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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 1 Months Ended 2 Months Ended 3 Months Ended 4 Months Ended 6 Months Ended
Jul. 31, 2017
Sep. 30, 2017
Sep. 30, 2016
Jul. 31, 2017
Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income and other, net   $ 873      
Interest and other debt costs   5,240      
Loss before income taxes   (10,782)      
Tax effect   4,745      
Net loss attributable to Tidewater Inc.   (15,693)      
Predecessor          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income and other, net $ 704   $ 992 $ 2,384 $ 2,168
Interest and other debt costs 574   18,477 11,179 35,431
Loss before income taxes (1,124,028)   (174,055) (1,648,143) (258,702)
Tax effect (1,529)   3,568 (1,234) 7,564
Net loss attributable to Tidewater Inc. (1,122,475)   (178,490) (1,646,909) (267,587)
Reclassification out of Accumulated Other Comprehensive Income          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Loss before income taxes   75      
Net loss attributable to Tidewater Inc.   75      
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   $ 75      
Reclassification out of Accumulated Other Comprehensive Income | Predecessor          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Loss before income taxes 26   112 106 285
Net loss attributable to Tidewater Inc. 26   112 106 285
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Available for Sale Securities          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest income and other, net $ 26   40 $ 106 142
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps          
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]          
Interest and other debt costs     $ 72   $ 143