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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
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The expected cost of Alucat crew boats + References No definition available. + Details
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Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The number of vessels. + References No definition available. + Details
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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
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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: |