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Stock-Based Compensation and Incentive Plans - Additional Information (Detail) (USD $) | 12 Months Ended |
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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 | 1,370,056 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,556,275 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,709,206 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 1,725,424 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Intrinsic value of options outstanding |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue |
Intrinsic value of options exercisable |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue |
Fair value of non-vested shares | $ 48.68 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue | $ 50.48 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue | 39.53 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue | $ 50.56 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue
Director stock payment period, units | 15 tdw_DirectorStockPaymentPeriodInDays | 15 tdw_DirectorStockPaymentPeriodInDays |  |
Optional payment installments, annual |  | 15 tdw_OptionalPaymentInstallmentsAnnual |  |
Director |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Value of stock units granted | 115,000 us-gaap_DeferredCompensationArrangementWithIndividualFairValueOfSharesIssued / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember | 100,000 us-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 | 2 tdw_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 | 10 tdw_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 |  |  | 2,300,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |
Total unrecognized stock compensation costs, net of tax |  |  | 1,300,000 tdw_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 |  |  | 500,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Total unrecognized stock compensation costs, net of tax |  |  | 500,000 tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Time-based stock vesting period, years |  |  | 4 tdw_TimeBasedStockVestingPeriodYears / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |
Fair value of non-vested shares | $ 54.75 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 50.95 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 56.94 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | $ 51.43 us-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 |  |  | 24,291 us-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 |  |  | 68,405 us-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 |  |  | 16,600,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |
Total unrecognized stock compensation costs, net of tax |  |  | 11,400,000 tdw_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 |  |  | 156,772 us-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 |  |  | 92,194 us-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 |  |  | 13,400,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember |
Total unrecognized stock compensation costs, net of tax |  |  | 10,800,000 tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember |
Fair value of non-vested shares | $ 50.94 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | $ 51.74 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | 24.07 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue / us-gaap_AwardTypeAxis = tdw_PhantomStockPlanMember | $ 49.23 us-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 |  |  | 196,047 us-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 |  |  | 19.14 us-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 |  |  | 4,900,000 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember |
Total unrecognized stock compensation costs, net of tax |  |  | 3,300,000 tdw_EmployeeServiceSharebasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedNet / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember |
Share based compensation outstanding number |  |  | 0 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember |
Fair value of non-vested shares |  |  | 1.10 us-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 |  |  | 2 tdw_ShareBasedCompensationAgreementCashSettlementPricePerShare / us-gaap_AwardTypeAxis = tdw_PerformanceBasedUnitMember / us-gaap_RangeAxis = us-gaap_MaximumMember |

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- Definition The total fair value of shares issued during the period under a deferred compensation arrangement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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