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Stock-Based Compensation and Incentive Plans - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2014 D	Mar. 31, 2013 Installment D	Mar. 31, 2015	Mar. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding	1,370,056us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,556,275us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,709,206us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1,725,424us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Intrinsic value of options outstanding			0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue
Intrinsic value of options exercisable			0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
Fair value of non-vested shares	$ 48.68us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	$ 50.48us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	39.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue	$ 50.56us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Director stock payment period, units	15tdw_DirectorStockPaymentPeriodInDays	15tdw_DirectorStockPaymentPeriodInDays
Optional payment installments, annual		15tdw_OptionalPaymentInstallmentsAnnual
Director
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Value of stock units granted	115,000us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember	100,000us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period			3 months
Optional payment installments, annual	2tdw_OptionalPaymentInstallmentsAnnual / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option expiration period			10 years
Optional payment installments, annual	10tdw_OptionalPaymentInstallmentsAnnual / us-gaap_RangeAxis = us-gaap_MaximumMember
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period, years			3 years
Post retirement period to exercise vested options			2 years
Total unrecognized stock compensation costs			2,300,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Total unrecognized stock compensation costs, net of tax			1,300,000tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock compensation costs			500,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Total unrecognized stock compensation costs, net of tax			500,000tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Time-based stock vesting period, years			4tdw_TimeBasedStockVestingPeriodYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Fair value of non-vested shares	$ 54.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 50.95us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	56.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember	$ 51.43us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Restricted Stock | Time Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation outstanding number			24,291us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementClassOfStockAxis = tdw_TimeBasedRestrictedStockAwardsMember
Restricted Stock | Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation outstanding number			68,405us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember / us-gaap_StatementClassOfStockAxis = tdw_PerformanceBasedRestrictedStockAwardsMember
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock compensation costs			16,600,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Total unrecognized stock compensation costs, net of tax			11,400,000tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember
Restricted Stock Units (RSUs) | Time Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation outstanding number			156,772us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementClassOfStockAxis = tdw_TimeBasedRestrictedStockAwardsMember
Restricted Stock Units (RSUs) | Performance Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation outstanding number			92,194us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember / us-gaap_StatementClassOfStockAxis = tdw_PerformanceBasedRestrictedStockAwardsMember
Phantom Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock compensation costs			13,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember
Total unrecognized stock compensation costs, net of tax			10,800,000tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember
Fair value of non-vested shares	$ 50.94us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	$ 51.74us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	24.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember	$ 49.23us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember
Phantom Stock Plan | Time Based Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share based compensation outstanding number			196,047us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember / us-gaap_StatementClassOfStockAxis = tdw_TimeBasedRestrictedStockAwardsMember
Phantom Stock Plan | Non-Vested Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of non-vested shares			19.14us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember / us-gaap_StatementClassOfStockAxis = tdw_NonvestedSharesMember
Phantom Stock Plan | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period, years			3 years
Phantom Stock Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period, years			4 years
Cash-based Performance Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock compensation costs			4,900,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember
Total unrecognized stock compensation costs, net of tax			3,300,000tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember
Share based compensation outstanding number			0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember
Fair value of non-vested shares			1.10us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember
Cash-based Performance Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Units awarded, vesting rights amount			2tdw_ShareBasedCompensationAgreementCashSettlementPricePerShare / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember / us-gaap_RangeAxis = us-gaap_MaximumMember

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Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Net

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The total fair value of shares issued during the period under a deferred compensation arrangement.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding.

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