| Cover | Jun. 30, 2023 |
| Document Information [Line Items] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 30, 2023 |
| Entity File Number | 1-6311 |
| Entity Registrant Name | Tidewater Inc. |
| Entity Central Index Key | 0000098222 |
| Entity Tax Identification Number | 72-0487776 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 842 West Sam Houston Parkway North |
| Entity Address, Address Line Two | Suite 400 |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77024 |
| City Area Code | 713 |
| Local Phone Number | 470-5300 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Common Stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Common stock, $0.001 par value per share |
| Trading Symbol | TDW |
| Security Exchange Name | NYSE |
| Series A Warrants to purchase shares of common stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Series A Warrants to purchase shares of common stock |
| Trading Symbol | TDW.WS.A |
| Security Exchange Name | NYSE |
| Series B Warrants to purchase shares of common stock [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Series B Warrants to purchase shares of common stock |
| Trading Symbol | TDW.WS.B |
| Security Exchange Name | NYSE |
| Warrant [Member] | |
| Document Information [Line Items] | |
| Title of 12(b) Security | Warrants to purchase shares of common stock |
| Trading Symbol | TDW.WS |
| Security Exchange Name | NYSEAMER |
