Document and Entity Information - shares	3 Months Ended
	Mar. 30, 2024	Apr. 25, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
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