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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Leases, Practical Expedient, Description The Company has elected the short-term lease exception accounting policy, whereby the recognition requirements of the updated guidance is not applied and lease expense is recorded on a straight-line basis with respect to leases with an initial term of 12 months or less.    
Lease asset impairment charge     $ 2,680
Franchise rights maturity period 7 years    
Net book value of goodwill $ 239,583 $ 243,441 155,998
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 $ 234,316 235,227 238,978
Deferred financing costs, amortization expense 5,018 5,018 5,018
Allowance for credit write offs $ 15,080 1,241  
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 and Equipment      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Long-lived assets, impairment charges $ 339 212 61
Friendly-Physician Entities      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Percentage of equity interest of physician-owners 100.00%    
Behavioral Reporting Unit      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of goodwill $ 149,841    
Percentage of goodwill held 62.50%    
Clinical Reporting Unit      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of goodwill $ 89,742    
Percentage of goodwill held 37.50%    
Internal Use Computer Software and Website Development Costs      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Long-lived assets, impairment charges $ 142 900 $ 714
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    
Internal Use Computer 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    
Internal Use Computer 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 | Franchise Rights Acquired      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of franchise rights acquired $ 68,627 $ 374,353  
Percentage of franchise rights acquired held 100.00% 97.60%  
United Kingdom | Franchise Rights Acquired      
Organization And Summary Of Significant Accounting Policies Disclosure [Line Items]      
Net book value of franchise rights acquired   $ 2,806  
Percentage of franchise rights acquired held   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  
Percentage of franchise rights acquired held   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  
Percentage of franchise rights acquired held   0.60%