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Note 6 - Stockholders' Equity and Dilutive Equity Instruments - Dilutive Equity Instruments (Details) (Parentheticals) - $ / shares	Sep. 30, 2023	Sep. 30, 2022
New Creditor Warrants [Member]
Strike price per common share (in dollars per share)	$ 0.001	$ 0.001
GulfMark Creditor Warrants [Member]
Strike price per common share (in dollars per share)	0.01	0.01
SPO Acquisition Warrants [Member]
Strike price per common share (in dollars per share)	$ 0.001	$ 0.001

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=tdw_NewCreditorWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=tdw_GulfmarkCreditorWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=tdw_SpoAcquisitionWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: