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Franchise Rights Acquired, Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 03, 2020 | May 05, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Sep. 26, 2020 | Sep. 28, 2019 | Jan. 02, 2021 | Dec. 28, 2019
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 152,791,000 |  | $ 152,791,000 |  |  | $ 157,916,000
Goodwill impairment |  |  | 0 | $ 0 | 3,665,000 | $ 0 |  |
Finite-lived intangible assets, aggregate amortization expense |  |  | $ 7,557,000 | $ 6,973,000 | $ 22,108,000 | $ 22,014,000 |  |
Goodwill |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Reporting unit, percentage of estimated fair value in excess of carrying amount |  |  | 100.00% |  | 100.00% |  |  |
Franchise Rights |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Indefinite-lived intangible assets, impairment charges | $ 0 | $ 0 |  |  |  |  |  |
Reporting units percentage of rights acquired |  |  | 92.20% |  | 92.20% |  |  |
Scenario, Forecast |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Franchise right maturity period |  |  |  |  |  |  | 7 years |
United States |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Netbook value |  |  |  |  | $ 671,914,000 |  |  |
Goodwill |  |  | $ 102,968,000 |  | 102,968,000 |  |  |
Canada |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Netbook value |  |  |  |  | 53,915,000 |  |  |
Goodwill |  |  | $ 40,040,000 |  | $ 40,040,000 |  |  |
Canada | Franchise Rights |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Reporting units percentage of rights acquired |  |  | 7.20% |  | 7.20% |  |  |
Reporting unit, percentage of estimated fair value in excess of carrying amount |  |  | 16.50% |  | 16.50% |  |  |
United Kingdom |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Netbook value |  |  |  |  | $ 11,483,000 |  |  |
Australia |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Netbook value |  |  |  |  | 6,316,000 |  |  |
New Zealand |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Netbook value |  |  |  |  | 4,633,000 |  |  |
New Zealand | Franchise Rights |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Netbook value |  |  |  |  | $ 4,633,000 |  |  |
Reporting units percentage of rights acquired |  |  | 0.60% |  | 0.60% |  |  |
Reporting unit, percentage of estimated fair value in excess of carrying amount |  |  | 9.80% |  | 9.80% |  |  |
Other Countries |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Goodwill |  |  | $ 9,783,000 |  | $ 9,783,000 |  |  |
Brazil |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment |  |  |  |  | $ 3,665,000 |  |  |
Minimum | Franchise Rights |  |  |  |  |  |  |  |
Goodwill And Intangible Assets Disclosure [Line Items] |  |  |  |  |  |  |  |
Reporting unit, percentage of estimated fair value in excess of carrying amount |  |  | 35.00% |  | 35.00% |  |  |
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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