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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail)
 3 Months Ended 12 Months Ended
May 05, 2024
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May 07, 2023
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May 08, 2022
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Aug. 10, 2018
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Sep. 28, 2024
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Mar. 30, 2024
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Dec. 30, 2023
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Dec. 31, 2022
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Oct. 01, 2022
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Jul. 02, 2022
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Dec. 28, 2024
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Segment
Dec. 30, 2023
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Dec. 31, 2022
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Goodwill And Intangible Assets Disclosure [Line Items]                          
Accumulated goodwill impairment loss             $ 25,111,000       $ 25,111,000 $ 25,111,000  
Number of reportable segments | Segment                     1    
Number of operating segments | Segment                     1    
Net book value of goodwill             243,441,000 $ 155,998,000     $ 239,583,000 243,441,000 $ 155,998,000
Goodwill impairment $ 0 $ 0 $ 0   $ 0 $ 0           3,586,000  
Finite-lived intangible assets, aggregate amortization expense                     $ 33,596,000 $ 42,449,000 $ 33,676,000
Kurbo, Inc                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Goodwill impairment                   $ 1,101,000      
Kurbo Health, Inc                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Net purchase price       $ 3,063,000                  
Net book value of goodwill       $ 1,101,000                  
Behavioral Reporting Unit                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Percentage of goodwill held                     62.50%    
Net book value of goodwill                     $ 149,841,000    
Goodwill impairment         $ 0                
Behavioral Reporting Unit | Minimum                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Percentage of estimated fair value in excess of carrying amount         100.00%                
Clinical Reporting Unit                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Percentage of goodwill held                     37.50%    
Net book value of goodwill                     $ 89,742,000    
Goodwill impairment         $ 0                
Clinical Reporting Unit | Minimum                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Percentage of estimated fair value in excess of carrying amount         20.00%                
All Reporting Units | Minimum                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Percentage of estimated fair value in excess of carrying amount 30.00%         25.00%              
Republic of Ireland                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Goodwill impairment             2,383,000 2,023,000          
Northern Ireland                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Goodwill impairment             1,203,000            
Franchise Rights Acquired | Northern Ireland                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Finite-lived intangible assets, impairment charges             $ 47,000            
Impairment, Intangible Asset, Finite-Lived, Statement of Income or Comprehensive Income [Extensible Enumeration]             Franchise rights acquired and goodwill impairments            
Franchise Rights Acquired                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Indefinite-lived intangible assets, impairment charges $ 0 $ 0                      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments                      
Franchise Rights Acquired | Other Units of Account                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Indefinite-lived intangible assets, impairment charges     $ 0                    
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]     Franchise rights acquired and goodwill impairments                    
Franchise Rights Acquired | Australia                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Indefinite-lived intangible assets, impairment charges           $ 4,074,000   $ 1,872,000          
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]           Franchise rights acquired and goodwill impairments   Franchise rights acquired and goodwill impairments          
Percentage of franchise rights acquired held             1.10%         1.10%  
Net book value of franchise rights acquired             $ 4,232,000         $ 4,232,000  
Franchise Rights Acquired | United States                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Indefinite-lived intangible assets, impairment charges $ 0       $ 54,295,000 $ 251,431,000   $ 25,739,000 $ 298,291,000        
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Franchise rights acquired and goodwill impairments       Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments   Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments        
Percentage of franchise rights acquired held             97.60%       100.00% 97.60%  
Net book value of franchise rights acquired             $ 374,353,000       $ 68,627,000 $ 374,353,000  
Franchise Rights Acquired | United States | Minimum                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Percentage of estimated fair value in excess of carrying amount 5.00%                        
Franchise Rights Acquired | United Kingdom                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Indefinite-lived intangible assets, impairment charges $ 0       $ 2,750,000 $ 155,000   $ 8,275,000          
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] Franchise rights acquired and goodwill impairments       Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments   Franchise rights acquired and goodwill impairments          
Percentage of franchise rights acquired held             0.70%         0.70%  
Net book value of franchise rights acquired             $ 2,806,000         $ 2,806,000  
Franchise Rights Acquired | United Kingdom | Minimum                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Percentage of estimated fair value in excess of carrying amount 5.00%                        
Franchise Rights Acquired | Canada                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Indefinite-lived intangible assets, impairment charges               $ 19,657,000 $ 13,312,000 $ 24,485,000      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]               Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments      
Franchise Rights Acquired | New Zealand                          
Goodwill And Intangible Assets Disclosure [Line Items]                          
Indefinite-lived intangible assets, impairment charges           $ 2,328,000   $ 0 $ 1,138,000 $ 834,000      
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration]           Franchise rights acquired and goodwill impairments   Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments Franchise rights acquired and goodwill impairments      
Percentage of franchise rights acquired held             0.60%         0.60%  
Net book value of franchise rights acquired             $ 2,420,000         $ 2,420,000