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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) |  |  |  |  | 3 Months Ended | 12 Months Ended
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May 05, 2024 USD ($) | May 07, 2023 USD ($) | May 08, 2022 USD ($) | Aug. 10, 2018 USD ($) | Sep. 28, 2024 USD ($) | Mar. 30, 2024 USD ($) | Dec. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Oct. 01, 2022 USD ($) | Jul. 02, 2022 USD ($) | Dec. 28, 2024 USD ($) Segment | Dec. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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 |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 40 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482640/350-30-55-40 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482665/350-30-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482686/350-30-45-2 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 8 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 7 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-7 + Details
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