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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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% |

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