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Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Income (Detail) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Jul. 31, 2017 | Sep. 30, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Interest income and other, net |  | $ 873 |  |  |
Interest and other debt costs |  | 5,240 |  |  |
Loss before income taxes |  | (10,782) |  |  |
Tax effect |  | 4,745 |  |  |
Net loss attributable to Tidewater Inc. |  | (15,693) |  |  |
Predecessor |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Interest income and other, net | $ 704 |  | $ 992 | $ 2,384 | $ 2,168
Interest and other debt costs | 574 |  | 18,477 | 11,179 | 35,431
Loss before income taxes | (1,124,028) |  | (174,055) | (1,648,143) | (258,702)
Tax effect | (1,529) |  | 3,568 | (1,234) | 7,564
Net loss attributable to Tidewater Inc. | (1,122,475) |  | (178,490) | (1,646,909) | (267,587)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Loss before income taxes |  | 75 |  |  |
Net loss attributable to Tidewater Inc. |  | 75 |  |  |
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 |  | $ 75 |  |  |
Reclassification out of Accumulated Other Comprehensive Income | Predecessor |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Loss before income taxes | 26 |  | 112 | 106 | 285
Net loss attributable to Tidewater Inc. | 26 |  | 112 | 106 | 285
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Available for Sale Securities |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Interest income and other, net | $ 26 |  | 40 | $ 106 | 142
Reclassification out of Accumulated Other Comprehensive Income | Predecessor | Interest Rate Swaps |  |  |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Interest and other debt costs |  |  | $ 72 |  | $ 143

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- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
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