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Schedule of Expected Amounts of Net Periodic Benefit Costs (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized prior service cost (benefit) | $ (988)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember | $ (1,103)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember
Pension Plans, Defined Benefit | Next Fiscal Year |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized actuarial loss | (2,213)us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / tdw_PostemploymentAndOtherReorganizationCostsAxis = tdw_FuturePeriodMember |
Unrecognized prior service cost (benefit) | (36)us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_PensionPlansDefinedBenefitMember / tdw_PostemploymentAndOtherReorganizationCostsAxis = tdw_FuturePeriodMember |
Other Pension Plans, Defined Benefit |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized prior service cost (benefit) | 1,299 us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember | 395 us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember
Other Pension Plans, Defined Benefit | Next Fiscal Year |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Unrecognized actuarial loss | 582 us-gaap_DefinedBenefitPlanFutureAmortizationOfGainLoss / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember / tdw_PostemploymentAndOtherReorganizationCostsAxis = tdw_FuturePeriodMember |
Unrecognized prior service cost (benefit) | $ 2,041 us-gaap_DefinedBenefitPlanFutureAmortizationOfPriorServiceCostCredit / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = us-gaap_OtherPensionPlansDefinedBenefitMember / tdw_PostemploymentAndOtherReorganizationCostsAxis = tdw_FuturePeriodMember |

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- Definition Amount included in accumulated other comprehensive income (AOCI) related to gain (loss) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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