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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net | $ 992 | $ 355 | $ 2,168 | $ 1,145
Interest and other debt costs | 18,477 | 13,247 | 35,431 | 26,429
Loss before income taxes | (174,055) | (32,611) | (258,702) | (37,488)
Tax effect | 3,568 | 11,388 | 7,564 | 21,675
Net loss attributable to Tidewater Inc. | (178,490) | (43,835) | (267,587) | (58,887)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Loss before income taxes | 112 | 374 | 285 | 744
Tax effect |  | 131 |  | 260
Net loss attributable to Tidewater Inc. | 112 | 243 | 285 | 484
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 | 40 | 97 | 142 | 192
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 | $ 72 | $ 277 | $ 143 | $ 552

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