v2.4.0.6
Document and Entity Information (USD $)
12 Months Ended
Sep. 30, 2010
Apr. 03, 2010
Oct. 29, 2009
Document and Entity Information      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Sep. 30, 2010    
Document Fiscal Year Focus 2010    
Document Fiscal Period Focus FY    
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     49,448,405
Entity Public Float   $ 2,616,470,118  
Entity Current Reporting Status Yes    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No