| Cover Page Document | Sep. 09, 2019 |
| Cover page. [Abstract] | |
| Document Type | 8-K |
| Entity Address, Address Line One | 899 Cassatt Road, |
| Entity Incorporation, State or Country Code | DE |
| Amendment Flag | false |
| Entity Central Index Key | 0001021162 |
| Entity Registrant Name | TRIUMPH GROUP INC |
| Entity File Number | 1-12235 |
| Entity Tax Identification Number | 51-0347963 |
| Entity Address, Address Line Two | Suite 210, |
| Entity Address, City or Town | Berwyn, |
| Entity Address, State or Province | PA |
| Entity Address, Postal Zip Code | 19312 |
| Document Period End Date | Sep. 9, 2019 |
| City Area Code | 610 |
| Local Phone Number | 251-1000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
