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

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

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