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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 08, 2022 | May 09, 2021 | Aug. 10, 2018 | Oct. 01, 2022 | Jul. 02, 2022 | Oct. 02, 2021 | Oct. 01, 2022 | Oct. 02, 2021 | Jan. 01, 2022 | Jan. 02, 2021
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Franchise right maturity period |  |  |  |  |  |  | 7 years |  |  |
Net book value of goodwill |  |  |  | $ 156,155,000 |  |  | $ 156,155,000 |  | $ 157,374,000 | $ 155,617,000
Goodwill impairment | $ 0 | $ 0 |  |  |  |  | 1,101,000 |  |  |
Finite-lived intangible assets, aggregate amortization expense |  |  |  | 8,347,000 |  | $ 8,032,000 | 25,282,000 | $ 24,066,000 |  |
Kurbo Health, Inc |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of goodwill |  |  | $ 1,101,000 |  |  |  |  |  |  |
Net purchase price |  |  | $ 3,063,000 |  |  |  |  |  |  |
Kurbo, Inc |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  | $ 1,101,000 |  |  |  |  |
Franchise Rights |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets, impairment charges |  | $ 0 |  |  |  |  |  |  |  |
Franchise Rights | Other Units of Account |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Indefinite-lived intangible assets, impairment charges | $ 0 |  |  |  |  |  |  |  |  |
United States |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of goodwill |  |  |  | 104,019,000 |  |  | 104,019,000 |  |  |
United States | Franchise Rights |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | 400,092,000 |  |  | 400,092,000 |  |  |
Indefinite-lived intangible assets, impairment charges |  |  |  | 298,291,000 |  |  |  |  |  |
Percentage of estimated fair value in excess of carrying amount | 15.00% |  |  |  |  |  |  |  |  |
Canada |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of goodwill |  |  |  | 38,759,000 |  |  | 38,759,000 |  |  |
Canada | Franchise Rights |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | 19,342,000 |  |  | 19,342,000 |  |  |
Indefinite-lived intangible assets, impairment charges |  |  |  | 13,312,000 | 24,485,000 |  |  |  |  |
United Kingdom | Franchise Rights |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | 10,061,000 |  |  | 10,061,000 |  |  |
Australia | Franchise Rights |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | 5,753,000 |  |  | 5,753,000 |  |  |
New Zealand | Franchise Rights |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | 2,141,000 |  |  | 2,141,000 |  |  |
Indefinite-lived intangible assets, impairment charges |  |  |  | 1,138,000 | $ 834,000 |  |  |  |  |
Other Countries |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of goodwill |  |  |  | $ 13,377,000 |  |  | $ 13,377,000 |  |  |
All Reporting Units Except for Republic of Ireland |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of goodwill held |  |  |  | 97.40% |  |  | 97.40% |  |  |
Republic of Ireland |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of goodwill |  |  |  | $ 4,009,000 |  |  | $ 4,009,000 |  |  |
Percentage of goodwill held |  |  |  | 2.60% |  |  | 2.60% |  |  |
Percentage of estimated fair value in excess of carrying amount | 14.00% |  |  |  |  |  |  |  |  |
Minimum | Franchise Rights | Other Units of Account |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of estimated fair value in excess of carrying amount | 100.00% |  |  |  |  |  |  |  |  |
Minimum | All Reporting Units Except for Republic of Ireland | Goodwill |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of estimated fair value in excess of carrying amount | 35.00% |  |  |  |  |  |  |  |  |
Franchise Rights | Other Units of Account |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of franchise rights acquired |  |  |  |  | 2.20% |  |  |  |  |
Franchise Rights | United States |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | $ 400,092,000 | $ 698,383,000 |  | $ 400,092,000 |  |  |
Percentage of estimated fair value equal to carrying amount |  |  |  | 91.50% | 92.70% |  | 91.50% |  |  |
Franchise Rights | Canada |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | $ 19,342,000 | $ 34,556,000 |  | $ 19,342,000 |  |  |
Percentage of estimated fair value equal to carrying amount |  |  |  | 4.40% | 4.60% |  | 4.40% |  |  |
Franchise Rights | New Zealand |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Net book value of franchise rights acquired |  |  |  | $ 2,141,000 | $ 3,574,000 |  | $ 2,141,000 |  |  |
Percentage of estimated fair value equal to carrying amount |  |  |  | 0.50% | 0.50% |  | 0.50% |  |  |
Franchise Rights | Maximum |  |  |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Finite-lived intangible assets, estimated useful life (in years) |  |  |  |  |  |  | 1 year |  |  |

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