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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
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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 | $ 4,216 tdw_DefinedContributionPlanExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember | $ 3,854 tdw_DefinedContributionPlanExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember | $ 3,356 tdw_DefinedContributionPlanExpense / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember
Defined contribution plans forfeitures | $ 52 tdw_DefinedBenefitPlanForfeitedAmounts / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember | $ 82 tdw_DefinedBenefitPlanForfeitedAmounts / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember | $ 115 tdw_DefinedBenefitPlanForfeitedAmounts / us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis = tdw_DefinedContributionPensionPlanFourZeroOneKMember

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- Definition Defined Benefit Plan Forfeited Amounts + References No definition available. + Details
Name: | tdw_DefinedBenefitPlanForfeitedAmounts
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Defined Contribution Plan Expense + References No definition available. + Details
Name: | tdw_DefinedContributionPlanExpense
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_DefinedBenefitPlanDisclosureLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration