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Document and Entity Information
Jun. 23, 2025
Document And Entity Information [Line Items]  
Document Type 8-K
Document Period End Date Jun. 23, 2025
Entity Registrant Name WW INTERNATIONAL, INC.
Entity Incorporation State Country Code VA
Entity File Number 001-16769
Entity Tax Identification Number 11-6040273
Entity Address Address Line 1 18 West 18th Street
Entity Address Address Line 2 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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, no par value
Trading Symbol WGHTQ
Security Exchange Name NONE
Entity Emerging Growth Company false
Current Fiscal Year End Date --01-03
Entity Central Index Key 0000105319
Amendment Flag false
Former Address [Member]  
Document And Entity Information [Line Items]  
Entity Address Address Line 1 675 Avenue of the Americas
Entity Address Address Line 2 6th Floor
Entity Address City Or Town New York
Entity Address State Or Province NY
Entity Address Postal Zip Code 10010