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Schedule of Tax Rate Applicable to Pre-Tax Earning, U.S. Federal Statutory Rate (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Reconciliation of Statutory Federal Tax Rate [Line Items]
Computed "expected" tax expense	$ (23,193)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 60,567us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	$ 68,307us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Foreign income taxed at different rates	(13,570)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(18,536)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential	(23,965)us-gaap_IncomeTaxReconciliationForeignIncomeTaxRateDifferential
Foreign tax credits not previously recognized		(483)tdw_ForeignTaxCreditsNotPreviouslyRecognized	(398)tdw_ForeignTaxCreditsNotPreviouslyRecognized
Expenses which are not deductible for tax purposes	472tdw_IncomeTaxExpensesNotDeductibleForTaxPurposes	720tdw_IncomeTaxExpensesNotDeductibleForTaxPurposes	498tdw_IncomeTaxExpensesNotDeductibleForTaxPurposes
Non-deductible goodwill	15,811us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses	2,941us-gaap_IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
Reversal of basis difference - sale leaseback		(3,369)tdw_SaleLeasebackTransactionTransferTaxes
Valuation allowance - deferred tax assets	17,829us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	(5,821)us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	5,821us-gaap_IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance
Amortization of deferrals associated with intercompany sales to foreign tax jurisdictions	(2,358)us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization	(1,475)us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization	(6,232)us-gaap_IncomeTaxReconciliationNondeductibleExpenseAmortization
Expenses which are not deductible for book purposes	(832)tdw_IncomeTaxExpensesNotDeductibleForBookPurposes	(2,144)tdw_IncomeTaxExpensesNotDeductibleForBookPurposes
Foreign taxes	5,688us-gaap_IncomeTaxReconciliationTaxCreditsForeign
State taxes	(6)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	3us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes	(203)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Other, net	(918)us-gaap_IncomeTaxReconciliationOtherAdjustments	390us-gaap_IncomeTaxReconciliationOtherAdjustments	585us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax expense (benefit), Total	$ (1,077)us-gaap_IncomeTaxExpenseBenefit	$ 32,793us-gaap_IncomeTaxExpenseBenefit	$ 44,413us-gaap_IncomeTaxExpenseBenefit

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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