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Indebtedness - Senior Debt Notes - Additional Information (Detail)	12 Months Ended		3 Months Ended									1 Months Ended							1 Months Ended				3 Months Ended			1 Months Ended			12 Months Ended	1 Months Ended		12 Months Ended						1 Months Ended			12 Months Ended			0 Months Ended		12 Months Ended			12 Months Ended		0 Months Ended			12 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2015 USD ($)	Jun. 30, 2013 Troms Offshore Supply AS USD ($)	Jun. 30, 2013 Troms Offshore Supply AS NOK	Mar. 31, 2015 Troms Offshore Supply AS USD ($)	Mar. 31, 2015 Troms Offshore Supply AS NOK	Mar. 31, 2014 Troms Offshore Supply AS Floating rate debt USD ($)	Mar. 31, 2014 Troms Offshore Supply AS Floating rate debt NOK	Mar. 31, 2015 Troms Offshore Supply AS Fixed rate debt USD ($)	Mar. 31, 2015 Troms Offshore Supply AS Fixed rate debt NOK	Mar. 31, 2015 Troms Offshore Supply AS Fixed rate debt U.S. dollar denominated debt USD ($)	May 31, 2014 Notes Due May 2015 Troms Offshore Supply AS USD ($)	May 31, 2012 Notes Due May 2015 Troms Offshore Supply AS NOK	Jun. 30, 2013 Senior Notes Due 2019 Troms Offshore Supply AS NOK	Mar. 31, 2015 Notes Due April 2027 Troms Offshore Supply AS USD ($)	Jan. 31, 2014 Notes Due January 2026 Troms Offshore Supply AS NOK	Mar. 31, 2015 Notes Due January 2026 Troms Offshore Supply AS USD ($)	Mar. 31, 2015 Notes Due January 2026 Troms Offshore Supply AS NOK	Jan. 31, 2014 Notes Due May 2024 Troms Offshore Supply AS	May 31, 2012 Notes Due May 2024 Troms Offshore Supply AS NOK	Mar. 31, 2015 Notes Due May 2024 Troms Offshore Supply AS USD ($)	Mar. 31, 2015 Notes Due May 2024 Troms Offshore Supply AS NOK	Sep. 30, 2013 Public bonds Troms Offshore Supply AS USD ($)	Sep. 30, 2013 Public bonds Troms Offshore Supply AS NOK	Mar. 31, 2015 Minimum	May 31, 2012 Minimum Notes Due May 2015 Troms Offshore Supply AS	Jun. 30, 2013 Minimum Senior Notes Due 2019 Troms Offshore Supply AS	Jan. 31, 2014 Minimum Notes Due January 2026 Troms Offshore Supply AS	Mar. 31, 2015 Maximum	May 31, 2012 Maximum Notes Due May 2015 Troms Offshore Supply AS	Jun. 30, 2013 Maximum Senior Notes Due 2019 Troms Offshore Supply AS	Mar. 31, 2015 September 2010 Senior Unsecured Notes USD ($)	Mar. 31, 2014 September 2010 Senior Unsecured Notes USD ($)	Mar. 31, 2011 September 2010 Senior Unsecured Notes USD ($)	Mar. 31, 2015 September 2010 Senior Unsecured Notes Not classified as current maturities of long-term debt USD ($)	Mar. 31, 2015 September 2010 Senior Unsecured Notes Minimum	Mar. 31, 2015 September 2010 Senior Unsecured Notes Maximum	Jul. 31, 2003 July 2003 Senior Unsecured Notes USD ($)	Mar. 31, 2015 July 2003 Senior Unsecured Notes USD ($)	Mar. 31, 2014 July 2003 Senior Unsecured Notes USD ($)	Mar. 31, 2015 July 2003 Senior Unsecured Notes Not classified as current maturities of long-term debt USD ($)	Mar. 31, 2015 July 2003 Senior Unsecured Notes Minimum	Mar. 31, 2015 July 2003 Senior Unsecured Notes Maximum	Nov. 15, 2013 September 2013 Senior Unsecured Notes USD ($)	Sep. 30, 2013 September 2013 Senior Unsecured Notes USD ($)	Mar. 31, 2015 September 2013 Senior Unsecured Notes USD ($)	Mar. 31, 2014 September 2013 Senior Unsecured Notes USD ($)	Sep. 30, 2013 September 2013 Senior Unsecured Notes USD ($)	Mar. 31, 2015 September 2013 Senior Unsecured Notes Minimum	Mar. 31, 2015 September 2013 Senior Unsecured Notes Maximum	Aug. 15, 2011 August 2011 Senior Unsecured Notes USD ($)	Mar. 31, 2015 August 2011 Senior Unsecured Notes USD ($)	Mar. 31, 2014 August 2011 Senior Unsecured Notes USD ($)	Mar. 31, 2015 August 2011 Senior Unsecured Notes Minimum	Mar. 31, 2015 August 2011 Senior Unsecured Notes Maximum
Debt [Line Items]
Senior note issuable amount under purchase agreement																																																$ 500,000,000tdw_NotesIssuableInExchangeFaceAmount / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember
Sale of debt outstanding																																		425,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember				300,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember						200,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember	300,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember	500,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember					165,000,000us-gaap_ProceedsFromIssuanceOfUnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
Debt instrument maturity, in years																																				5 years	12 years					7 years	12 years						7 years	12 years				8 years	10 years
Consolidated debt to consolidated total capitalization, ratio																													55.00%tdw_ConsolidatedDebtAsPercentageOfTotalCapitalization / us-gaap_RangeAxis = us-gaap_MaximumMember								55.00%tdw_ConsolidatedDebtAsPercentageOfTotalCapitalization / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember						55.00%tdw_ConsolidatedDebtAsPercentageOfTotalCapitalization / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember							55.00%tdw_ConsolidatedDebtAsPercentageOfTotalCapitalization / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember					55.00%tdw_ConsolidatedDebtAsPercentageOfTotalCapitalization / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Interest coverage ratio																									300.00%tdw_InterestCoverageRatio / us-gaap_RangeAxis = us-gaap_MinimumMember																								300.00%tdw_InterestCoverageRatio / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember / us-gaap_RangeAxis = us-gaap_MinimumMember
After-tax loss relating to interest rate hedges																																1,800,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember	2,400,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
Pre-tax loss relating to interest rate hedges																																2,600,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember	3,700,000us-gaap_OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesBeforeTax / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
Aggregate debt outstanding																																425,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember	425,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember		42,500,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember / us-gaap_StatementScenarioAxis = tdw_ScenarioFiveMember				35,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember	35,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember	35,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember / us-gaap_StatementScenarioAxis = tdw_ScenarioFiveMember					500,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember	500,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember					165,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember	165,000,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
Debt instrument maturity, month and year													2015-05	2019-06	2027-01	2026-01				2024-05															2015-12						2015-07
Debt instruments face amount													35,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyFifteenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	25,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyNineteenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	29,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySevenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	300,000,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySixMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember				204,400,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Semi-annual principal payments															1,200,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySevenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	12,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySixMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember				8,500,000us-gaap_DebtInstrumentPeriodicPaymentPrincipal / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Debt instrument bearing floating interest rate															2.91%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySevenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember													2.31%us-gaap_LongTermDebtPercentageBearingVariableInterestRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySixMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Indebtedness rate															1.30%tdw_DebtInstrumentAggregateRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySevenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	1.50%tdw_DebtInstrumentAggregateRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySixMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember			1.50%tdw_DebtInstrumentAggregateRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Total capitalization rate															4.21%tdw_CapitalizationRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySevenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	3.81%tdw_CapitalizationRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySixMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember			5.38%tdw_CapitalizationRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Debt instrument outstanding amount	1,514,870,000us-gaap_LongTermDebt	1,534,476,000us-gaap_LongTermDebt			5,600,000us-gaap_LongTermDebt / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	45,000,000us-gaap_LongTermDebt / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	5,600,000us-gaap_LongTermDebt / tdw_DebtInstrumentInterestRateAxis = tdw_FloatingRateDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	45,000,000us-gaap_LongTermDebt / tdw_DebtInstrumentInterestRateAxis = tdw_FloatingRateDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	54,400,000us-gaap_LongTermDebt / tdw_DebtInstrumentInterestRateAxis = tdw_FixedRateDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	436,900,000us-gaap_LongTermDebt / tdw_DebtInstrumentInterestRateAxis = tdw_FixedRateDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	29,500,000us-gaap_LongTermDebt / tdw_DebtInstrumentInterestRateAxis = tdw_FixedRateDebtMember / tdw_DebtOutstandingTypeAxis = tdw_UnitesStatesDollarDenominatedDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember				29,500,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySevenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember		34,200,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySixMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	275,000,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentySixMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember			20,200,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	161,900,000us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Debt instrument bearing interest rate																			3.88%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	6.38%us-gaap_LongTermDebtPercentageBearingFixedInterestRate / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyTwentyFourMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Interest rate																										2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyFifteenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_RangeAxis = us-gaap_MinimumMember	2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyNineteenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_RangeAxis = us-gaap_MinimumMember			3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyFifteenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_RangeAxis = us-gaap_MaximumMember	3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyNineteenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Debt instrument repayment												15,000,000us-gaap_RepaymentsOfDebt / us-gaap_DebtInstrumentAxis = tdw_SeniorNotesDueTwentyFifteenMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Debt instrument estimated fair value									54,100,000us-gaap_LongTermDebtFairValue / tdw_DebtInstrumentInterestRateAxis = tdw_FixedRateDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	435,000,000us-gaap_LongTermDebtFairValue / tdw_DebtInstrumentInterestRateAxis = tdw_FixedRateDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	29,500,000us-gaap_LongTermDebtFairValue / tdw_DebtInstrumentInterestRateAxis = tdw_FixedRateDebtMember / tdw_DebtOutstandingTypeAxis = tdw_UnitesStatesDollarDenominatedDebtMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Debt extinguished amount			32,500,000us-gaap_RepaymentsOfSecuredDebt / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	188,900,000us-gaap_RepaymentsOfSecuredDebt / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember																			82,100,000us-gaap_RepaymentsOfSecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	500,000,000us-gaap_RepaymentsOfSecuredDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Repayment of bond at average price as a percentage of par value																							105.00%tdw_LongTermDebtAveragePricePercentageOfParValue / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	105.00%tdw_LongTermDebtAveragePricePercentageOfParValue / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember
Loss on early extinguishment of bond	$ (4,144,000)us-gaap_GainsLossesOnExtinguishmentOfDebt																						$ (4,100,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember	(26,000,000)us-gaap_GainsLossesOnExtinguishmentOfDebt / us-gaap_DebtInstrumentAxis = us-gaap_BondsMember / dei_LegalEntityAxis = tdw_TromsOffshoreSupplyAsMember

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a set, unchanging rate.

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The interest rate applicable to the portion of the carrying amount of long-term borrowings outstanding as of the balance sheet date, including current maturities, which accrues interest at a rate subject to change from time to time.

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Amount before tax, after reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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