Document And Entity Information
Mar. 09, 2022
Document Information [Line Items]  
Entity, Registrant Name Tidewater Inc.
Document, Type 8-K
Document, Period End Date Mar. 09, 2022
Entity, Incorporation, State or Country Code DE
Entity, File Number 1-6311
Entity, Tax Identification Number 72-0487776
Entity, Address, Address Line One 842 West Sam Houston Parkway North, 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
Amendment Flag false
Entity, Central Index Key 0000098222
CommonStock Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common stock
Trading Symbol TDW
Security Exchange Name NYSE
SeriesAWarrantsToPurchaseSharesOfCommonStock Custom [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
SeriesBWarrantsToPurchaseSharesOfCommonStock Custom [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
WarrantsToPurchaseSharesOfCommonStock Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Warrants to purchase shares of common stock
Trading Symbol TDW.WS
Security Exchange Name NYSE
PreferredStockPurchaseRights Custom [Member]  
Document Information [Line Items]  
Title of 12(b) Security Preferred stock purchase rights
Trading Symbol N/A
Security Exchange Name NYSE