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Schedule of Income Tax Expense (Benefit) (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Reconciliation of Provision of Income Taxes [Line Items]      
Current, Federal, Income tax expense (benefit) $ 4,869us-gaap_CurrentFederalTaxExpenseBenefit $ (602)us-gaap_CurrentFederalTaxExpenseBenefit $ (7,633)us-gaap_CurrentFederalTaxExpenseBenefit
Deferred, Federal, Income tax expense (benefit) (72,389)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (34,226)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (11,335)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Federal, Income tax expense (benefit) (67,520)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations (34,828)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations (18,968)us-gaap_FederalIncomeTaxExpenseBenefitContinuingOperations
Current, State, Income tax expense (benefit) (9)us-gaap_CurrentStateAndLocalTaxExpenseBenefit 4us-gaap_CurrentStateAndLocalTaxExpenseBenefit (313)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Deferred, State, Income tax expense (benefit) 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 0us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
State, Income tax expense (benefit) (9)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations 4us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations (313)us-gaap_StateAndLocalIncomeTaxExpenseBenefitContinuingOperations
Current, International, Income tax expense (benefit) 66,452us-gaap_CurrentForeignTaxExpenseBenefit 68,100us-gaap_CurrentForeignTaxExpenseBenefit 64,092us-gaap_CurrentForeignTaxExpenseBenefit
Deferred, International, Income tax expense (benefit)   (483)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (398)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
International, Income tax expense (benefit) 66,452us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 67,617us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations 63,694us-gaap_ForeignIncomeTaxExpenseBenefitContinuingOperations
Current, Total, Income tax expense (benefit) 71,312us-gaap_CurrentIncomeTaxExpenseBenefit 67,502us-gaap_CurrentIncomeTaxExpenseBenefit 56,146us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred, Total, Income tax expense (benefit) (72,389)tdw_TotalDeferredIncomeTaxExpenseBenefit (34,709)tdw_TotalDeferredIncomeTaxExpenseBenefit (11,733)tdw_TotalDeferredIncomeTaxExpenseBenefit
Income tax expense (benefit), Total $ (1,077)us-gaap_IncomeTaxExpenseBenefit $ 32,793us-gaap_IncomeTaxExpenseBenefit $ 44,413us-gaap_IncomeTaxExpenseBenefit