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Sale/ Leaseback Arrangements - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended
	Sep. 30, 2016 USD ($) Vessel	Sep. 30, 2016 USD ($) Vessel
Sale Leaseback Transaction [Line Items]
Deferred gains on sale/leaseback transactions | $	$ 5.9	$ 11.7
Sale/Leaseback Arrangement
Sale Leaseback Transaction [Line Items]
Number of vessels operating	16	16
Number of vessels stacked	9	9

X

- Definition

Number of vessels.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVessel
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Number of vessels stacked.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsStacked
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

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

X

- Details

Name:	us-gaap_SaleLeasebackTransactionDescriptionAxis=tdw_SaleLeasebackArrangementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: