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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income and other, net $ 355 $ 499 $ 1,145 $ 1,121
Interest and other debt costs (13,247) (12,559) (26,429) (25,688)
Earnings (loss) before income taxes (32,611) 81,892 (37,488) 139,383
Tax effect 11,388 21,067 21,675 34,859
Net earnings (loss) attributable to Tidewater Inc. (43,835) 60,907 (58,887) 104,580
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Earnings (loss) before income taxes 374 283 744 567
Tax effect 131 99 260 198
Net earnings (loss) attributable to Tidewater Inc. 243 184 484 369
Reclassification out of Accumulated Other Comprehensive Income | Available for Sale Securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest income and other, net 97 103 192 209
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swaps        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest and other debt costs $ 277 $ 180 $ 552 $ 358