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Schedule of Unrecognized Tax Benefits Which Would Lower Effective Tax Rate if Realized (Detail) (State and Local Jurisdiction, USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Sep. 30, 2014
State and Local Jurisdiction |
Income Tax Contingency [Line Items] |
Unrecognized tax benefit related to state tax issues | $ 11,230
Interest receivable on unrecognized tax benefit related to state tax issues | $ 28

X
- Definition This element represents an interest income receivable on an uncertain tax position. + References No definition available. + Details
Name: | tdw_UnrecognizedTaxBenefitInterestIncomeReceivable
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The gross amount of unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return. + References No definition available. + Details
Name: | tdw_UnrecognizedTaxBenefitsCurrentAndPriorPeriodTaxPositions
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration