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Schedule of Deferred Tax Not Recognized (Detail) $ in Thousands | 12 Months Ended
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Mar. 31, 2017 USD ($)
Income Tax Disclosure [Abstract] |
Foreign income not recognized for U.S. deferred taxes | $ 1,805,626

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- Definition Amount Of Foreign Earnings Not Currently Recognized For U.S. Taxation + References No definition available. + Details
Name: | tdw_AmountOfForeignEarningsNotCurrentlyRecognizedForUSTaxation
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration