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Note 14 - Asset Dispositions, Assets Held for Sale and Asset Impairments - Activity in Assets Held for Sale (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)
Beginning balance			8
Additions				1
Ending balance	1	8	1	8
Vessels Held for Sale [Member]
Beginning balance	2	9	8	18
Beginning balance	$ 630	$ 6,862	$ 4,195	$ 14,421
Additions	0	0	0	1
Additions	$ 0	$ 0	$ 0	$ 2,500
Sales	(1)	(1)	(7)	(10)
Sales	$ (65)	$ (47)	$ (3,630)	$ (8,606)
Ending balance	1	8	1	8
Ending balance	$ 565	$ 6,815	$ 565	$ 6,815
Transfers			0	(1)
Transfers			$ 0	$ (1,500)

X

- Definition

The amount of additions to assets held for sale during the period.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of sales of assets held for sale during the period.

+ References

No definition available.

+ Details

Name:	tdw_AssetsHeldForSaleSales
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The amount of increase (decrease) in assets held for sale from transfers.

+ References

No definition available.

+ Details

Name:	tdw_AssetsHeldForSaleTransfers
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

- Definition

The number of vessels are classified as held for sale during period.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsHeldForSaleAddition
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of vessels classified as held for sale are sold during period.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsHeldForSaleSold
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of increase (decrease) in vessels held for sale from transfers.

+ References

No definition available.

+ Details

Name:	tdw_NumberOfVesselsHeldForSaleTransfers
Namespace Prefix:	tdw_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of assets held-for-sale that are not part of a disposal group.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 15
-Paragraph 4
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482309/360-10-15-4

+ Details

Name:	us-gaap_AssetsHeldForSaleNotPartOfDisposalGroup
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleByAssetTypeAxis=tdw_VesselsHeldForSaleMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: