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Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Unrealized gains/(losses) on available-for-sale securities, tax $ (29)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 218us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 43us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax $ 185us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax
Amortization of loss on derivative contract, Tax 62tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax 62tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax 188tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax 188tdw_OtherComprehensiveIncomeAmortizationOfLossOnDerivativeContractTax
Change in other benefit plan minimum liability, tax $ 0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 70us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax $ 0us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax