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Note 15 - Restructuring Charges (Details Textual) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019
Business Exit Costs And Severance Charges	$ 7.3	$ 1.5	$ 6.8

X

- Definition

Represents the business exit costs and severance charges.

+ References

No definition available.

+ Details

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