| Cover Page | May 26, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | May 26, 2021 |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 1-35701 |
| Entity Tax Identification Number | 72-1455213 |
| Entity Registrant Name | Bristow Group Inc. |
| Entity Address, Address Line One | 3151 Briarpark Drive, Suite 700, |
| Entity Address, City or Town | Houston, |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77042 |
| City Area Code | (713) |
| Local Phone Number | 267-7600 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock |
| Trading Symbol | VTOL |
| Security Exchange Name | NYSE |
| Amendment Flag | false |
| Entity Central Index Key | 0001525221 |
