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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
May 07, 2023
May 08, 2022
Aug. 10, 2018
Sep. 30, 2023
Oct. 01, 2022
Jul. 02, 2022
Sep. 30, 2023
Oct. 01, 2022
Dec. 31, 2022
Jan. 01, 2022
Goodwill And Intangible Assets Disclosure [Line Items]                    
Finite-lived intangible assets, aggregate amortization expense       $ 13,628 $ 8,347   $ 32,590 $ 25,282    
Goodwill       244,927     244,927   $ 155,998 $ 157,374
Franchise right maturity period 7 years                  
Goodwill impairment $ 0 $ 0             $ 3,124  
Kurbo Health, Inc                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Goodwill     $ 1,101              
Net purchase price     $ 3,063              
Kurbo, Inc                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Goodwill impairment           $ 1,101        
United States                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Goodwill       104,020     104,020      
Canada                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Goodwill       39,541     39,541      
Other Countries                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Goodwill       $ 12,176     $ 12,176      
All Reporting Units Except for Republic of Ireland                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Percentage of goodwill held       99.10%     99.10%      
All Reporting Units Except for Republic of Ireland | Goodwill | Minimum                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Percentage of estimated fair value in excess of carrying amount 120.00%                  
Republic of Ireland                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Goodwill       $ 2,307     $ 2,307      
Percentage of estimated fair value in excess of carrying amount 55.00%                  
Percentage of goodwill held       0.90%     0.90%      
Franchise Rights Acquired                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Asset Impairment Charges                  
Indefinite-lived intangible assets, impairment charges $ 0                  
Assumed cumulative annual revenue growth rate 2.80%                  
Franchise Rights Acquired | Maximum                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Finite-lived intangible assets, estimated useful life (in years)       1 year     1 year      
Assumed Workshops + Digital revenue growth rate (18.40%)                  
Assumed operating income margin rates 12.70%                  
Assumed Digital revenue growth rate 7.50%                  
Franchise Rights Acquired | Minimum                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Assumed Workshops + Digital revenue growth rate (37.10%)                  
Assumed operating income margin rates (6.40%)                  
Assumed Digital revenue growth rate (14.80%)                  
Franchise Rights Acquired | Other Units of Account                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]   Asset Impairment Charges                
Indefinite-lived intangible assets, impairment charges   $ 0                
Franchise Rights Acquired | United States                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Net book value of franchise rights acquired       $ 374,354     $ 374,354      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]         Asset Impairment Charges          
Indefinite-lived intangible assets, impairment charges         $ 298,291          
Franchise Rights Acquired | Canada                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]         Asset Impairment Charges Asset Impairment Charges        
Indefinite-lived intangible assets, impairment charges         $ 13,312 $ 24,485        
Franchise Rights Acquired | United Kingdom                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Net book value of franchise rights acquired       2,688     2,688      
Franchise Rights Acquired | Australia                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Net book value of franchise rights acquired       3,995     3,995      
Franchise Rights Acquired | New Zealand                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Net book value of franchise rights acquired       $ 2,295     $ 2,295      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]         Asset Impairment Charges Asset Impairment Charges        
Indefinite-lived intangible assets, impairment charges         $ 1,138 $ 834        
Percentage of estimated fair value in excess of carrying amount 20.00%                  
Percentage of franchise rights acquired       0.60%     0.60%      
Franchise Rights Acquired | All Units of Account Except For New Zealand                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Percentage of franchise rights acquired       99.40%     99.40%      
Franchise Rights Acquired | All Units of Account Except For New Zealand | Minimum                    
Goodwill And Intangible Assets Disclosure [Line Items]                    
Percentage of estimated fair value in excess of carrying amount 70.00%