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Acquisitions - Additional Information (Detail) - USD ($)
$ in Thousands
Oct. 26, 2020
Oct. 21, 2019
Dec. 10, 2018
Aug. 10, 2018
Jan. 02, 2021
Dec. 28, 2019
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, goodwill         $ 155,617 $ 157,916
Kurbo Health, Inc.            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, net purchase price       $ 3,063    
Business acquisition, purchase price allocation, goodwill       1,101    
Business acquisition, purchase price allocation, prepaid expenses       78    
Business acquisition, purchase price allocation, other assets       32    
Business acquisition, purchase price allocation, deferred revenue       57    
Business acquisition, purchase price allocation, other liabilities       7    
Weight Watchers of Arizona, Inc. and Weight Watchers Imperial County, Inc.,            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, net purchase price $ 10,000          
Business acquisition, net purchase price 10,037          
Business acquisition, assumed net assets 37          
Business acquisition, purchase price allocation, property plant and equipment 131          
Business acquisition, purchase price allocation, inventory 84          
Business acquisition, purchase price allocation, current assets, other 12          
Weight Watchers of Las Vegas, Inc.            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, net purchase price   $ 4,500        
Business acquisition, purchase price allocation, goodwill   4,111        
Business acquisition, net purchase price   4,060        
Business acquisition, cash acquired   385        
Business acquisition, assumed net liabilities   55        
South Carolina Acquisition            
Business Acquisition [Line Items]            
Business acquisition, net purchase price     $ 4,000      
Business acquisition, assumed net liabilities     37      
Website Development | Kurbo Health, Inc.            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, finite lived intangible assets       $ 1,916    
Franchise Rights | Weight Watchers of Arizona, Inc. and Weight Watchers Imperial County, Inc.,            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, indefinite lived intangible assets 9,546          
Franchise Rights | Weight Watchers of Las Vegas, Inc.            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, indefinite lived intangible assets   118        
Franchise Rights | South Carolina Acquisition            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, net purchase price     4,000      
Business acquisition, purchase price allocation, indefinite lived intangible assets     3,791      
Customer Relationships | Weight Watchers of Arizona, Inc. and Weight Watchers Imperial County, Inc.,            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, finite lived intangible assets $ 227          
Customer Relationships | Weight Watchers of Las Vegas, Inc.            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, finite lived intangible assets   $ 271        
Customer Relationships | South Carolina Acquisition            
Business Acquisition [Line Items]            
Business acquisition, purchase price allocation, finite lived intangible assets     $ 209