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Amounts Charged to Expense Related to Defined Contribution Plans (Detail) (Defined Contribution Pension Plan 401k, USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Defined Contribution Pension Plan 401k
      
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plans expense, net of forfeitures $ 4,216tdw_DefinedContributionPlanExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tdw_DefinedContributionPensionPlanFourZeroOneKMember		 $ 3,854tdw_DefinedContributionPlanExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tdw_DefinedContributionPensionPlanFourZeroOneKMember		 $ 3,356tdw_DefinedContributionPlanExpense
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tdw_DefinedContributionPensionPlanFourZeroOneKMember
Defined contribution plans forfeitures $ 52tdw_DefinedBenefitPlanForfeitedAmounts
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tdw_DefinedContributionPensionPlanFourZeroOneKMember		 $ 82tdw_DefinedBenefitPlanForfeitedAmounts
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tdw_DefinedContributionPensionPlanFourZeroOneKMember		 $ 115tdw_DefinedBenefitPlanForfeitedAmounts
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= tdw_DefinedContributionPensionPlanFourZeroOneKMember