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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
May 05, 2024 USD ($) | Mar. 30, 2024 USD ($) | May 07, 2023 USD ($) | Jun. 29, 2024 USD ($) | Mar. 30, 2024 USD ($) | Jul. 01, 2023 USD ($) | Jun. 29, 2024 USD ($) Segment | Jul. 01, 2023 USD ($) | Dec. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Number of reportable segments | Segment |  |  |  |  |  |  | 1 |  |  |
Number of operating segments | Segment |  |  |  |  |  |  | 1 |  |  |
Finite-lived intangible assets, aggregate amortization expense |  |  |  | $ 8,472,000 |  | $ 10,443,000 | $ 17,762,000 | $ 18,962,000 |  |
Goodwill impairment | $ 0 | $ 0 | $ 0 |  |  |  |  |  | $ 3,586,000 |
Net book value of goodwill |  |  |  | 241,872,000 |  |  | $ 241,872,000 |  | $ 243,441,000 | $ 155,998,000
Franchise right maturity period |  |  |  |  |  |  | 7 years |  |  |
Behavioral Reporting Unit |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of goodwill |  |  |  | 152,130,000 |  |  | $ 152,130,000 |  |  |
Clinical Reporting Unit |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of goodwill |  |  |  | $ 89,742,000 |  |  | $ 89,742,000 |  |  |
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% |  |  | 25.00% |  |  |  |  |
Franchise rights acquired |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets, impairment charges | $ 0 |  | $ 0 |  |  |  |  |  |  |
Franchise rights acquired | Maximum |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, estimated useful life (in years) |  |  |  | 1 year |  |  | 1 year |  |  |
Franchise rights acquired | United States |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | $ 122,922,000 |  |  | $ 122,922,000 |  |  |
Indefinite-lived intangible assets, impairment charges |  |  |  |  | $ 251,431,000 |  |  |  |  |
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% |  |  | 97.90% |  |  |
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% |  |  | 5.00% |  |  |
Franchise rights acquired | United Kingdom |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | $ 2,632,000 |  |  | $ 2,632,000 |  |  |
Indefinite-lived intangible assets, impairment charges |  |  |  |  | $ 155,000 |  |  |  |  |
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% |  |  | 2.10% |  |  |
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% |  |  | 5.00% |  |  |
Franchise rights acquired | Australia |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets, impairment charges |  |  |  |  | $ 4,074,000 |  |  |  |  |
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 |  |  |  |  | $ 2,328,000 |  |  |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  | Asset Impairment Charges |  |  |  |  |

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