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Note 12 - Properties and Equipment, Accrued Expenses, Other Current Liabilities, and Other Liabilities (Details Textual) € in Millions, $ in Millions	9 Months Ended		12 Months Ended
	Oct. 01, 2023 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 EUR (€)	Sep. 30, 2022
Number of Vessels		219	183
Number of Vessels, Held for Sale		1	8	8
Alucat Crew Boats [Member]
Number of Vessels		5
Down Payment To Start Construction On Crew Boats		$ 2.9	€ 2.6
Expected cost of Boats	$ 11.1		€ 10.5

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_ExpectedCostOfAlucatCrewBoats
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

- Definition

The number of vessels classified as held for sale.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsHeldForSale
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: