Document and Entity Information - shares	3 Months Ended
	Mar. 30, 2024	Apr. 25, 2024
Cover [Abstract]
Document Type	10-Q/A
Amendment Flag	true
Amendment Description	This Amendment No. 1 on Form 10-Q/A (the “Amendment”) amends the Quarterly Report on Form 10-Q of WW International, Inc. (the “Company”) for the fiscal quarter ended March 30, 2024, as filed with the Securities and Exchange Commission on May 2, 2024 (the “Original Filing”). This Amendment is being filed solely to correct the Company’s Clinical End of Period Subscribers, Total End of Period Subscribers, Clinical Paid Weeks, and Total Paid Weeks for the fiscal quarter ended March 30, 2024 and related percentage changes versus the prior year period, as applicable, as presented in the “Metrics and Business Trends” subsection on page 35 of “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations” of the Original Filing. No other information in the Original Filing, including revenues, was incorrectly presented, and this Amendment should be read in conjunction with the Original Filing. In accordance with Rule 12b-15 of the Securities Exchange Act of 1934, as amended, this Amendment includes new certifications required by Section 302 of the Sarbanes-Oxley Act of 2002, as amended, dated as of the filing date of this Amendment. Other than as expressly described above, no changes have been made to the Original Filing. This Amendment does not reflect events occurring after the Original Filing.
Document Period End Date	Mar. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q1
Trading Symbol	WW
Entity Registrant Name	WW INTERNATIONAL, INC.
Entity Central Index Key	0000105319
Current Fiscal Year End Date	--12-28
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		79,274,672
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	001-16769
Entity Incorporation, State or Country Code	VA
Entity Tax Identification Number	11-6040273
Entity Address, Address Line One	675 Avenue of the Americas
Entity Address, Address Line Two	6th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10010
City Area Code	212
Local Phone Number	589-2700
Title of 12(b) Security	Common Stock, no par value
Security Exchange Name	NASDAQ
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false