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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 30, 2023
Dec. 31, 2022
Jan. 01, 2022
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Lease asset impairment charge   $ 2,680  
Net book value of franchise rights acquired $ 383,811 383,683  
Franchise right maturity period 7 years    
Net book value of goodwill $ 243,441 155,998 $ 157,374
Revenue, practical expedient, remaining performance obligation, description contracts with an original expected length of one year or less.    
Revenue, remaining performance obligation, optional exemption, performance obligation true    
Advertising expenses $ 235,227 238,978 252,754
Deferred financing costs, amortization expense $ 5,018 5,018 6,136
Minimum      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Equipment, estimated useful life (in years) 3 years    
Finite-lived intangible assets, estimated useful life (in years) 3 years    
Maximum      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Equipment, estimated useful life (in years) 10 years    
Finite-lived intangible assets, estimated useful life (in years) 20 years    
Property, Plant and Equipment      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Long-lived assets, impairment charges $ 212 61 516
Friendly-Physician Entities      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Percentage of equity interest of physician-owners 100.00%    
Internal Use Computer Software and Website Development Costs      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Long-lived assets, impairment charges $ 900 714 $ 5
Franchise Rights Acquired | Maximum      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Finite-lived intangible assets, estimated useful life (in years) 1 year    
Software and website development costs | Minimum      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Finite-lived intangible assets, estimated useful life (in years) 3 years    
Software and website development costs | Maximum      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Finite-lived intangible assets, estimated useful life (in years) 5 years    
United States      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of goodwill $ 104,019 $ 104,019  
Percentage of goodwill 42.70% 66.70%  
United States | Franchise Rights Acquired      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of franchise rights acquired $ 374,353 $ 374,353  
Percentage of franchise rights acquired 97.60% 97.60%  
Canada      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of goodwill $ 40,463 $ 39,547  
Percentage of goodwill 16.60% 25.30%  
United Kingdom | Franchise Rights Acquired      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of franchise rights acquired $ 2,806 $ 2,666  
Percentage of franchise rights acquired 0.70% 0.70%  
Australia | Franchise Rights Acquired      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of franchise rights acquired $ 4,232 $ 4,232  
Percentage of franchise rights acquired 1.10% 1.10%  
New Zealand | Franchise Rights Acquired      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of franchise rights acquired $ 2,420 $ 2,432  
Percentage of franchise rights acquired 0.60% 0.60%  
Other Countries      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of goodwill $ 9,217 $ 12,432  
Percentage of goodwill 3.80% 8.00%  
Sequence      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of goodwill $ 89,742