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Gain on Disposition of Assets, Net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2013
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Amortized gains on sale/leaseback transactions | $ 17.7 us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized |  |
Reversal of accrued liability | 3 tdw_DisposalGroupIncludingDiscontinuedOperationGainLossOnReversalOfAccruedLiabilities |  |
Gain related to sale of asset |  | $ 4.0 us-gaap_GainsLossesOnSalesOfAssets | $ 2.3 us-gaap_GainsLossesOnSalesOfAssets

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- Definition Disposal Group, Including Discontinued Operation, Gain (Loss) on Reversal of Accrued Liabilities + References No definition available. + Details
Name: | tdw_DisposalGroupIncludingDiscontinuedOperationGainLossOnReversalOfAccruedLiabilities
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of gain (loss) on sale or disposal of assets utilized in financial service operations. + References No definition available. + Details
Name: | us-gaap_GainsLossesOnSalesOfAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35688829&loc=d3e50609-112754 + Details
Name: | us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration