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Schedule of Deferred Tax Not Recognized (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015
Deferred Tax Assets Liabilities [Line Items] |
Foreign income not recognized for U.S. deferred taxes | $ 2,578,133 tdw_AmountOfForeignEarningsNotCurrentlyRecognizedForUSTaxation

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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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- Details
Name: | tdw_DeferredTaxAssetsLiabilitiesLineItems
Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration