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Gain on Disposition of Assets, Net - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	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	$ 17.7us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Reversal of accrued liability	3tdw_DisposalGroupIncludingDiscontinuedOperationGainLossOnReversalOfAccruedLiabilities
Gain related to sale of asset		$ 4.0us-gaap_GainsLossesOnSalesOfAssets	$ 2.3us-gaap_GainsLossesOnSalesOfAssets

X

- 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

X

- 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

X

- Details

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

X

- 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