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Summary of Long-Term Debt Outstanding (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | $ 1,534,476 us-gaap_LongTermDebt |  | $ 1,514,870 us-gaap_LongTermDebt |
Less: Current maturities of long-term debt | 10,181 us-gaap_LongTermDebtCurrent |  | 9,512 us-gaap_LongTermDebtCurrent |
Total | 1,524,295 us-gaap_LongTermDebtNoncurrent |  | 1,505,358 us-gaap_LongTermDebtNoncurrent |
4.61% July 2003 Senior Notes Due Fiscal 2016 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 35,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointSixOnePercentJulyTwoThousandThreeSeniorNotesDueFiscalTwoThousandSixteenMember |  | 35,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointSixOnePercentJulyTwoThousandThreeSeniorNotesDueFiscalTwoThousandSixteenMember |
3.28% September 2010 Senior Notes Due Fiscal 2016 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 42,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_ThreePointTwoEightPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandSixteenMember |  | 42,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_ThreePointTwoEightPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandSixteenMember |
3.90% September 2010 Senior Notes Due Fiscal 2018 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 44,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_ThreePointNineZeroPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandEighteenMember |  | 44,500 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_ThreePointNineZeroPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandEighteenMember |
3.95% September 2010 Senior Notes Due Fiscal 2018 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 25,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_ThreePointNineFivePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandEighteenMember |  | 25,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_ThreePointNineFivePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandEighteenMember |
4.12% September 2010 Senior Notes Due Fiscal 2019 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 25,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointOneTwoPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandNineteenMember |  | 25,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointOneTwoPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandNineteenMember |
4.17% September 2010 Senior Notes Due Fiscal 2019 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 25,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointOneSevenPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandNineteenMember |  | 25,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointOneSevenPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandNineteenMember |
4.33% September 2010 Senior Notes Due Fiscal 2020 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 50,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointThreeThreePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyMember |  | 50,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointThreeThreePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyMember |
4.51% September 2010 Senior Notes Due Fiscal 2021 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 100,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointFiveOnePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyOneMember |  | 100,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointFiveOnePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyOneMember |
4.56% September 2010 Senior Notes Due Fiscal 2021 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 65,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointFiveSixPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyOneMember |  | 65,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointFiveSixPercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyOneMember |
4.61% September 2010 Senior Notes Due Fiscal 2023 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 48,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointSixOnePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyThreeMember |  | 48,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointSixOnePercentSeptemberTwoThousandTenSeniorNotesDueFiscalTwoThousandTwentyThreeMember |
4.06% August 2011 Senior Notes Due Fiscal 2019 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 50,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointZeroSixPercentAugustTwoThousandElevenSeniorNotesDueFiscalTwoThousandNineteenMember |  | 50,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointZeroSixPercentAugustTwoThousandElevenSeniorNotesDueFiscalTwoThousandNineteenMember |
4.54% August 2011 Senior Notes Due Fiscal 2022 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 65,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointFiveFourPercentAugustTwoThousandElevenSeniorNotesDueFiscalTwoThousandTwentyTwoMember |  | 65,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointFiveFourPercentAugustTwoThousandElevenSeniorNotesDueFiscalTwoThousandTwentyTwoMember |
4.64% August 2011 Senior Notes Due Fiscal 2022 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 50,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointSixFourPercentAugustTwoThousandElevenSeniorNotesDueFiscalTwoThousandTwentyTwoMember |  | 50,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointSixFourPercentAugustTwoThousandElevenSeniorNotesDueFiscalTwoThousandTwentyTwoMember |
4.26% September 2013 senior notes due fiscal 2021 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 123,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointTwoSixPercentSeptemberTwentyThirteenSeniorNotesDueFiscalTwentyTwentyOneMember |  | 123,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FourPointTwoSixPercentSeptemberTwentyThirteenSeniorNotesDueFiscalTwentyTwentyOneMember |
5.01% September 2013 senior notes due fiscal 2024 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 250,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FivePointZeroOnePercentSeptemberTwentyThirteenSeniorNotesDueFiscalTwentyTwentyFourMember |  | 250,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FivePointZeroOnePercentSeptemberTwentyThirteenSeniorNotesDueFiscalTwentyTwentyFourMember |
5.16% September 2013 senior notes due fiscal 2026 |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 127,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FivePointOneSixPercentSeptemberTwentyThirteenSeniorNotesDueFiscalTwentyTwentySixMember |  | 127,000 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_FivePointOneSixPercentSeptemberTwentyThirteenSeniorNotesDueFiscalTwentyTwentySixMember |
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Five |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 20,152 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedNotesDueFiscalTwoThousandTwentyFiveMember |  | 29,837 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedNotesDueFiscalTwoThousandTwentyFiveMember |
Norwegian Kroner Denominated Notes Due Fiscal Two Thousand Twenty Six |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 34,234 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedNotesDueFiscalTwoThousandTwentySixMember |  | 50,028 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedNotesDueFiscalTwoThousandTwentySixMember |
Norwegian Kroner Denominated Borrowing Agreement Due Fiscal Two Thousand Sixteen |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 2,490 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedBorrowingAgreementDueFiscalTwoThousandSixteenMember |  | 5,837 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedBorrowingAgreementDueFiscalTwoThousandSixteenMember |
Norwegian Kroner Denominated Borrowing Agreement Due Fiscal Two Thousand Nineteen |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 3,112 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedBorrowingAgreementDueFiscalTwoThousandNineteenMember |  | 4,168 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_NorwegianKronerDenominatedBorrowingAgreementDueFiscalTwoThousandNineteenMember |
United States Dollar Denominated Borrowing Agreement Due Fiscal Two Thousand Twenty Seven |  |  |  |
Debt [Line Items] |  |  |  |
Long-Term Debt Outstanding | 29,488 us-gaap_LongTermDebt / us-gaap_DebtInstrumentAxis = tdw_UnitedStatesDollarDenominatedBorrowingAgreementDueFiscalTwoThousandTwentySevenMember |  |  |
Term Loan Facility Due Twenty Nineteen |  |  |  |
Debt [Line Items] |  |  |  |
Term loan | 300,000 tdw_LineOfCreditFacilityTermLoan / us-gaap_DebtInstrumentAxis = tdw_TermLoanFacilityDueTwentyNineteenMember | [1] | 300,000 tdw_LineOfCreditFacilityTermLoan / us-gaap_DebtInstrumentAxis = tdw_TermLoanFacilityDueTwentyNineteenMember | [1]
Revolving Line Of Credit Due Fiscal Twenty Nineteen |  |  |  |
Debt [Line Items] |  |  |  |
Revolving line of credit | $ 20,000 tdw_LineOfCreditFacilityRevolvingLineOfCredit / us-gaap_DebtInstrumentAxis = tdw_RevolvingLineOfCreditDueFiscalTwentyNineteenMember | [1] |  |
[1] | In May 2015, the company amended its existing credit facility, extending the due dates of the bank term loan and revolving line of credit until fiscal 2020. Refer to Note (19) for additional information regarding the amended and extended credit facility.

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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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