| Cover Page Cover Page | Jan. 14, 2021 |
| Cover [Abstract] | |
| Entity Address, Address Line One | 1301 East 9th Street, |
| Entity Address, Address Line Two | Suite 3000, |
| Entity Address, City or Town | Cleveland, |
| Entity Address, State or Province | OH |
| Document Type | 8-K |
| Document Period End Date | Jan. 14, 2021 |
| Entity Registrant Name | TransDigm Group Incorporated |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-32833 |
| Entity Tax Identification Number | 41-2101738 |
| Entity Address, Postal Zip Code | 44114 |
| City Area Code | 216 |
| Local Phone Number | 706-2960 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, $0.01 par value |
| Trading Symbol | TDG |
| Security Exchange Name | NYSE |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0001260221 |
| Amendment Flag | false |
