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Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
September 2013 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	$ 500,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember	$ 500,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember
Weighted average remaining life in years	8 years 4 months 24 days	9 years 4 months 24 days
Weighted average coupon rate on notes outstanding	4.86%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember	4.86%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember
Fair value of debt outstanding	516,879us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember	520,979us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember
August 2011 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	165,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember	165,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
Weighted average remaining life in years	5 years 7 months 6 days	6 years 7 months 6 days
Weighted average coupon rate on notes outstanding	4.42%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember	4.42%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
Fair value of debt outstanding	167,910us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember	168,653us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
September 2010 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	425,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember	425,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
Weighted average remaining life in years	4 years 7 months 6 days	5 years 7 months 6 days
Weighted average coupon rate on notes outstanding	4.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember	4.25%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
Fair value of debt outstanding	431,296us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember	436,254us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
July 2003 Senior Unsecured Notes
Debt [Line Items]
Aggregate debt outstanding	35,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember	35,000us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember
Weighted average remaining life in years	3 months 18 days	1 year 3 months 18 days
Weighted average coupon rate on notes outstanding	4.61%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember	4.61%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember
Fair value of debt outstanding	$ 35,197us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember	$ 36,018us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember

X

- Definition

Weighted Average Life To Maturity

+ References

No definition available.

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X

- Definition

Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 10

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

-SubTopic 10

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13476-108611

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X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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X

- Definition

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).

+ References

Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 9



Reference 3: 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



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Article 5

-Subsection 19, 20, 22

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