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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, 2015 | Dec. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Interest income and other, net | $ 609 | $ 434 | $ 1,754 | $ 1,555
Interest and other debt costs | 13,312 | 12,239 | 39,741 | 37,927
Loss before income taxes | (24,282) | (221,051) | (61,770) | (81,668)
Tax effect | (4,679) | (60,070) | 16,996 | (25,211)
Net loss attributable to Tidewater Inc. | (19,509) | (160,694) | (78,396) | (56,114)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Loss before income taxes | 240 | 207 | 984 | 775
Tax effect | 84 | 72 | 344 | 271
Net loss attributable to Tidewater Inc. | 156 | 135 | 640 | 504
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 | (37) | 29 | 155 | 238
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 | $ 178 | $ 829 | $ 537

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