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Reclassifications from Accumulated Other Comprehensive Loss to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Jun. 30, 2015 | Jun. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest income and other, net | $ 790 | $ 622
Interest and other debt costs, net | (13,182) | (13,129)
Earnings (loss) before income taxes | (4,877) | 57,491
Tax effect | 10,287 | 13,792
Net earnings (loss) attributable to Tidewater Inc. | (15,052) | 43,673
Reclassification out of Accumulated Other Comprehensive Income |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Earnings (loss) before income taxes | 241 | 286
Tax effect |  | 100
Net earnings (loss) attributable to Tidewater Inc. | 241 | 186
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 | 62 | 108
Reclassification out of Accumulated Other Comprehensive Income | Interest Rate Swap |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Interest and other debt costs, net | $ 179 | $ 178

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