Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2022	Jul. 31, 2022
Document Information [Line Items]
Entity Central Index Key	0000098222
Entity Registrant Name	TIDEWATER INC
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2022
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	1-6311
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	72-0487776
Entity Address, Address Line One	842 West Sam Houston Parkway North, Suite 400
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77024
City Area Code	713
Local Phone Number	470-5300
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		42,065,813
Warrants to Purchase Shares of Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Warrants to purchase shares of common stock
Trading Symbol	TDW.WS
Security Exchange Name	NYSEAMER
Series B Warrants [Member]
Document Information [Line Items]
Title of 12(b) Security	Series B Warrants to purchase shares of common stock
Trading Symbol	TDW.WS.B
Security Exchange Name	NYSE
Series A Warrants [Member]
Document Information [Line Items]
Title of 12(b) Security	Series A Warrants to purchase shares of common stock
Trading Symbol	TDW.WS.A
Security Exchange Name	NYSE
Common Stock [Member]
Document Information [Line Items]
Title of 12(b) Security	Common stock, $0.001 par value per share
Trading Symbol	TDW
Security Exchange Name	NYSE