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Document And Entity Information - USD ($)
Dec. 31, 2020
Apr. 12, 2021
Jun. 30, 2020
Document Information [Line Items]      
Entity, Registrant Name Tidewater Inc.    
Current Fiscal Year End Date --12-31    
Document, Fiscal Period Focus FY    
Document, Fiscal Year Focus 2020    
Document, Type 10-K/A    
Document, Annual Report true    
Document, Period End Date Dec. 31, 2020    
Document, Transition Report false    
Entity, File Number 1-6311    
Entity, Incorporation, State or Country Code DE    
Entity, Tax Identification Number 72-0487776    
Entity, Address, Address Line One 6002 Rogerdale Road    
Entity, Address, Address Line Two Suite 600    
Entity, Address, City or Town Houston    
Entity, Address, State or Province TX    
Entity, Address, Postal Zip Code 77072    
City Area Code 713    
Local Phone Number 470-5300    
Entity, Well-known Seasoned Issuer No    
Entity, Voluntary Filers No    
Entity, Current Reporting Status Yes    
Entity, Interactive Data, Current Yes    
Entity, Filer Category Accelerated Filer    
Entity, Small Business false    
Entity, Emerging Growth Company false    
Entity, Shell Company false    
Entity, Public Float     $ 224,000,000.0
Entity, Common Stock Shares, Outstanding   40,731,777  
Amendment Description On March 4, 2021, Tidewater Inc. filed its Annual Report on Form 10-K for the fiscal year ended December 31, 2020 (the “Original Form 10-K”) with the Securities and Exchange Commission (the “SEC”). Tidewater is filing this Amendment No. 1 on Form 10-K/A (the “Form 10-K/A”) because it may not file its definitive proxy statement within 120 days after the end of such fiscal year. Therefore, this Form 10-K/A is being filed to provide the information required in Part III of Form 10-K.    
Amendment Flag true    
Entity, Central Index Key 0000098222    
CommonStock0001ParValuePerShare Custom [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    
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 NYSEAMER    
PreferredStockPurchaseRights Custom [Member]      
Document Information [Line Items]      
Title of 12(b) Security Preferred stock purchase rights    
Trading Symbol N/A    
Security Exchange Name NYSE