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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: