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Schedule of Deferred Tax Not Recognized (Detail) $ in Thousands	12 Months Ended
	Mar. 31, 2017 USD ($)
Income Tax Disclosure [Abstract]
Foreign income not recognized for U.S. deferred taxes	$ 1,805,626

X

- Definition

Amount Of Foreign Earnings Not Currently Recognized For U.S. Taxation

+ References

No definition available.

+ Details

Name:	tdw_AmountOfForeignEarningsNotCurrentlyRecognizedForUSTaxation
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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