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Indebtedness - Debt Costs - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2016 | Mar. 31, 2016
--- | --- | ---
Debt [Line Items] |  |
Reduction of debt | $ 8.0 | $ 6.8
Minimum |  |
Debt [Line Items] |  |
Interest coverage ratio | 300.00% |

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- Definition Interest Coverage ratio + References No definition available. + Details
Name: | tdw_InterestCoverageRatio
Namespace Prefix: | tdw_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Reduction of debt. + References No definition available. + Details
Name: | tdw_ReductionOfDebt
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |