Note 15 - Restructuring Charges (Details Textual) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Business Exit Costs And Severance Charges	$ 5.7	$ 0.2	$ 1.5

Represents the business exit costs and severance charges.

No definition available.

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