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Note 14 - Asset Dispositions, Assets Held for Sale and Asset Impairments (Details Textual) $ in Millions	3 Months Ended	6 Months Ended
	Mar. 31, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Dec. 31, 2022
Number Of Vessels Sold Or Scrapped		6	9
Number of Vessels, Held for Sale		2	9	8
Asset Held For Sale, Net Book Value		$ 0.6	$ 6.9
Proceeds from Sale of Vessels		8.7
Gain (Loss) on Sale of Assets and Asset Impairment Charges		$ 3.6
Number of Vessels, Held for Sale, Addition			1
Number of Vessels, Transfer from Held for Sale to Active Fleet			1
Impairment Charge Recaptured	$ 0.5
Vessels, Active Fleet [Member]
Number Of Vessels Sold Or Scrapped		2

X

- Definition

Represents assets held for sale at net book value.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of impairment charge recaptured during period.

+ References

No definition available.

+ Details

Name:	tdw_ImpairmentChargeRecaptured
Namespace Prefix:	tdw_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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

Represents the number of vessels sold or scrapped.

+ References

No definition available.

+ Details

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

X

- Definition

The number of vessels transferred from held for sale to active fleet during period.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of cash inflow from the sale of vessels.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of gain (loss) from the difference between the sale price or salvage price and the book value of an asset that was sold or retired, and gain (loss) from the write down of assets from their carrying value to fair value.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

+ Details

Name:	us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=tdw_VesselsActiveFleetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: