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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 30, 2024 USD ($) Segment | Apr. 01, 2023 USD ($) | Dec. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Number of reportable segment | Segment | 1 |  |  |
Number of operating segment | Segment | 1 |  |  |
Finite-lived intangible assets, aggregate amortization expense | $ 9,290 | $ 8,519 |  |
Net book value of goodwill | $ 242,258 |  | $ 243,441 | $ 155,998
Franchise right maturity period | 7 years |  |  |
Behavioral Reporting Unit |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Net book value of goodwill | $ 152,516 |  |  |
Clinical Reporting Unit |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Net book value of goodwill | $ 89,742 |  |  |
All Reporting Units |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Percentage of estimated fair value in excess of carrying amount | 25.00% |  |  |
Franchise rights acquired | Maximum |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Finite-lived intangible assets, estimated useful life (in years) | 1 year |  |  |
Franchise rights acquired | United States |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Net book value of franchise rights acquired | $ 122,923 |  |  |
Indefinite-lived intangible assets, impairment charges | $ 251,431 |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] | Asset Impairment Charges |  |  |
Percentage of franchise rights acquired | 97.90% |  |  |
Franchise rights acquired | United Kingdom |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Net book value of franchise rights acquired | $ 2,628 |  |  |
Indefinite-lived intangible assets, impairment charges | $ 155 |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] | Asset Impairment Charges |  |  |
Percentage of franchise rights acquired | 2.10% |  |  |
Franchise rights acquired | Australia |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Indefinite-lived intangible assets, impairment charges | $ 4,074 |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] | Asset Impairment Charges |  |  |
Franchise rights acquired | New Zealand |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |
Indefinite-lived intangible assets, impairment charges | $ 2,328 |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] | Asset Impairment Charges |  |  |

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