Schedule of Deferred Tax Not Recognized (Detail) $ in Thousands	12 Months Ended
Mar. 31, 2016 USD ($)
Income Tax Disclosure [Abstract]
Foreign income not recognized for U.S. deferred taxes	$ 2,439,297

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

No definition available.

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