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Schedule of Vessel Commitments (Parenthetical) (Detail) $ in Millions | 6 Months Ended
--- | ---
Sep. 30, 2016 USD ($) Vessel
Significant Purchase and Supply Commitment [Line Items] |
Refunds from cancelled vessel construction contracts | $ | $ 14.3
Option Agreement |
Significant Purchase and Supply Commitment [Line Items] |
Number of vessels under construction | Vessel | 6

X
- Definition Refunds from cancelled vessel construction contracts. + References No definition available. + Details
Name: | tdw_RefundsFromCancelledVesselConstructionContracts
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Significant commitments, new construction. + References No definition available. + Details
Name: | tdw_SignificantCommitmentsNewConstruction
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | us-gaap_LongTermPurchaseCommitmentByCategoryOfItemPurchasedAxis=tdw_OptionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |