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Document and Entity Information
 9 Months Ended
Sep. 29, 2019
Cover [Abstract]  
Current Fiscal Year End Date --12-28
Amendment Flag false
Entity Central Index Key 0000105319
Document Type 8-K
Document Period End Date Sep. 29, 2019
Entity Registrant Name WW INTERNATIONAL, INC.
Entity Incorporation, State or Country Code VA
Entity File Number 001-16769
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
Entity Information, Former Legal or Registered Name Weight Watchers International, Inc.
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock
Trading Symbol WW
Security Exchange Name NASDAQ
Entity Emerging Growth Company false