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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