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Document and Entity Information (USD $)
 12 Months Ended
Mar. 31, 2014
Apr. 30, 2014
Sep. 30, 2013
Document Information [Line Items]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Mar. 31, 2014    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY    
Trading Symbol TDW    
Entity Registrant Name TIDEWATER INC    
Entity Central Index Key 0000098222    
Current Fiscal Year End Date --03-31    
Entity Well-known Seasoned Issuer Yes    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Common Stock, Shares Outstanding   49,730,442  
Entity Public Float     $ 2,907,095,275