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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Net (loss) earnings | $ (65,349)us-gaap_ProfitLoss | $ 140,255 us-gaap_ProfitLoss | $ 150,750 us-gaap_ProfitLoss
Other comprehensive income (loss): |  |  |
Unrealized gains (losses) on available for sale securities, net of tax of $0, $115 and ($200), respectively | 143 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | 213 us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax | (372)us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax
Amortization of loss on derivative contract, net of tax of $0, $251 and $251, respectively | 717 tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContract | 466 tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContract | 466 tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContract
Change in supplemental executive retirement plan pension liability, net of tax of $0, $409 and $1,306 respectively | (1,845)tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease | 760 tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease | 2,427 tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease
Change in pension plan minimum liability, net of tax of $0, $763 and ($290), respectively | (5,739)tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease | 1,417 tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease | (539)tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentNetOfTaxPeriodIncreaseDecrease
Change in other benefit plan minimum liability, net of tax of $(769), $1,109 and $111, respectively | (1,429)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 2,060 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax | 207 us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
Total comprehensive (loss) income | $ (73,502)us-gaap_ComprehensiveIncomeNetOfTax | $ 145,171 us-gaap_ComprehensiveIncomeNetOfTax | $ 152,939 us-gaap_ComprehensiveIncomeNetOfTax

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- Definition Net changes to accumulated comprehensive income during the period related to Supplemental Executive Retirement defined benefit plans, after tax. + References No definition available. + Details
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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=35737396 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=36458714&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36458714&loc=SL7669646-108580 + Details
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