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Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Unrealized gains/(losses) on available-for-sale securities, tax $ 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 115us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ (200)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Amortization of loss on derivative contract, tax 0tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax 251tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax 251tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax
Change in supplemental executive retirement plan pension liability, tax 0tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease 409tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease 1,306tdw_OtherComprehensiveIncomeSupplementalExecutiveRetirementPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease
Change in Pension Plan minimum liability, tax 0tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease 763tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease (290)tdw_OtherComprehensiveIncomePensionPlanMinimumLiabilityAdjustmentTaxPeriodIncreaseDecrease
Change in Other Benefit Plan minimum liability, tax $ (769)us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 1,109us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 111us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax