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Commitments and Contingencies - Additional Information (Detail) $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 USD ($) Vessel T | Mar. 31, 2016 USD ($) | Jul. 31, 2017 USD ($)
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Accumulated costs of rejected vessel | [1] | $ 7,007 |  |
Fast, Crew/Supply Boat |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Number of vessels under construction | Vessel |  | 1 |  |
Remaining accumulated cost reclassified from construction in progress to other assets as insurance receivable |  |  | $ 5,600 |
Remaining insurance receivable |  | $ 1,800 |  | $ 1,800
Vessel Commitments |  |  |  |
Significant Purchase and Supply Commitment [Line Items] |  |  |  |
Remaining Balance, commitments |  | $ 5,500 |  |
Number of Vessels, commitments | Vessel |  | 1 |  |
Significant commitment, new construction deadweight tons capacity | T |  | 5,400 |  |
Refund amount demanded to shipyard |  | $ 43,000 |  |
Accumulated costs of rejected vessel |  | 48,700 |  |
Value of each vessels |  | $ 7,000 |  |
[1] | Refer to Note (10) of Notes to Condensed Consolidated Financial Statements for additional information regarding the vessel rejected at the time of delivery.

X
- Definition Accumulated cost reclassified from construction in progress to other assets as an insurance receivable. + References No definition available. + Details
Name: | tdw_AccumulatedCostReclassifiedFromConstructionInProgressToOtherAssetsAsInsuranceReceivable
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Accumulated costs of rejected vessel. + References No definition available. + Details
Name: | tdw_AccumulatedCostsOfRejectedVessel
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Commitments, remaining expenditures. + References No definition available. + Details
Name: | tdw_CommitmentsRemainingExpenditures
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Seeking refund amount demanded to shipyard. + References No definition available. + Details
Name: | tdw_RefundAmountDemandedToShipyard
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Significant Commitment New Construction Dead Weight Tons Capacity + References No definition available. + Details
Name: | tdw_SignificantCommitmentNewConstructionDeadWeightTonsCapacity
Namespace Prefix: | tdw_
Data Type: | num:massItemType
Balance Type: | na
Period Type: | instant

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- Definition Significant commitment number of vessel. + References No definition available. + Details
Name: | tdw_SignificantCommitmentNumberOfVessel
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
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
- Definition Vessels value. + References No definition available. + Details
Name: | tdw_VesselsValue
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount due in settlement of a claim for reimbursement from an insurance company when the Company has suffered a loss covered under an insurance policy. + References No definition available. + Details
Name: | us-gaap_InsuranceSettlementsReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_SupplyCommitmentAxis=tdw_FastCrewSupplyBoatMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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