v2.4.0.6
Document And Entity Information (USD $)
12 Months Ended
Sep. 30, 2011
Oct. 28, 2011
Apr. 02, 2011
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2011    
Document Fiscal Year Focus 2011    
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 Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   50,344,439  
Entity Public Float     $ 4,234,949,579
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer Yes