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Note 11 - Properties and Equipment, Accrued Expenses, Other Current Liabilities, and Other Liabilities (Details Textual) € in Millions, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2024 EUR (€) | Dec. 31, 2023
Number of Vessels | 213 | 213 | 217
Alucat Crew Boats [Member] |  |  |
Number of Vessels | 6 | 6 |
Down Payment To Start Construction On Crew Boats | $ 2.9 | € 2.7 |
Expected Cost of Boats | $ 12.0 | € 10.7 |

X
- Definition Represents down payments to start construction on crew boats + References No definition available. + Details
Name: | tdw_DownPaymentToStartConstructionOnCrewBoats
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The expected cost of Alucat crew boats + References No definition available. + Details
Name: | tdw_ExpectedCostOfBoats
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of vessels. + References No definition available. + Details
Name: | tdw_NumberOfVessels
Namespace Prefix: | tdw_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=tdw_AlucatCrewBoatsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |