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Schedule of Vessel Commitments (Parenthetical) (Detail) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2015 USD ($) Vessel | Mar. 31, 2016 USD ($) Vessel
Significant Purchase and Supply Commitment [Line Items] |  |
Number of vessels under construction | 9 |
Refunds from cancelled vessel construction contracts | $ | $ 31 | $ 31
Option Agreement |  |
Significant Purchase and Supply Commitment [Line Items] |  |
Number of vessels under construction |  | 6

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- Definition Refunds from cancelled vessel construction contracts. + References No definition available. + Details
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Balance Type: | debit
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- Definition Significant commitments, new construction. + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Significant Purchase and Supply Commitment [Line Items] + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |