,427,050

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING BALANCE SHEET

AS OF SEPTEMBER 30, 2014

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors		Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
ASSETS
CURRENT ASSETS:
Cash and cash equivalents	$	2,088		$	782,648		$	3,793	$	31,019		$	—		$	819,548
Trade accounts receivable—Net	—			(305		)	1,711		351,881			(1,980		)	351,307
Inventories—Net	—			32,287			382,016		45,471			(700		)	459,074
Deferred income taxes	—			37,669			—		—			—			37,669
Prepaid expenses and other	—			2,040			14,789		5,149			—			21,978
Total current assets	2,088			854,339			402,309		433,520			(2,680		)	1,689,576
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	(1,558,187		)	5,327,465			3,758,085		(59,788		)	(7,467,575		)	—
PROPERTY, PLANT AND EQUIPMENT—Net	—			15,884			167,257		28,967			—			212,108
GOODWILL	—			64,461			3,289,295		171,321			—			3,525,077
OTHER INTANGIBLE ASSETS—Net	—			40,066			1,092,011		86,536			(1,460		)	1,217,153
OTHER	—			100,000			11,754		1,180			—			112,934
TOTAL ASSETS	$	(1,556,099	)	$	6,402,215		$	8,720,711	$	661,736		$	(7,471,715	)	$	6,756,848
LIABILITIES AND STOCKHOLDERS’ EQUITY (DEFICIT)
CURRENT LIABILITIES:
Current portion of long-term debt	$	—		$	39,295		$	—	$	—		$	—		$	39,295
Short-term borrowings—trade receivable securitization facility	—			—			—		200,000			—			200,000
Accounts payable	—			17,629			85,328		14,768			(1,984		)	115,741
Accrued liabilities	—			106,631			98,308		25,932			—			230,871
Total current liabilities	—			163,555			183,636		240,700			(1,984		)	585,907
LONG-TERM DEBT	—			7,233,836			—		—			—			7,233,836
DEFERRED INCOME TAXES	—			402,538			—		(291		)	—			402,247
OTHER NON-CURRENT LIABILITIES	—			42,470			42,445		6,042			—			90,957
Total liabilities	—			7,842,399			226,081		246,451			(1,984		)	8,312,947
STOCKHOLDERS’ (DEFICIT) EQUITY	(1,556,099		)	(1,440,184		)	8,494,630		415,285			(7,469,731		)	(1,556,099		)
TOTAL LIABILITIES AND STOCKHOLDERS’ (DEFICIT) EQUITY	$	(1,556,099	)	$	6,402,215		$	8,720,711	$	661,736		$	(7,471,715	)	$	6,756,848

Supplemental Condensed Consolidating Statement of Income and Comprehensive Income

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME

FOR THE YEAR ENDED SEPTEMBER 30, 2015

(Amounts in thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET SALES	$	—		$	131,378		$	2,262,842		$	324,675		$	(11,780	)	$	2,707,115
COST OF SALES	—			79,174			973,908			215,968			(11,780		)	1,257,270
GROSS PROFIT	—			52,204			1,288,934			108,707			—			1,449,845
SELLING AND ADMINISTRATIVE EXPENSES	—			72,792			197,914			50,918			—			321,624
AMORTIZATION OF INTANGIBLE ASSETS	—			1,392			45,337			7,490			—			54,219
(LOSS) INCOME FROM OPERATIONS	—			(21,980		)	1,045,683			50,299			—			1,074,002
INTEREST EXPENSE (INCOME)—Net	—			430,224			(487		)	(10,952		)	—			418,785
REFINANCING COSTS	—			18,393			—			—			—			18,393
EQUITY IN INCOME OF SUBSIDIARIES	(447,212		)	(773,510		)	—			—			1,220,722			—
INCOME BEFORE INCOME TAXES	447,212			302,913			1,046,170			61,251			(1,220,722		)	636,824
INCOME TAX (BENEFIT) PROVISION	—			(144,299		)	315,017			18,894			—			189,612
NET INCOME	$	447,212		$	447,212		$	731,153		$	42,357		$	(1,220,722	)	$	447,212
OTHER COMPREHENSIVE (LOSS) INCOME, NET OF TAX	(70,838		)	(55,338		)	770			(29,147		)	83,715			(70,838		)
TOTAL COMPREHENSIVE INCOME	$	376,374		$	391,874		$	731,923		$	13,210		$	(1,137,007	)	$	376,374

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME

FOR THE YEAR ENDED SEPTEMBER 30, 2014

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET SALES	$	—		$	125,389		$	2,051,541		$	206,952		$	(10,976	)	$	2,372,906
COST OF SALES	—			74,312			895,041			146,878			(11,199		)	1,105,032
GROSS PROFIT	—			51,077			1,156,500			60,074			223			1,267,874
SELLING AND ADMINISTRATIVE EXPENSES	—			65,272			176,516			34,658			—			276,446
AMORTIZATION OF INTANGIBLE ASSETS	—			1,388			55,730			6,490			—			63,608
(LOSS) INCOME FROM OPERATIONS	—			(15,583		)	924,254			18,926			223			927,820
INTEREST EXPENSE (INCOME)—Net	—			349,289			(36		)	(1,565		)	—			347,688
REFINANCING COSTS	—			131,622			—			—			—			131,622
EQUITY IN INCOME OF SUBSIDIARIES	(306,910		)	(639,539		)	—			—			946,449			—
INCOME BEFORE INCOME TAXES	306,910			143,045			924,290			20,491			(946,226		)	448,510
INCOME TAX (BENEFIT) PROVISION	—			(163,865		)	293,961			11,504			—			141,600
NET INCOME	$	306,910		$	306,910		$	630,329		$	8,987		$	(946,226	)	$	306,910
OTHER COMPREHENSIVE LOSS, NET OF TAX	(18,655		)	(3,951		)	(1,520		)	(13,184		)	18,655			(18,655		)
TOTAL COMPREHENSIVE INCOME (LOSS)	$	288,255		$	302,959		$	628,809		$	(4,197	)	$	(927,571	)	$	288,255

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF INCOME AND COMPREHENSIVE INCOME

FOR THE YEAR ENDED SEPTEMBER 30, 2013

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors		Non-Guarantor Subsidiaries		Eliminations			Total Consolidated
NET SALES	$	—		$	110,608		$	1,699,742	$	120,706	$	(6,656	)	$	1,924,400
COST OF SALES	—			66,524			732,812		81,583		(6,081		)	874,838
GROSS PROFIT	—			44,084			966,930		39,123		(575		)	1,049,562
SELLING AND ADMINISTRATIVE EXPENSES	—			88,286			147,620		17,180		1,382			254,468
AMORTIZATION OF INTANGIBLE ASSETS	—			624			43,265		1,750		—			45,639
(LOSS) INCOME FROM OPERATIONS	—			(44,826		)	776,045		20,193		(1,957		)	749,455
INTEREST EXPENSE—Net	—			267,385			2,028		1,272		—			270,685
REFINANCING COSTS	—			30,281			—		—		—			30,281
EQUITY IN INCOME OF SUBSIDIARIES	(302,789		)	(505,199		)	—		—		807,988			—
INCOME BEFORE INCOME TAXES	302,789			162,707			774,017		18,921		(809,945		)	448,489
INCOME TAX (BENEFIT) PROVISION	—			(140,082		)	272,829		12,953		—			145,700
NET INCOME	$	302,789		$	302,789		$	501,188	$	5,968	$	(809,945	)	$	302,789
OTHER COMPREHENSIVE INCOME (LOSS), NET OF TAX	1,535			(4,515		)	950		5,100		(1,535		)	1,535
TOTAL COMPREHENSIVE INCOME	$	304,324		$	298,274		$	502,138	$	11,068	$	(811,480	)	$	304,324

Supplemental Condensed Consolidating Statement of Cash Flows

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE YEAR ENDED SEPTEMBER 30, 2015

(Amounts in thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	—		$	(298,797	)	$	734,130		$	82,451		$	3,154		$	520,938
INVESTING ACTIVITIES:
Capital expenditures	—			(2,871		)	(44,564		)	(7,436		)	—			(54,871		)
Acquisition of business, net of cash acquired	—			(1,624,278		)	—			—			—			(1,624,278		)
Net cash used in investing activities	—			(1,627,149		)	(44,564		)	(7,436		)	—			(1,679,149		)
FINANCING ACTIVITIES:
Intercompany activities	(120,862		)	867,990			(685,448		)	(58,526		)	(3,154		)	—
Excess tax benefits related to share-based payment arrangements	61,965			—			—			—			—			61,965
Proceeds from exercise of stock options	61,674			—			—			—			—			61,674
Dividends paid	(3,365		)	—			—			—			—			(3,365		)
Proceeds from 2015 Term Loans, net	—			1,505,673			—			—			—			1,505,673
Proceeds from term loans, net	—			10,281			—			—			—			10,281
Proceeds from Revolving Commitment	—			75,250			—			—			—			75,250
Repayment on 2015 Term Loans	—			(7,330		)	—			—			—			(7,330		)
Repayment on term loans	—			(1,017,988		)	—			—			—			(1,017,988		)
Repayment on Revolving Commitment	—			(75,250		)	—			—			—			(75,250		)
Proceeds from 2025 Notes, net	—			445,303			—			—			—			445,303
Other	—			(1,266		)	—			—			—			(1,266		)
Net cash (used in) provided by financing activities	(588		)	1,802,663			(685,448		)	(58,526		)	(3,154		)	1,054,947
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			—			(2,251		)	—			(2,251		)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(588		)	(123,283		)	4,118			14,238			—			(105,515		)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,088			782,648			3,793			31,019			—			819,548
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1,500		$	659,365		$	7,911		$	45,257		$	—		$	714,033

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE YEAR ENDED SEPTEMBER 30, 2014

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	—		$	(123,074	)	$	952,855		$	(303,763	)	$	15,204		$	541,222
INVESTING ACTIVITIES:
Capital expenditures	—			(2,666		)	(28,927		)	(2,553		)	—			(34,146		)
Acquisition of business, net of cash acquired	—			(311,872		)	—			—			—			(311,872		)
Cash proceeds from sale of real estate	—			—			16,380			—			—			16,380
Net cash used in investing activities	—			(314,538		)	(12,547		)	(2,553		)	—			(329,638		)
FINANCING ACTIVITIES:
Intercompany activities	1,533,571			(694,208		)	(944,415		)	120,256			(15,204		)	—
Excess tax benefits related to share-based payment arrangements	51,709			—			—			—			—			51,709
Proceeds from exercise of stock options	26,738			—			—			—			—			26,738
Dividends paid	(1,451,391		)	—			—			—			—			(1,451,391		)
Treasury stock purchased	(159,852		)	—			—			—			—			(159,852		)
Proceeds from term loans, net	—			805,360			—			—			—			805,360
Repayment on term loans	—			(33,107		)	—			—			—			(33,107		)
Proceeds from senior subordinated notes, net	—			2,326,393			—			—			—			2,326,393
Repurchase of 2018 Notes	—			(1,721,014		)	—			—			—			(1,721,014		)
Proceeds from trade receivable securitization facility, net	—			—			—			199,164			—			199,164
Other	—			(27		)	—			—			—			(27		)
Net cash provided by (used in) financing activities	775			683,397			(944,415		)	319,420			(15,204		)	43,973
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			—			(749		)	—			(749		)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	775			245,785			(4,107		)	12,355			—			254,808
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,313			536,863			7,900			18,664			—			564,740
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	2,088		$	782,648		$	3,793		$	31,019		$	—		$	819,548

TRANSDIGM GROUP INCORPORATED

CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS

FOR THE YEAR ENDED SEPTEMBER 30, 2013

(Amounts in Thousands)



	TransDigm Group			TransDigm Inc.			Subsidiary Guarantors			Non-Guarantor Subsidiaries			Eliminations			Total Consolidated
NET CASH (USED IN) PROVIDED BY OPERATING ACTIVITIES	$	—		$	(95,862	)	$	565,957		$	8,703		$	(8,593	)	$	470,205
INVESTING ACTIVITIES:
Capital expenditures	—			(2,047		)	(29,727		)	(3,761		)	—			(35,535		)
Acquisition of businesses, net of cash acquired				(483,257		)	—			—			—			(483,257		)
Cash proceeds from sale of investment	—			16,350			—			—			—			16,350
Net cash used in investing activities	—			(468,954		)	(29,727		)	(3,761		)	—			(502,442		)
FINANCING ACTIVITIES:
Intercompany activities	1,884,828			(1,365,022		)	(532,824		)	4,425			8,593			—
Excess tax benefits related to share-based payment arrangements	66,201			—			—			—			—			66,201
Proceeds from exercise of stock options	21,534			—			—			—			—			21,534
Dividends paid	(1,991,350		)	—			—			—			—			(1,991,350		)
Proceeds from term loans, net	—			3,211,374			—			—			—			3,211,374
Repayment on term loans	—			(2,187,885		)	—			—			—			(2,187,885		)
Proceeds from senior subordinated notes, net	—			1,036,321			—			—			—			1,036,321
Net cash (used in) provided by financing activities	(18,787		)	694,788			(532,824		)	4,425			8,593			156,195
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS	—			—			—			258			—			258
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(18,787		)	129,972			3,406			9,625			—			124,216
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	20,100			406,891			4,494			9,039			—			440,524
CASH AND CASH EQUIVALENTS, END OF PERIOD	$	1,313		$	536,863		$	7,900		$	18,664		$	—		$	564,740

Description of The Business - Additional Information (Detail)	Sep. 30, 2015
Accounting Policies [Abstract]
Percentage of ownership in subsidiary	100.00%

Acquisitions - Additional Information (Detail) - USD ($)									12 Months Ended
	Aug. 19, 2015	May 14, 2015	Mar. 31, 2015	Mar. 26, 2015	Mar. 06, 2014	Dec. 19, 2013	Jun. 28, 2013	Jun. 05, 2013	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Goodwill									$ 4,686,220,000	$ 3,525,077,000	$ 3,343,907,000
Proceeds from credit facility-net									$ 10,281,000	805,360,000	3,211,374,000
Minimum
Business Acquisition [Line Items]
Estimated useful life of aircraft (in years)									25 years
Maximum
Business Acquisition [Line Items]
Estimated useful life of aircraft (in years)									30 years
PneuDrualics, Inc.
Business Acquisition [Line Items]
Business acquisition cost	$ 323,500,000
Tax benefits	$ 108,000,000
Tax benefit recognition period (in years)	15 years
Goodwill	$ 190,800,000
Pexco Aerospace, Inc.
Business Acquisition [Line Items]
Business acquisition cost		$ 496,400,000
Tax benefits		$ 172,000,000
Tax benefit recognition period (in years)		15 years
Business acquisition purchase price adjustment									$ 400,000
Amount of goodwill expected to be tax deductible		$ 407,800,000
Adams Rite Aerospace GmbH
Business Acquisition [Line Items]
Business acquisition cost			$ 75,300,000
Goodwill			$ 63,900,000
Telair Cargo Group
Business Acquisition [Line Items]
Business acquisition cost				$ 730,900,000
Goodwill				515,690,000
Business acquisition purchase price adjustment									7,700,000
Amount of goodwill expected to be tax deductible				35,100,000
Goodwill				480,600,000
Business acquisition, assumption of net indebtedness				149,562,000
Elektro-Metall Export GmbH
Business Acquisition [Line Items]
Business acquisition cost					$ 49,600,000
Goodwill					20,300,000
Cash consideration paid to acquire business					40,400,000
Business acquisition, assumption of net indebtedness					$ 9,200,000
Airborne Systems Inc
Business Acquisition [Line Items]
Goodwill						$ 158,200,000
Cash consideration paid to acquire business						$ 264,200,000
Whippany Actuation Systems LLC
Business Acquisition [Line Items]
Amount of goodwill expected to be tax deductible							$ 105,100,000
Cash consideration paid to acquire business							$ 151,500,000
Arkwin Industries, Inc
Business Acquisition [Line Items]
Goodwill								$ 184,900,000
Cash consideration paid to acquire business								285,700,000
Aerosonic Corporation
Business Acquisition [Line Items]
Goodwill								14,800,000
Cash consideration paid to acquire business								$ 39,800,000
6.50% Senior Subordinated Notes, Due 2025
Business Acquisition [Line Items]
Debt instrument, outstanding		$ 450,000,000.0
Revolving Commitment
Business Acquisition [Line Items]
Proceeds from credit facility-net				$ 75,300,000					$ 75,250,000	$ 0	$ 0

ACQUISITIONS Business Combinations Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Mar. 26, 2015	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]
Goodwill	$ 4,686,220		$ 3,525,077	$ 3,343,907
Telair Cargo Group
Business Acquisition [Line Items]
Current assets, excluding cash acquired		$ 143,417
Property, plant, and equipment		16,011
Intangible assets		203,860
Goodwill		515,690
Other		1,445
Total assets acquired		880,423
Current liabilities		59,008
Other noncurrent liabilities		90,554
Total liabilities assumed		149,562
Net assets acquired		$ 730,861

Summary Of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Summary Of Significant Accounting Policies [Line Items]
Research and development expense	$ 48.3	$ 42.3	$ 32.1
Finite lived intangible asset useful life	19 years 2 months 12 days
Land Improvements \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Land Improvements \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	20 years
Building and improvements \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Building and improvements \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	30 years
Machinery and equipment \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	2 years
Machinery and equipment \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Furniture and Fixtures \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	3 years
Furniture and Fixtures \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	10 years
Technology Intangible Assets \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years
Technology Intangible Assets \| Maximum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	22 years
Order backlog
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	1 year
Order backlog \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	1 year
Other intangible assets \| Minimum
Summary Of Significant Accounting Policies [Line Items]
Finite lived intangible asset useful life	20 years

RECENT ACCOUNTING PRONOUNCEMENTS (Details) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Assets
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt issue cost	$ 77.7	$ 92.4

Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Numerator for earnings per share:
Net income	$ 447,212	$ 306,910	$ 302,789
Less dividends paid on participating securities	(3,365)	(126,626)	(171,243)
Net income applicable to common stock-basic and diluted	$ 443,847	$ 180,284	$ 131,546
Denominator for basic and diluted earnings per share under the two-class method:
Weighted average common shares outstanding	53,112	52,748	52,258
Vested options deemed participating securities	3,494	4,245	2,822
Total shares for basic and diluted earnings per share (shares)	56,606	56,993	55,080
Net earnings per share-basic and diluted (in dollars per share)	$ 7.84	$ 3.16	$ 2.39

- Definition

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

+ References + Details

SALES AND TRADE ACCOUNTS RECEIVABLE Sales and Trade Accounts Receivable - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Trade Accounts Receivable Securitization and Sale Program [Line Items]
NET SALES	$ 2,707,115	$ 2,372,906	$ 1,924,400
Percentage of trade accounts receivables from one company	14.00%
Trade accounts receivable due from foreign entities	44.00%
Customer 1 \| Sales Revenue, Net
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Percentage of net sales from one customer	12.00%	12.00%	13.00%
Customer 2 \| Sales Revenue, Net
Trade Accounts Receivable Securitization and Sale Program [Line Items]
Percentage of net sales from one customer	11.00%	8.00%	8.00%
Sales to foreign customers, primarily in Western Europe, Canada and Asia
Trade Accounts Receivable Securitization and Sale Program [Line Items]
NET SALES	$ 881,100	$ 735,900	$ 572,000

SALES AND TRADE ACCOUNTS RECEIVABLE Content Trade Accounts Receivable (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Receivables [Abstract]
Trade accounts receivable—gross	$ 447,873	$ 355,398
Allowance for uncollectible accounts	(3,801)	(4,091)
Trade accounts receivable—net	$ 444,072	$ 351,307

Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Inventory Disclosure [Abstract]
Raw materials and purchased component parts	$ 371,073	$ 298,318
Work-in-progress	164,793	146,980
Finished Goods	122,956	69,658
Total	658,822	514,956
Reserves for excess and obsolete inventory and LIFO	(67,421)	(55,882)
Inventories—net	$ 591,401	$ 459,074

Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Abstract]
Land and improvements	$ 42,235	$ 33,722
Buildings and improvements	133,290	114,030
Machinery, equipment and other	283,670	235,642
Construction in progress	20,867	12,174
Total	480,062	395,568
Accumulated depreciation	(219,378)	(183,460)
Property, plant and equipment-net	$ 260,684	$ 212,108

INTANGIBLE ASSETS Intangible Assets Subjects to Amortization (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,163,047	$ 906,176
Accumulated Amortization	257,700	203,543
Net	905,347	702,633
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,100,317	854,918
Accumulated Amortization	233,434	186,278
Net	866,883	668,640
Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	19,501	8,006
Accumulated Amortization	10,709	6,006
Net	8,792	2,000
Other intangible assets
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	43,229	43,252
Accumulated Amortization	13,557	11,259
Net	$ 29,672	$ 31,993

INTANGIBLE ASSETS Aggregate Amortization Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Goodwill and Intangible Assets Disclosure [Abstract]
Aggregate amortization expense	$ 54,219	$ 63,842	$ 46,208
Estimated Amortization Expense, 2016	66,355
Estimated Amortization Expense, 2017	57,562
Estimated Amortization Expense, 2018	57,562
Estimated Amortization Expense, 2019	57,562
Estimated Amortization Expense, 2020	$ 57,562

INTANGIBLE ASSETS Intangible Assets Acquired (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,178,264	$ 178,514
Intangible assets not subject to amortization	1,302,115
Intangible assets subject to amortization	259,722
Total - Intangible assets both subject to and not subject to amortization	$ 1,561,837
Amortization Period (in years)	19 years 2 months 12 days
Goodwill
Acquired Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 1,178,264
Trademarks and trade names
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets not subject to amortization	123,851
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 248,193
Amortization Period (in years)	20 years
Order backlog
Acquired Finite-Lived Intangible Assets [Line Items]
Intangible assets subject to amortization	$ 11,529
Amortization Period (in years)	1 year

INTANGIBLE ASSETS Summary of Changes in Carrying Value of Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Goodwill [Line Items]
Goodwill, Beginning Balance	$ 3,525,077	$ 3,343,907
Goodwill acquired during the year	1,178,264	178,514
Purchase price allocation adjustments	(4,541)	6,288
Other	(12,580)	(3,632)
Goodwill, Ending Balance	4,686,220	3,525,077
Power & Control
Goodwill [Line Items]
Goodwill, Beginning Balance	1,563,447	1,554,308
Goodwill acquired during the year	674,123	0
Purchase price allocation adjustments	0	5,999
Other	873	3,140
Goodwill, Ending Balance	2,238,443	1,563,447
Airframe
Goodwill [Line Items]
Goodwill, Beginning Balance	1,906,261	1,734,519
Goodwill acquired during the year	504,141	178,514
Purchase price allocation adjustments	(4,541)	0
Other	(13,453)	(6,772)
Goodwill, Ending Balance	2,392,408	1,906,261
Non-aviation
Goodwill [Line Items]
Goodwill, Beginning Balance	55,369	55,080
Goodwill acquired during the year	0	0
Purchase price allocation adjustments	0	289
Other	0	0
Goodwill, Ending Balance	$ 55,369	$ 55,369

Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Payables and Accruals [Abstract]
Interest	$ 65,247	$ 69,523
Compensation and related benefits	68,034	63,057
Interest rate swap agreements	24,770	20,070
Product warranties	20,592	14,243
Other	92,910	63,978
Total	$ 271,553	$ 230,871

Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Debt Instrument [Line Items]
Short-term borrowings - trade receivable securitization facility	$ 200,000	$ 200,000
Total debt outstanding	8,227,342	7,273,131
Less current portion	43,840	39,295
LONG-TERM DEBT	8,183,502	7,233,836
Term Loans
Debt Instrument [Line Items]
Debt instrument, outstanding	4,377,342	3,873,131
5.50% Senior Subordinated Notes, Due 2020
Debt Instrument [Line Items]
Debt instrument, outstanding	550,000	550,000
7.50% Senior Subordinated Notes, Due 2021
Debt Instrument [Line Items]
Debt instrument, outstanding	500,000	500,000
6.00% Senior Subordinated Notes, Due 2022
Debt Instrument [Line Items]
Debt instrument, outstanding	1,150,000	1,150,000
6.50% Senior Subordinated Notes, Due 2024
Debt Instrument [Line Items]
Debt instrument, outstanding	1,200,000	1,200,000
6.50% Senior Subordinated Notes, Due 2025
Debt Instrument [Line Items]
Debt instrument, outstanding	$ 450,000	$ 0

Debt - Additional Information (Detail)								1 Months Ended		12 Months Ended
Debt - Additional Information (Detail)	Jun. 30, 2015 USD ($)	May 14, 2015 USD ($)	Sep. 30, 2014 USD ($) $ / shares	Jun. 04, 2014 USD ($) $ / shares	Jul. 01, 2013 USD ($)	Mar. 28, 2013 USD ($)	Oct. 15, 2012 USD ($)	Aug. 31, 2015 USD ($)	Jun. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) agreements $ / shares	Sep. 30, 2014 USD ($) $ / shares	Sep. 30, 2013 USD ($)	Jul. 31, 2015 USD ($)	Jun. 26, 2015 USD ($)	May 20, 2015 USD ($)
Debt Instrument [Line Items]
Maximum borrowing capacity															$ 550,000,000.0
Trade receivable securitization facility			$ 200,000,000							$ 200,000,000	$ 200,000,000
Common stock par value \| $ / shares			$ 0.01							$ 0.01	$ 0.01
Debt instrument, face amount										$ 8,232,813,000
Quarterly principal payments	$ 7,300,000					$ 7,800,000
Quarterly principal payments, beginning date	Jun. 30, 2015					Mar. 28, 2013
Unamortized original issue discount										5,400,000
Increase in commitments															$ 130,000,000
Letter of credit outstanding										16,000,000
Borrowings available under credit facility										534,000,000
REFINANCING COSTS										18,393,000	$ 131,622,000	$ 30,281,000
Redemption premium of the 2018 Notes included in refinancing costs											121,100,000
Write-off of debt issuance costs											$ 10,500,000
Asset-backed Securities
Debt Instrument [Line Items]
Debt instrument extensions period											1 year
Trade receivable securitization facility										$ 200,000,000
Matured Securitization Facility due August 7, 2015 \| Asset-backed Securities
Debt Instrument [Line Items]
Maximum borrowing capacity													$ 225,000,000
Amended Securitization Facility due August 2, 2016 \| Asset-backed Securities
Debt Instrument [Line Items]
Maximum borrowing capacity								$ 250,000,000
Line of Credit facility expiration date								Aug. 02, 2016
Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 420,000,000
Common stock par value \| $ / shares				$ 0.0001
Second Amended and Restated Credit Agreement \| Maximum
Debt Instrument [Line Items]
Total special dividends up to amount				$ 1,700,000,000.0
Incremental Assumption and Refinancing Facility Agreement
Debt Instrument [Line Items]
Quarterly principal payments	$ 3,700,000
7.75% Senior Subordinated Notes, Due 2018
Debt Instrument [Line Items]
Senior subordinate note, due date										2018	2018
Repayments of Subordinated Debt									$ 1,721,014,000
2014 Credit Facility
Debt Instrument [Line Items]
Principal amount up to				$ 1,000,000,000.0
Floor basis spread on LIBOR										0.75%
Applicable interest rate on term loan										3.75%
Term loan mandatory principal prepayment commencement period from fiscal year (days)										90 days
Percentage of principal amount of term loan to be prepaid										100.00%
TransDigm's Foreign Subsidiaries
Debt Instrument [Line Items]
Percentage of voting capital stock				65.00%
2013 Credit Facility
Debt Instrument [Line Items]
Interest rate swap, notional amount														$ 353,000,000
Fixed rate of interest under interest rate swap														5.17%
Margin percent										2.20%				2.20%
Variable rate										3.00%				3.00%
Interest rate swap agreements description										2.2% plus the 3% margin percentage
2015 Term Loans
Debt Instrument [Line Items]
Floor basis spread on LIBOR										0.75%
Applicable interest rate on term loan										3.50%
Prepayment premium										1.00%
Senior Subordinated Notes
Debt Instrument [Line Items]
Debt instrument, face amount				$ 2,350,000,000.000
Percentage of principal amount of debt on issue price				100.00%
Senior Subordinated Notes \| 5.50% Senior Subordinated Notes, Due 2020
Debt Instrument [Line Items]
Debt instrument, face amount							$ 550,000,000
Percentage of principal amount of debt on issue price							100.00%
Debt instrument interest rate stated percentage							5.50%
Senior Subordinated Notes \| 7.50% Senior Subordinated Notes, Due 2021
Debt Instrument [Line Items]
Debt instrument, face amount					$ 500,000,000
Percentage of principal amount of debt on issue price					100.00%
Debt instrument interest rate stated percentage					7.50%
Senior Subordinated Notes \| 6.00% Senior Subordinated Notes, Due 2022
Debt Instrument [Line Items]
Debt instrument, face amount				$ 1,150,000,000.000
Debt instrument, maturity date				Jul. 15, 2022
Debt instrument interest rate stated percentage				6.00%
Frequency of interest repayment										semiannually in arrears on January 15 and July 15 of each year, commencing on January 15, 2015
Senior Subordinated Notes \| 6.50% Senior Subordinated Notes, Due 2025
Debt Instrument [Line Items]
Debt instrument, face amount		$ 450,000,000
Percentage of principal amount of debt on issue price		100.00%
Debt instrument interest rate stated percentage		6.50%
6.50% Senior Subordinated Notes, Due 2024
Debt Instrument [Line Items]
Senior subordinate note, due date										2024	2024
Debt instrument, face amount				$ 1,200,000,000.000
Debt instrument, maturity date				Jul. 15, 2024
Debt instrument interest rate stated percentage				6.50%
Frequency of interest repayment										semiannually in arrears on January 15 and July 15 of each year, commencing on January 15, 2015.
Tranche D
Debt Instrument [Line Items]
Debt instrument, face amount				$ 825,000,000
Debt instrument, maturity date				Jun. 04, 2021
Tranche D \| Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Debt instrument, face amount				$ 825,000,000
Debt instrument, maturity date				Jun. 04, 2021
Multicurrency borrowing sublimit \| Second Amended and Restated Credit Agreement
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 100,000,000
Tranche B
Debt Instrument [Line Items]
Debt instrument, face amount				500,000,000
Tranche B \| Incremental Assumption and Refinancing Facility Agreement
Debt Instrument [Line Items]
Debt instrument, face amount		$ 498,000,000
Tranche C
Debt Instrument [Line Items]
Debt instrument, face amount				$ 2,600,000,000
Debt instrument, maturity date				Feb. 28, 2020
Additional Payment
Debt Instrument [Line Items]
Quarterly principal payments			$ 2,100,000
Quarterly principal payments, beginning date			Sep. 30, 2014
Tranche E \| Incremental Assumption and Refinancing Facility Agreement
Debt Instrument [Line Items]
Debt instrument, face amount		$ 1,000,000,000.0
Forward-starting interest rate swap agreements beginning March 31, 2016
Debt Instrument [Line Items]
Number of interestrate swap agreements \| agreements										5
Interest rate swap, notional amount										$ 750,000,000
Fixed rate of interest under interest rate swap										5.80%
Margin percent										2.80%
Variable rate										3.00%
Interest rate swap agreements description										2.8% plus the 3% margin percentage
Interest rate swap agreements beginning September 30, 2014
Debt Instrument [Line Items]
Number of interestrate swap agreements \| agreements										3
Interest rate swap, notional amount										$ 1,000,000,000
Fixed rate of interest under interest rate swap										5.40%
Margin percent										2.40%
Variable rate										3.00%
Interest rate swap agreements description										2.4% plus the 3% margin percentage
Interest rate swap agreements to swap variable rates on the credit facility for a fixed rate
Debt Instrument [Line Items]
Number of interestrate swap agreements \| agreements										3
Interest Rate Cap
Debt Instrument [Line Items]
Number of interestrate swap agreements \| agreements										6
Interest rate swap, notional amount										$ 750,000,000
Fixed rate of interest under interest rate swap										2.50%

DEBT - Future Maturities of Long- Term Debt (Detail) $ in Thousands	Sep. 30, 2015 USD ($)
Debt Disclosure [Abstract]
Year ended September 30, 2016	$ 43,840
Year ended September 30, 2017	43,840
Year ended September 30, 2018	43,840
Year ended September 30, 2019	43,840
Year ended September 30, 2020	2,524,647
Thereafter	5,532,806
Total	$ 8,232,813

Retirement Plans - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Defined Benefit Plan Disclosure [Line Items]
Defined contribution plan, cost recognized	$ 9.9	$ 8.7	$ 6.6
Non-contributory defined benefit pension plans, qualified	The Company maintains certain qualified, non-contributory defined benefit pension plans, which together cover certain union employees.
Defined benefit plan, assets	$ 65.5	69.5
Defined benefit plan, accumulated benefit obligation	81.5	77.6
Defined benefit pension plan, liabilities	16.0	8.1
Net period pension, cost recognized	0.6	0.5	0.8
Total liabilities	8.4	9.0
Non-qualified
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, net periodic pension cost	$ 0.4	$ 0.4	$ 0.4

Income Tax Provision on Income Before Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Current
Federal	$ 163,182	$ 138,596	$ 133,438
State	7,823	7,807	8,933
Foreign	17,947	4,613	5,943
Total Current	188,952	151,016	148,314
Deferred	660	(9,416)	(2,614)
Income tax provision	$ 189,612	$ 141,600	$ 145,700

INCOME TAXES - Income Tax Expense Reconciliation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Income Tax Disclosure [Abstract]
Tax at statutory rate of 35%	$ 222,888	$ 156,979	$ 156,970
State and local income taxes, net of federal benefit	4,931	5,658	4,858
Domestic manufacturing deduction	(17,834)	(13,980)	(14,388)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(14,332)	(4,034)	(2,551)
Other-net	(6,041)	(3,023)	811
Income tax provision	$ 189,612	$ 141,600	$ 145,700
Statutory tax rate	35.00%	35.00%	35.00%

Components of Deferred Taxes (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Employee benefits, compensation and other accrued obligations	$ 65,245	$ 60,457
Inventory	22,047	19,610
Net operating losses	15,945	16,345
Tax credits	2,230	11,343
Interest rate swaps	29,811	9,258
Environmental	7,897	8,380
Product warranties	6,247	5,046
Other	5,952	2,364
Total	155,374	132,803
Less: Valuation allowance	(17,645)	(24,267)
Total deferred tax assets	137,729	108,536
Intangible assets	508,485	444,059
Property, plant and equipment	21,083	19,348
Unremitted foreign earnings	7,178	4,918
Other	5,980	4,789
Total deferred tax liabilities	542,726	473,114
Total net deferred tax liabilities	$ 404,997	$ 364,578

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Income Tax Contingency [Line Items]
Deferred tax asset foreign tax credit carryforward	$ 0.4
Foreign tax credit carryforwards expiration, years	2018 to 2022
State tax credit carryforward	$ 1.8
State tax credit carryforward expiration period	2023 to 2029
Foreign undistributed net earnings for which no deferred taxes have been provided	$ 39.5
Effect of unrecognized tax benefits on effective tax rate	6.5	$ 13.5
Accrual for income tax penalties and interest	1.4	$ 2.9
Federal and United Kingdom
Income Tax Contingency [Line Items]
Net operating loss carryforward	24.9
State
Income Tax Contingency [Line Items]
Net operating loss carryforward	$ 268.0
Minimum
Income Tax Contingency [Line Items]
Net tax loss carryforwards, expiration years	2015
Maximum
Income Tax Contingency [Line Items]
Net tax loss carryforwards, expiration years	2032

INCOME TAXES - Reconciliation of Beginning and Ending Amount of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 13,951	$ 6,129
Additions based on tax positions related to the prior year	1,304	990
Additions based on tax positions related to the current year	0	886
Reductions based on tax positions related to the prior year	(2,099)	0
Settlement with tax authorities	(957)	0
Lapse in statute of limitations	(3,645)	(1,139)
Acquisitions	(1,695)	7,085
Balance at end of period	$ 6,859	$ 13,951

Environmental Liabilities - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Sep. 30, 2014
Environmental Remediation Obligations [Abstract]
Environmental remediation obligations	$ 21.9	$ 23.3

Capital Stock - Additional Information (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Oct. 22, 2014	Oct. 21, 2014	Sep. 30, 2013	Sep. 30, 2012
Shareholders Equity [Line Items]
Common stock, shares authorized	224,400,000	224,400,000
Common stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	149,600,000	149,600,000
Preferred stock, par value	$ 0.01	$ 0.01
Common stock, shares issued	55,100,094	53,832,246
Preferred stock, shares outstanding	0	0
Stock repurchase program, authorized amount			$ 300,000,000	$ 200,000,000
Shares repurchased under the program	0	909,700
Value of common stock repurchased		$ (159,852,000)
Weighted average price per share		$ 175.68
Common Stock
Shareholders Equity [Line Items]
Common stock, shares issued	55,100,094	53,832,246			53,172,551	52,157,225

SEGMENTS Segment Information - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2015 Segment
Segment Reporting [Abstract]
Number of reporting segments	3

SEGMENTS Net Sales by Reportable Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
NET SALES	$ 2,707,115	$ 2,372,906	$ 1,924,400
Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
NET SALES	1,330,135	1,161,808	946,587
Operating Segments \| Airframe
Segment Reporting Information [Line Items]
NET SALES	1,280,706	1,115,594	877,174
Operating Segments \| Non-aviation
Segment Reporting Information [Line Items]
NET SALES	$ 96,274	$ 95,504	$ 100,639

SEGMENTS EBITDA Defined by Segment to Consolidated Income Before Taxes Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	$ 1,233,654	$ 1,073,207	$ 900,278
Depreciation and amortization	93,663	96,385	73,515
Interest expense, net	418,785	347,688	270,685
Stock compensation expense	31,500	26,332	48,884
REFINANCING COSTS	18,393	131,622	30,281
INCOME BEFORE INCOME TAXES	636,824	448,510	448,489
Operating Segments
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	1,260,928	1,098,226	923,663
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	653,050	585,671	493,733
Depreciation and amortization	39,336	40,401	29,789
Operating Segments \| Airframe
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Earnings before interest taxes depreciation and amortization	585,472	494,076	406,283
Depreciation and amortization	50,355	50,311	40,757
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	22,406	18,479	23,647
Depreciation and amortization	2,846	4,579	2,614
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	27,274	25,019	23,385
Depreciation and amortization	1,126	1,094	355
Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Depreciation and amortization	93,663	96,385	73,515
Interest expense, net	418,785	347,688	270,685
Acquisition-related costs	36,623	20,541	26,433
Stock compensation expense	31,500	26,332	48,884
REFINANCING COSTS	18,393	131,622	30,281
Other nonrecurring charges	$ (2,134)	$ 2,129	$ 1,991

SEGMENTS Capital Expenditures and Depreciation and Amortization by Segment (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Capital expenditures	$ 54,871	$ 34,146	$ 35,535
Depreciation and amortization	93,663	96,385	73,515
Operating Segments \| Non-aviation
Segment Reporting Information [Line Items]
Capital expenditures	1,889	3,097	2,773
Depreciation and amortization	2,846	4,579	2,614
Operating Segments \| Power & Control
Segment Reporting Information [Line Items]
Capital expenditures	24,664	13,882	15,216
Depreciation and amortization	39,336	40,401	29,789
Operating Segments \| Airframe
Segment Reporting Information [Line Items]
Capital expenditures	28,086	17,096	17,054
Depreciation and amortization	50,355	50,311	40,757
Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Capital expenditures	232	71	492
Depreciation and amortization	$ 1,126	$ 1,094	$ 355

SEGMENTS Total Assets by Segment (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 8,427,050	$ 6,756,848
Operating Segments \| Power & Control
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,550,866	2,441,286
Operating Segments \| Airframe
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	3,923,137	3,255,538
Operating Segments \| Non-aviation
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	129,935	132,988
Corporate, Non-Segment [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Total assets	$ 823,112	$ 927,036

Stock-Based Compensation - Additional Information (Detail) $ in Thousands		1 Months Ended				12 Months Ended
	Mar. 01, 2013 $ / shares	Jul. 31, 2013 $ / shares	Jun. 30, 2013 USD ($)	Nov. 30, 2012 $ / shares	Mar. 31, 2011 shares	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($) $ / shares	Sep. 30, 2013 USD ($) $ / shares shares	Sep. 30, 2012 $ / shares	Sep. 30, 2003 shares	Oct. 02, 2014 shares	Jun. 29, 2013 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-cash equity compensation \| $						$ 31,500	$ 26,332	$ 48,884
Stock based compensation expenses \| $			$ 24,500				$ 6,400
Unvested options granted \| shares												2,409,420
Weighted-average exercise price per option \| $ / shares												$ 58.35
Stock option weighted-average grant date fair value \| $ / shares						$ 65.57	$ 57.53	$ 45.53
Unrecognized compensation cost related to non-vested awards expected to vest \| $						$ 57,600
Non-vested awards expected to vest weighted-average period						2 years 26 days
Fair value of options vested \| $						$ 14,900	$ 23,600	$ 63,900
Special cash dividend paid per share (in dollars per share) \| $ / shares						$ 0	$ 25.00	$ 34.85
Restricted stock granted during the period \| shares						17,700
Restricted stock weighted-average grant date fair value \| $ / shares						$ 189.97
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number \| shares						17,700
Cash dividend and dividend equivalents paid \| $						$ 14,151	$ 17,805	$ 45,579
Options granted prior to October 1, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold price minimum for accelerated vesting \| $ / shares	147.15
Original Threshold Price Minimum For Accelerated Vesting \| $ / shares	160
Number of trading days	60 days
Options granted in fiscal 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Threshold price minimum for accelerated vesting \| $ / shares									135.15
Original Threshold Price Minimum For Accelerated Vesting \| $ / shares									170
Number of trading days									60 days
Number of years from grant date									2 years
2014 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock \| shares											5,000,000
2006 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock \| shares					8,119,668
Restricted stock grant period in years					3 years
Share issued during period \| shares						1,973
Weighted average grant date fair value, share issued \| $ / shares						$ 211.76
Shares available for award \| shares						687,944
2003 Stock Option Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of common stock \| shares								9,339,453
Restricted stock grant period in years										4 years
Shares available for award \| shares										3,870,152
Stock split, terms						TD Group (after giving effect to the 149.60 for 1.00 stock split effected on March 14, 2006)
Additional stock option granted \| shares										5,469,301
Stock option, expiry period										10 years
Total intrinsic value of options exercised \| $						$ 206,900	88,700	$ 120,800
2003 Stock Option Plan \| Employee Service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting										20.00%
2003 Stock Option Plan \| Other Than Employee Service
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of vesting										80.00%
Cash Dividends
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Special cash dividend paid per share (in dollars per share) \| $ / shares		$ 22.00		$ 12.85
Vested Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash dividend and dividend equivalents paid \| $						$ 3,400	$ 126,600	$ 171,200

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, 2015	Sep. 30, 2014	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Risk-free interest rate, minimum	1.33%	1.71%	0.84%
Risk-free interest rate, maximum	1.64%	2.03%	1.00%
Expected life of options	5 years	6 years	6 years
Expected dividend yield of stock	0.00%	0.00%	0.00%
Expected volatility of stock	35.00%	35.00%	35.00%

STOCK-BASED COMPENSATION - Summary of Activity, Pricing and Other Information for Performance Vested Stock-Based Award Activity (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2003
2006 Stock Incentive Plan
Number of Options
Number of Options, Granted	687,944
2006 Stock Incentive Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	5,328,104
Number of Options, Granted	1,183,330
Number of Options, Exercised	(1,042,166)
Number of Options, Forfeited	(203,725)
Number of Options, Expired	0
Number of Options, Outstanding, end of period	5,265,543
Number of Options, Expected to vest	1,616,548
Number of Options Exercisable at end of period	3,123,768
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period	$ 82.18
Weighted-Average Exercise Price Per Option, Granted	197.26
Weighted-Average Exercise Price Per Option, Exercised	55.71
Weighted-Average Exercise Price Per Option, Forfeited	145.77
Weighted-Average Exercise Price Per Option, Expired	0.00
Weighted-Average Exercise Price Per Option, Outstanding, end of period	110.82
Weighted-Average Exercise Price Per Option, Expected to vest	138.95
Weighted-Average Exercise Price Per Option, Exercisable	$ 72.38
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	6 years 3 months 18 days
Weighted-Average Remaining Contractual Term, Expected to vest, years	7 years 10 months 6 days
Weighted-Average Remaining Contractual Term, Exercisable, years	4 years 10 months 24 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding	$ 534,926,513
Aggregate Intrinsic Value, Expected to vest	118,757,272
Aggregate Intrinsic Value, Exercisable	$ 437,421,233
2003 Stock Option Plan
Number of Options
Number of Options, Granted		3,870,152
2003 Stock Option Plan \| Performance Vested Stock Options
Number of Options
Number of Options, Outstanding, beginning of period	284,268
Number of Options, Granted	0
Number of Options, Exercised	(171,252)
Number of Options, Outstanding, end of period	113,016
Number of Options Exercisable at end of period	35,187
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period	$ 48.48
Weighted-Average Exercise Price Per Option, Granted	0.00
Weighted-Average Exercise Price Per Option, Exercised	15.72
Weighted-Average Exercise Price Per Option, Outstanding, end of period	98.11
Weighted-Average Exercise Price Per Option, Exercisable	$ 27.38
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	5 years 3 months
Weighted-Average Remaining Contractual Term, Exercisable, years	1 year 29 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding	$ 12,917,729
Aggregate Intrinsic Value, Exercisable	$ 6,510,651

STOCK-BASED COMPENSATION - Summary of Activity, Pricing and Other Information for Time Vested Stock Based Award Activity (Detail) - 2003 Stock Option Plan - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2003
Number of shares
Number of Options, Granted		3,870,152
Time Vested Stock Options
Number of shares
Number of Options, Outstanding, beginning of period	40,243
Number of Options, Granted	0
Number of Options, Exercised	(34,757)
Number of Options, Forfeited	0
Number of Options, Outstanding, end of period	5,486
Number of Options Exercisable at end of period	5,486
Weighted average exercise price per option
Weighted-Average Exercise Price Per Option, Outstanding, beginning of period	$ 28.24
Weighted-Average Exercise Price Per Option, Granted	0.00
Weighted-Average Exercise Price Per Option, Exercised	26.40
Weighted-Average Exercise Price Per Option, Forfeited	0.00
Weighted-Average Exercise Price Per Option, Outstanding, end of period	39.88
Weighted-Average Exercise Price Per Option, Exercisable	$ 39.88
Weighted average remaining contractual term
Weighted-Average Remaining Contractual Term, Outstanding, years	1 year 9 months 22 days
Weighted-Average Remaining Contractual Term, Exercisable, years	1 year 9 months 22 days
Aggregate intrinsic value
Aggregate Intrinsic Value, Outstanding	$ 946,499
Aggregate Intrinsic Value, Exercisable	$ 946,499

LEASES - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Leases [Abstract]
Annual rental expense	$ 14.0	$ 12.1	$ 9.2
Future minimum rental commitments due next twelve months	13.3
Future minimum rental commitments due in two years	11.6
Future minimum rental commitments due in three years	9.5
Future minimum rental commitments due in four years	7.0
Future minimum rental commitments due in five years	6.1
Future minimum rental commitments, due thereafter	$ 20.3

FAIR VALUE MEASUREMENTS Carrying Amounts and Fair Values of Financial Instruments (Detail) - USD ($)
$ in Thousands

12 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2012

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Cash and cash equivalents, Assets, Carrying Amount

$ 714,033

$ 819,548

$ 564,740

$ 440,524

Short-term borrowings - trade receivable securitization facility, Carrying Amount

200,000

Other Noncurrent Assets

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Interest Rate Swap Asset Carrying Amount

^[1]

8,180

Interest Rate Cash Flow Hedge Asset at Fair Value

^[1]

8,180

Accrued Liabilities

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Interest rate swap agreements, Liabilities, Carrying Amount

^[2]

24,770

20,070

Other Non-Current Liabilities

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Interest rate swap agreements, Liabilities, Carrying Amount

^[3]

49,730

4,650

Term Loans

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Carrying Amount

4,377,342

3,873,131

5.50% Senior Subordinated Notes, Due 2020

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Carrying Amount

$ 550,000

Senior subordinate note, due date

2020

7.50% Senior Subordinated Notes, Due 2021

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Carrying Amount

$ 500,000

Senior subordinate note, due date

2021

6.00% Senior Subordinated Notes, Due 2022

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Carrying Amount

$ 1,150,000

Senior subordinate note, due date

2022

6.50% Senior Subordinated Notes, Due 2024

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Carrying Amount

$ 1,200,000

Senior subordinate note, due date

2024

6.50% Senior Subordinated Notes, Due 2025

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Carrying Amount

$ 450,000

$ 0

Senior subordinate note, due date

2025

Level 1

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Cash and cash equivalents, Assets, Fair Value

$ 714,033

819,548

Short-term borrowings - trade receivable securitization facility, Fair Value

200,000

Level 1 | 5.50% Senior Subordinated Notes, Due 2020

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Fair Value

520,000

529,000

Level 1 | 7.50% Senior Subordinated Notes, Due 2021

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Fair Value

524,000

531,000

Level 1 | 6.00% Senior Subordinated Notes, Due 2022

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Fair Value

1,081,000

1,121,000

Level 1 | 6.50% Senior Subordinated Notes, Due 2024

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Fair Value

1,119,000

1,182,000

Level 1 | 6.50% Senior Subordinated Notes, Due 2025

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Fair Value

417,000

Level 2 | Accrued Liabilities

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Interest Rate Cash Flow Hedge Liability at Fair Value

^[2]

24,770

20,070

Level 2 | Other Non-Current Liabilities

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Interest Rate Cash Flow Hedge Liability at Fair Value

^[3]

49,730

4,650

Level 2 | Term Loans

Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]

Long-term debt, Fair Value

$ 4,344,000

$ 3,821,000

[1]	Included in Other non-current assets on the Condensed Consolidated Balance Sheet.
[2]	Included in Accrued liabilities on the Condensed Consolidated Balance Sheet.
[3]	Included in Other non-current liabilities on the Condensed Consolidated Balance Sheet.

DERIVATIVES AND HEDGING ACTIVITIES Derivatives and Hedging Activities - Additional Information (Detail)	12 Months Ended
	Sep. 30, 2015 USD ($) agreements	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Jun. 26, 2015 USD ($)
Derivative [Line Items]
Deficit amortized into earnings	$ 3,200,000	$ 4,200,000	$ 2,500,000
Derivative loss to be recognized	$ 24,800,000
2013 Credit Facility
Derivative [Line Items]
Interest rate swap, notional amount				$ 353,000,000
Fixed rate of interest under interest rate swap				5.17%
Variable rate	3.00%			3.00%
Margin percent	2.20%			2.20%
Interest rate swap agreements description	2.2% plus the 3% margin percentage
Forward-starting interest rate swap agreements beginning March 31, 2016
Derivative [Line Items]
Number of interestrate swap agreements \| agreements	5
Interest rate swap, notional amount	$ 750,000,000
Fixed rate of interest under interest rate swap	5.80%
Variable rate	3.00%
Margin percent	2.80%
Interest rate swap agreements description	2.8% plus the 3% margin percentage
Interest rate swap agreements beginning September 30, 2014
Derivative [Line Items]
Number of interestrate swap agreements \| agreements	3
Interest rate swap, notional amount	$ 1,000,000,000
Fixed rate of interest under interest rate swap	5.40%
Variable rate	3.00%
Margin percent	2.40%
Interest rate swap agreements description	2.4% plus the 3% margin percentage
Interest rate swap agreements to swap variable rates on the credit facility for a fixed rate
Derivative [Line Items]
Number of interestrate swap agreements \| agreements	3
Interest Rate Cap
Derivative [Line Items]
Number of interestrate swap agreements \| agreements	6
Interest rate swap, notional amount	$ 750,000,000
Fixed rate of interest under interest rate swap	2.50%

ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands

12 Months Ended

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]

Balance at beginning of period

$ (25,171)

$ (6,516)

Other comprehensive loss before reclassification

(73,988)

(22,855)

Amounts reclassified from AOCI related to interest rate swap agreements

^[1]

3,150

4,200

Interest rate swaps and caps, net of tax

(35,604)

(6,166)

$ (3,587)

Pension liability adjustments, net of tax

(5,786)

(4,836)

1,005

Foreign currency translation adjustments

(29,448)

(7,653)

4,117

Other comprehensive (loss) income, net of tax

(70,838)

(18,655)

1,535

Balance at end of period

(96,009)

(25,171)

(6,516)

Unrealized (loss) gain on derivatives designated and qualifying as cash flow hedges

Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]

Balance at beginning of period

(15,888)

(9,722)

Other comprehensive loss before reclassification

(38,754)

(10,366)

Amounts reclassified from AOCI related to interest rate swap agreements

^[1]

3,150

4,200

Interest rate swaps and caps, net of tax

(35,604)

(6,166)

Balance at end of period

(51,492)

(15,888)

(9,722)

Defined benefit pension plan activity

Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]

Balance at beginning of period

(6,227)

(1,391)

Other comprehensive loss before reclassification

(5,786)

(4,836)

Amounts reclassified from AOCI related to interest rate swap agreements

^[1]

Pension liability adjustments, net of tax

(5,786)

(4,836)

Balance at end of period

(12,013)

(6,227)

(1,391)

Currency translation adjustment

Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]

Balance at beginning of period

(3,056)

4,597

Other comprehensive loss before reclassification

(29,448)

(7,653)

Amounts reclassified from AOCI related to interest rate swap agreements

^[1]

Foreign currency translation adjustments

(29,448)

(7,653)

Balance at end of period

$ (32,504)

$ (3,056)

$ 4,597

[1]	This component of AOCI is included in interest expense (see Note 20, "Derivatives and Hedging Activities," for additional details).

QUARTERLY FINANCIAL DATA (UNAUDTIED) Quarterly Financial Data (Unaudited) (Detail) - USD ($)
$ / shares in Units, $ in Thousands

3 Months Ended

12 Months Ended

Sep. 30, 2015

Jun. 26, 2015

Mar. 28, 2015

Dec. 27, 2014

Sep. 30, 2014

Jun. 28, 2014

Mar. 29, 2014

Dec. 28, 2013

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Quarterly Financial Data [Line Items]

NET SALES

$ 2,707,115

$ 2,372,906

$ 1,924,400

GROSS PROFIT

1,449,845

1,267,874

1,049,562

Net income

$ 447,212

$ 306,910

$ 302,789

Net earnings (loss) per share - basic and diluted (in dollars per share)

$ 7.84

$ 3.16

$ 2.39

TransDigm Group

Quarterly Financial Data [Line Items]

NET SALES

$ 809,792

^[1]

$ 691,395

^[1]

$ 619,030

^[1]

$ 586,898

^[1]

$ 642,241

^[1]

$ 610,582

^[1]

$ 590,761

^[1]

$ 529,322

^[1]

$ 0

GROSS PROFIT

427,600

^[1]

359,455

^[1]

341,617

^[1]

321,173

^[1]

348,628

^[1]

327,528

^[1]

307,582

^[1]

284,136

^[1]

Net income

$ 141,673

^[1]

$ 99,112

^[1]

$ 110,894

^[1]

$ 95,533

^[1]

$ 114,255

^[1]

$ 16,177

^[1]

$ 90,355

^[1]

$ 86,123

^[1]

$ 447,212

$ 306,910

$ 302,789

Net earnings (loss) per share - basic and diluted (in dollars per share)

$ 2.50

$ 1.75

^[2]

$ 1.96

^[2]

$ 1.63

^[2]

$ 1.91

^[2]

$ (1.66)

^[2]

$ 1.49

^[2]

$ 1.44

^[2]

[1]	The Company’s operating results include the results of operations of acquisitions from the effective date of each acquisition. See Note 2 to the Consolidated Financial Statements.
[2]	The sum of the earnings per share for the four quarters in a year does not necessarily equal the total year earnings per share.

- Definition

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

+ References + Details

SUPPLEMENTAL GUARANTOR INFORMATION Supplemental Condensed Consolidating Balance Sheet (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 714,033	$ 819,548	$ 564,740	$ 440,524
Trade accounts receivable—Net	444,072	351,307
Inventories—Net	591,401	459,074
Deferred income taxes	45,375	37,669
Prepaid expenses and other	37,081	21,978
Total current assets	1,831,962	1,689,576
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	0	0
PROPERTY, PLANT AND EQUIPMENT—Net	260,684	212,108
GOODWILL	4,686,220	3,525,077	3,343,907
OTHER INTANGIBLE ASSETS—Net	1,539,851	1,217,153
OTHER	108,333	112,934
TOTAL ASSETS	8,427,050	6,756,848
Current portion of long-term debt	43,840	39,295
Short-term borrowings—trade receivable securitization facility	200,000	200,000
Accounts payable	142,822	115,741
Accrued liabilities	271,553	230,871
Total current liabilities	658,215	585,907
LONG-TERM DEBT	8,183,502	7,233,836
DEFERRED INCOME TAXES	450,372	402,247
OTHER NON-CURRENT LIABILITIES	173,267	90,957
Total liabilities	9,465,356	8,312,947
Total stockholders’ deficit	(1,038,306)	(1,556,099)	(336,381)	1,218,834
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	8,427,050	6,756,848
TransDigm Group
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	1,500	2,088	1,313	20,100
Trade accounts receivable—Net	0	0
Inventories—Net	0	0
Deferred income taxes	0	0
Prepaid expenses and other	0	0
Total current assets	1,500	2,088
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	(1,039,806)	(1,558,187)
PROPERTY, PLANT AND EQUIPMENT—Net	0	0
GOODWILL	0	0
OTHER INTANGIBLE ASSETS—Net	0	0
OTHER	0	0
TOTAL ASSETS	(1,038,306)	(1,556,099)
Current portion of long-term debt	0	0
Short-term borrowings—trade receivable securitization facility	0	0
Accounts payable	0	0
Accrued liabilities	0	0
Total current liabilities	0	0
LONG-TERM DEBT	0	0
DEFERRED INCOME TAXES	0	0
OTHER NON-CURRENT LIABILITIES	0	0
Total liabilities	0	0
Total stockholders’ deficit	(1,038,306)	(1,556,099)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	(1,038,306)	(1,556,099)
TransDigm Inc.
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	659,365	782,648	536,863	406,891
Trade accounts receivable—Net	(265)	(305)
Inventories—Net	34,457	32,287
Deferred income taxes	44,677	37,669
Prepaid expenses and other	2,804	2,040
Total current assets	741,038	854,339
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	6,963,034	5,327,465
PROPERTY, PLANT AND EQUIPMENT—Net	16,565	15,884
GOODWILL	65,886	64,461
OTHER INTANGIBLE ASSETS—Net	38,621	40,066
OTHER	91,244	100,000
TOTAL ASSETS	7,916,388	6,402,215
Current portion of long-term debt	43,840	39,295
Short-term borrowings—trade receivable securitization facility	0	0
Accounts payable	16,561	17,629
Accrued liabilities	97,045	106,631
Total current liabilities	157,446	163,555
LONG-TERM DEBT	8,183,502	7,233,836
DEFERRED INCOME TAXES	379,525	402,538
OTHER NON-CURRENT LIABILITIES	99,743	42,470
Total liabilities	8,820,216	7,842,399
Total stockholders’ deficit	(903,828)	(1,440,184)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	7,916,388	6,402,215
Subsidiary Guarantors
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	7,911	3,793	7,900	4,494
Trade accounts receivable—Net	48,369	1,711
Inventories—Net	461,103	382,016
Deferred income taxes	0	0
Prepaid expenses and other	15,096	14,789
Total current assets	532,479	402,309
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	4,501,501	3,758,085
PROPERTY, PLANT AND EQUIPMENT—Net	201,499	167,257
GOODWILL	3,984,199	3,289,295
OTHER INTANGIBLE ASSETS—Net	1,236,376	1,092,011
OTHER	14,528	11,754
TOTAL ASSETS	10,470,582	8,720,711
Current portion of long-term debt	0	0
Short-term borrowings—trade receivable securitization facility	0	0
Accounts payable	102,968	85,328
Accrued liabilities	117,243	98,308
Total current liabilities	220,211	183,636
LONG-TERM DEBT	0	0
DEFERRED INCOME TAXES	2,410	0
OTHER NON-CURRENT LIABILITIES	35,222	42,445
Total liabilities	257,843	226,081
Total stockholders’ deficit	10,212,739	8,494,630
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	10,470,582	8,720,711
Non-Guarantor Subsidiaries
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	45,257	31,019	18,664	9,039
Trade accounts receivable—Net	413,380	351,881
Inventories—Net	96,541	45,471
Deferred income taxes	698	0
Prepaid expenses and other	19,181	5,149
Total current assets	575,057	433,520
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	(33,208)	(59,788)
PROPERTY, PLANT AND EQUIPMENT—Net	42,620	28,967
GOODWILL	636,135	171,321
OTHER INTANGIBLE ASSETS—Net	266,315	86,536
OTHER	2,561	1,180
TOTAL ASSETS	1,489,480	661,736
Current portion of long-term debt	0	0
Short-term borrowings—trade receivable securitization facility	200,000	200,000
Accounts payable	37,556	14,768
Accrued liabilities	57,265	25,932
Total current liabilities	294,821	240,700
LONG-TERM DEBT	0	0
DEFERRED INCOME TAXES	68,437	(291)
OTHER NON-CURRENT LIABILITIES	38,302	6,042
Total liabilities	401,560	246,451
Total stockholders’ deficit	1,087,920	415,285
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	1,489,480	661,736
Eliminations
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	0	$ 0	$ 0
Trade accounts receivable—Net	(17,412)	(1,980)
Inventories—Net	(700)	(700)
Deferred income taxes	0	0
Prepaid expenses and other	0	0
Total current assets	(18,112)	(2,680)
INVESTMENT IN SUBSIDIARIES AND INTERCOMPANY BALANCES	(10,391,521)	(7,467,575)
PROPERTY, PLANT AND EQUIPMENT—Net	0	0
GOODWILL	0	0
OTHER INTANGIBLE ASSETS—Net	(1,461)	(1,460)
OTHER	0	0
TOTAL ASSETS	(10,411,094)	(7,471,715)
Current portion of long-term debt	0	0
Short-term borrowings—trade receivable securitization facility	0	0
Accounts payable	(14,263)	(1,984)
Accrued liabilities	0	0
Total current liabilities	(14,263)	(1,984)
LONG-TERM DEBT	0	0
DEFERRED INCOME TAXES	0	0
OTHER NON-CURRENT LIABILITIES	0	0
Total liabilities	(14,263)	(1,984)
Total stockholders’ deficit	(10,396,831)	(7,469,731)
TOTAL LIABILITIES AND STOCKHOLDERS’ DEFICIT	$ (10,411,094)	$ (7,471,715)

SUPPLEMENTAL GUARANTOR INFORMATION Supplemental Condensed Consolidating Statement of Income and Comprehensive Income (Detail) - USD ($)
$ in Thousands

3 Months Ended

12 Months Ended

Sep. 30, 2015

^[1]

Jun. 26, 2015

^[1]

Mar. 28, 2015

^[1]

Dec. 27, 2014

^[1]

Sep. 30, 2014

^[1]

Jun. 28, 2014

^[1]

Mar. 29, 2014

^[1]

Dec. 28, 2013

^[1]

Sep. 30, 2015

Sep. 30, 2014

Sep. 30, 2013

Condensed Income Statements, Captions [Line Items]

NET SALES

$ 2,707,115

$ 2,372,906

$ 1,924,400

COST OF SALES

1,257,270

1,105,032

874,838

GROSS PROFIT

1,449,845

1,267,874

1,049,562

SELLING AND ADMINISTRATIVE EXPENSES

321,624

276,446

254,468

AMORTIZATION OF INTANGIBLE ASSETS

54,219

63,608

45,639

INCOME FROM OPERATIONS

1,074,002

927,820

749,455

INTEREST EXPENSE—Net

418,785

347,688

270,685

REFINANCING COSTS

18,393

131,622

30,281

EQUITY IN INCOME OF SUBSIDIARIES

INCOME BEFORE INCOME TAXES

636,824

448,510

448,489

INCOME TAX PROVISION (BENEFIT)

189,612

141,600

145,700

NET INCOME

447,212

306,910

302,789

Statement of Comprehensive Income [Abstract]

Other comprehensive (loss) income, net of tax

(70,838)

(18,655)

1,535

TOTAL COMPREHENSIVE INCOME (LOSS)

376,374

288,255

304,324

TransDigm Group

Condensed Income Statements, Captions [Line Items]

NET SALES

$ 809,792

$ 691,395

$ 619,030

$ 586,898

$ 642,241

$ 610,582

$ 590,761

$ 529,322

COST OF SALES

GROSS PROFIT

427,600

359,455

341,617

321,173

348,628

327,528

307,582

284,136

SELLING AND ADMINISTRATIVE EXPENSES

AMORTIZATION OF INTANGIBLE ASSETS

INCOME FROM OPERATIONS

INTEREST EXPENSE—Net

REFINANCING COSTS

EQUITY IN INCOME OF SUBSIDIARIES

(447,212)

(306,910)

(302,789)

INCOME BEFORE INCOME TAXES

447,212

306,910

302,789

INCOME TAX PROVISION (BENEFIT)

NET INCOME

$ 141,673

$ 99,112

$ 110,894

$ 95,533

$ 114,255

$ 16,177

$ 90,355

$ 86,123

447,212

306,910

302,789

Statement of Comprehensive Income [Abstract]

Other comprehensive (loss) income, net of tax

(70,838)

(18,655)

1,535

TOTAL COMPREHENSIVE INCOME (LOSS)

376,374

288,255

304,324

TransDigm Inc.

Condensed Income Statements, Captions [Line Items]

NET SALES

131,378

125,389

110,608

COST OF SALES

79,174

74,312

66,524

GROSS PROFIT

52,204

51,077

44,084

SELLING AND ADMINISTRATIVE EXPENSES

72,792

65,272

88,286

AMORTIZATION OF INTANGIBLE ASSETS

1,392

1,388

624

INCOME FROM OPERATIONS

(21,980)

(15,583)

(44,826)

INTEREST EXPENSE—Net

430,224

349,289

267,385

REFINANCING COSTS

18,393

131,622

30,281

EQUITY IN INCOME OF SUBSIDIARIES

(773,510)

(639,539)

(505,199)

INCOME BEFORE INCOME TAXES

302,913

143,045

162,707

INCOME TAX PROVISION (BENEFIT)

(144,299)

(163,865)

(140,082)

NET INCOME

447,212

306,910

302,789

Statement of Comprehensive Income [Abstract]

Other comprehensive (loss) income, net of tax

(55,338)

(3,951)

(4,515)

TOTAL COMPREHENSIVE INCOME (LOSS)

391,874

302,959

298,274

Subsidiary Guarantors

Condensed Income Statements, Captions [Line Items]

NET SALES

2,262,842

2,051,541

1,699,742

COST OF SALES

973,908

895,041

732,812

GROSS PROFIT

1,288,934

1,156,500

966,930

SELLING AND ADMINISTRATIVE EXPENSES

197,914

176,516

147,620

AMORTIZATION OF INTANGIBLE ASSETS

45,337

55,730

43,265

INCOME FROM OPERATIONS

1,045,683

924,254

776,045

INTEREST EXPENSE—Net

(487)

(36)

2,028

REFINANCING COSTS

EQUITY IN INCOME OF SUBSIDIARIES

INCOME BEFORE INCOME TAXES

1,046,170

924,290

774,017

INCOME TAX PROVISION (BENEFIT)

315,017

293,961

272,829

NET INCOME

731,153

630,329

501,188

Statement of Comprehensive Income [Abstract]

Other comprehensive (loss) income, net of tax

770

(1,520)

950

TOTAL COMPREHENSIVE INCOME (LOSS)

731,923

628,809

502,138

Non-Guarantor Subsidiaries

Condensed Income Statements, Captions [Line Items]

NET SALES

324,675

206,952

120,706

COST OF SALES

215,968

146,878

81,583

GROSS PROFIT

108,707

60,074

39,123

SELLING AND ADMINISTRATIVE EXPENSES

50,918

34,658

17,180

AMORTIZATION OF INTANGIBLE ASSETS

7,490

6,490

1,750

INCOME FROM OPERATIONS

50,299

18,926

20,193

INTEREST EXPENSE—Net

(10,952)

(1,565)

1,272

REFINANCING COSTS

EQUITY IN INCOME OF SUBSIDIARIES

INCOME BEFORE INCOME TAXES

61,251

20,491

18,921

INCOME TAX PROVISION (BENEFIT)

18,894

11,504

12,953

NET INCOME

42,357

8,987

5,968

Statement of Comprehensive Income [Abstract]

Other comprehensive (loss) income, net of tax

(29,147)

(13,184)

5,100

TOTAL COMPREHENSIVE INCOME (LOSS)

13,210

(4,197)

11,068

Eliminations

Condensed Income Statements, Captions [Line Items]

NET SALES

(11,780)

(10,976)

(6,656)

COST OF SALES

(11,780)

(11,199)

(6,081)

GROSS PROFIT

223

(575)

SELLING AND ADMINISTRATIVE EXPENSES

1,382

AMORTIZATION OF INTANGIBLE ASSETS

INCOME FROM OPERATIONS

223

(1,957)

INTEREST EXPENSE—Net

REFINANCING COSTS

EQUITY IN INCOME OF SUBSIDIARIES

1,220,722

946,449

807,988

INCOME BEFORE INCOME TAXES

(1,220,722)

(946,226)

(809,945)

INCOME TAX PROVISION (BENEFIT)

NET INCOME

(1,220,722)

(946,226)

(809,945)

Statement of Comprehensive Income [Abstract]

Other comprehensive (loss) income, net of tax

83,715

18,655

(1,535)

TOTAL COMPREHENSIVE INCOME (LOSS)

$ (1,137,007)

$ (927,571)

$ (811,480)

[1]	The Company’s operating results include the results of operations of acquisitions from the effective date of each acquisition. See Note 2 to the Consolidated Financial Statements.

SUPPLEMENTAL GUARANTOR INFORMATION Supplemental Condensed Consolidating Statement of Cash Flows (Detail) - USD ($) $ in Thousands		12 Months Ended
	Mar. 26, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities		$ 520,938	$ 541,222	$ 470,205
Capital expenditures, net of disposals		(54,871)	(34,146)	(35,535)
Acquisition of business, net of cash acquired		(1,624,278)	(311,872)	(483,257)
Cash proceeds from sale of real estate		0	16,380	0
Cash proceeds from sale of investment		0	0	16,350
Net cash used in investing activities		(1,679,149)	(329,638)	(502,442)
Intercompany activities		0	0	0
Excess tax benefits related to share-based payment arrangements		61,965	51,709	66,201
Proceeds from exercise of stock options		61,674	26,738	21,534
Dividends paid		(3,365)	(1,451,391)	(1,991,350)
Treasury stock purchased		0	(159,852)	0
Proceeds from credit facility-net		10,281	805,360	3,211,374
Repayment on credit facility		(1,017,988)	(33,107)	(2,187,885)
Proceeds from senior subordinated notes-net		0	2,326,393	1,036,321
Proceeds from trade receivable securitization facility, net		0	199,164	0
Other		(1,266)	(27)	0
Net cash provided by financing activities		1,054,947	43,973	156,195
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS		(2,251)	(749)	258
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		(105,515)	254,808	124,216
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		819,548	564,740	440,524
CASH AND CASH EQUIVALENTS, END OF PERIOD		714,033	819,548	564,740
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities		3,154	15,204	(8,593)
Capital expenditures, net of disposals		0	0	0
Acquisition of business, net of cash acquired		0	0	0
Cash proceeds from sale of real estate			0
Cash proceeds from sale of investment				0
Net cash used in investing activities		0	0	0
Intercompany activities		(3,154)	(15,204)	8,593
Excess tax benefits related to share-based payment arrangements		0	0	0
Proceeds from exercise of stock options		0	0	0
Dividends paid		0	0	0
Treasury stock purchased			0
Proceeds from credit facility-net		0	0	0
Repayment on credit facility		0	0	0
Proceeds from senior subordinated notes-net			0	0
Proceeds from trade receivable securitization facility, net			0
Other		0	0
Net cash provided by financing activities		(3,154)	(15,204)	8,593
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS		0	0	0
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		0	0	0
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		0	0	0
CASH AND CASH EQUIVALENTS, END OF PERIOD		0	0	0
TransDigm Group
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities		0	0	0
Capital expenditures, net of disposals		0	0	0
Acquisition of business, net of cash acquired		0	0
Cash proceeds from sale of real estate			0
Cash proceeds from sale of investment				0
Net cash used in investing activities		0	0	0
Intercompany activities		(120,862)	1,533,571	1,884,828
Excess tax benefits related to share-based payment arrangements		61,965	51,709	66,201
Proceeds from exercise of stock options		61,674	26,738	21,534
Dividends paid		(3,365)	(1,451,391)	(1,991,350)
Treasury stock purchased			(159,852)
Proceeds from credit facility-net		0	0	0
Repayment on credit facility		0	0	0
Proceeds from senior subordinated notes-net			0	0
Proceeds from trade receivable securitization facility, net			0
Other		0	0
Net cash provided by financing activities		(588)	775	(18,787)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS		0	0	0
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		(588)	775	(18,787)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		2,088	1,313	20,100
CASH AND CASH EQUIVALENTS, END OF PERIOD		1,500	2,088	1,313
TransDigm Inc.
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities		(298,797)	(123,074)	(95,862)
Capital expenditures, net of disposals		(2,871)	(2,666)	(2,047)
Acquisition of business, net of cash acquired		(1,624,278)	(311,872)	(483,257)
Cash proceeds from sale of real estate			0
Cash proceeds from sale of investment				16,350
Net cash used in investing activities		(1,627,149)	(314,538)	(468,954)
Intercompany activities		867,990	(694,208)	(1,365,022)
Excess tax benefits related to share-based payment arrangements		0	0	0
Proceeds from exercise of stock options		0	0	0
Dividends paid		0	0	0
Treasury stock purchased			0
Proceeds from credit facility-net		10,281	805,360	3,211,374
Repayment on credit facility		(1,017,988)	(33,107)	(2,187,885)
Proceeds from senior subordinated notes-net			2,326,393	1,036,321
Proceeds from trade receivable securitization facility, net			0
Other		(1,266)	(27)
Net cash provided by financing activities		1,802,663	683,397	694,788
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS		0	0	0
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		(123,283)	245,785	129,972
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		782,648	536,863	406,891
CASH AND CASH EQUIVALENTS, END OF PERIOD		659,365	782,648	536,863
Subsidiary Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities		734,130	952,855	565,957
Capital expenditures, net of disposals		(44,564)	(28,927)	(29,727)
Acquisition of business, net of cash acquired		0	0	0
Cash proceeds from sale of real estate			16,380
Cash proceeds from sale of investment				0
Net cash used in investing activities		(44,564)	(12,547)	(29,727)
Intercompany activities		(685,448)	(944,415)	(532,824)
Excess tax benefits related to share-based payment arrangements		0	0	0
Proceeds from exercise of stock options		0	0	0
Dividends paid		0	0	0
Treasury stock purchased			0
Proceeds from credit facility-net		0	0	0
Repayment on credit facility		0	0	0
Proceeds from senior subordinated notes-net			0	0
Proceeds from trade receivable securitization facility, net			0
Other		0	0
Net cash provided by financing activities		(685,448)	(944,415)	(532,824)
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS		0	0	0
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		4,118	(4,107)	3,406
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		3,793	7,900	4,494
CASH AND CASH EQUIVALENTS, END OF PERIOD		7,911	3,793	7,900
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash provided by operating activities		82,451	(303,763)	8,703
Capital expenditures, net of disposals		(7,436)	(2,553)	(3,761)
Acquisition of business, net of cash acquired		0	0	0
Cash proceeds from sale of real estate			0
Cash proceeds from sale of investment				0
Net cash used in investing activities		(7,436)	(2,553)	(3,761)
Intercompany activities		(58,526)	120,256	4,425
Excess tax benefits related to share-based payment arrangements		0	0	0
Proceeds from exercise of stock options		0	0	0
Dividends paid		0	0	0
Treasury stock purchased			0
Proceeds from credit facility-net		0	0	0
Repayment on credit facility		0	0	0
Proceeds from senior subordinated notes-net			0	0
Proceeds from trade receivable securitization facility, net			199,164
Other		0	0
Net cash provided by financing activities		(58,526)	319,420	4,425
EFFECT OF EXCHANGE RATE CHANGES ON CASH AND CASH EQUIVALENTS		(2,251)	(749)	258
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS		14,238	12,355	9,625
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD		31,019	18,664	9,039
CASH AND CASH EQUIVALENTS, END OF PERIOD		45,257	31,019	18,664
2015 Term Loans
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		1,505,673	0	0
Repayment on credit facility		(7,330)	0	0
2015 Term Loans \| Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
2015 Term Loans \| TransDigm Group
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
2015 Term Loans \| TransDigm Inc.
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		1,505,673
Repayment on credit facility		(7,330)
2015 Term Loans \| Subsidiary Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
2015 Term Loans \| Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
Revolving Commitment
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net	$ 75,300	75,250	0	0
Repayment on credit facility		(75,250)	0	0
Revolving Commitment \| Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
Revolving Commitment \| TransDigm Group
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
Revolving Commitment \| TransDigm Inc.
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		75,250
Repayment on credit facility		(75,250)
Revolving Commitment \| Subsidiary Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
Revolving Commitment \| Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from credit facility-net		0
Repayment on credit facility		0
6.50% Senior Subordinated Notes, Due 2025
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from senior subordinated notes-net		445,303	0	0
6.50% Senior Subordinated Notes, Due 2025 \| Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from senior subordinated notes-net		0
6.50% Senior Subordinated Notes, Due 2025 \| TransDigm Group
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from senior subordinated notes-net		0
6.50% Senior Subordinated Notes, Due 2025 \| TransDigm Inc.
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from senior subordinated notes-net		445,303
6.50% Senior Subordinated Notes, Due 2025 \| Subsidiary Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from senior subordinated notes-net		0
6.50% Senior Subordinated Notes, Due 2025 \| Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from senior subordinated notes-net		0
7.75% Senior Subordinated Notes, Due 2018
Condensed Cash Flow Statements, Captions [Line Items]
Repurchase of 2018 Notes			(1,721,014)	$ 0
7.75% Senior Subordinated Notes, Due 2018 \| Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Repurchase of 2018 Notes			0
7.75% Senior Subordinated Notes, Due 2018 \| TransDigm Group
Condensed Cash Flow Statements, Captions [Line Items]
Repurchase of 2018 Notes			0
7.75% Senior Subordinated Notes, Due 2018 \| TransDigm Inc.
Condensed Cash Flow Statements, Captions [Line Items]
Repurchase of 2018 Notes			(1,721,014)
7.75% Senior Subordinated Notes, Due 2018 \| Subsidiary Guarantors
Condensed Cash Flow Statements, Captions [Line Items]
Repurchase of 2018 Notes			0
7.75% Senior Subordinated Notes, Due 2018 \| Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Repurchase of 2018 Notes			$ 0