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Schedule of Aggregate Amount of Senior Unsecured Notes Outstanding (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
September 2013 Senior Unsecured Notes |  |
Debt [Line Items] |  |
Aggregate debt outstanding | $ 500,000 us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember | $ 500,000 us-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 | 516,879 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember | 520,979 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwoThousandThirteenSeniorUnsecuredNotesMember
August 2011 Senior Unsecured Notes |  |
Debt [Line Items] |  |
Aggregate debt outstanding | 165,000 us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember | 165,000 us-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 | 167,910 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember | 168,653 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_AugustTwoThousandElevenSeniorUnsecuredNotesMember
September 2010 Senior Unsecured Notes |  |
Debt [Line Items] |  |
Aggregate debt outstanding | 425,000 us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember | 425,000 us-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 | 431,296 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember | 436,254 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_SeptemberTwentyTenSeniorUnsecuredNotesMember
July 2003 Senior Unsecured Notes |  |
Debt [Line Items] |  |
Aggregate debt outstanding | 35,000 us-gaap_UnsecuredDebt / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember | 35,000 us-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 | $ 35,197 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember | $ 36,018 us-gaap_DebtInstrumentFairValue / us-gaap_LongtermDebtTypeAxis = tdw_JulyTwoThousandThreeSeniorUnsecuredNotesMember

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- 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 + Details
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- 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 + Details
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