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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2016 | Jun. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest income and other, net | $ 1,176 | $ 790
Interest and other debt costs | 16,954 | 13,182
Loss before income taxes | (84,647) | (4,877)
Tax effect | 3,996 | 10,287
Net loss attributable to Tidewater Inc. | (89,097) | (15,052)
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Loss before income taxes | 173 | 241
Net loss attributable to Tidewater Inc. | 173 | 241
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 | 102 | 62
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 | $ 71 | $ 179

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