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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net | $ 1,437 | $ 609 | $ 3,605 | $ 1,754
Interest and other debt costs | 18,587 | 13,312 | 54,018 | 39,741
Loss before income taxes | (299,657) | (24,282) | (558,359) | (61,770)
Tax effect | (2,884) | (4,679) | 4,680 | 16,996
Net loss attributable to Tidewater Inc. | (297,676) | (19,509) | (565,263) | (78,396)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Loss before income taxes | 185 | 240 | 470 | 984
Tax effect |  | 84 |  | 344
Net loss attributable to Tidewater Inc. | 185 | 156 | 470 | 640
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 | 115 | (37) | 257 | 155
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 | $ 70 | $ 277 | $ 213 | $ 829

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