v3.25.2
Document and Entity Information - shares
6 Months Ended
Jun. 30, 2025
Jul. 29, 2025
Cover [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2025  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Trading Symbol WW  
Entity Registrant Name WW INTERNATIONAL, INC.  
Entity Central Index Key 0000105319  
Current Fiscal Year End Date --01-03  
Entity Filer Category Accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Common Stock, Shares Outstanding   9,986,928
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 18 West 18th Street  
Entity Address, Address Line Two 7th Floor  
Entity Address, City or Town New York  
Entity Address, State or Province NY  
Entity Address, Postal Zip Code 10011  
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  
Entity Bankruptcy Proceedings, Reporting Current true