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Document and Entity Information - USD ($)
 12 Months Ended
Mar. 31, 2017
May 31, 2017
Sep. 30, 2016
Document And Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Mar. 31, 2017    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Trading Symbol TDW    
Entity Registrant Name TIDEWATER INC    
Entity Central Index Key 0000098222    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Current Fiscal Year End Date --03-31    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Common Stock, Shares Outstanding   47,121,304  
Entity Public Float     $ 131,788,710