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Introduction and Basis of Reporting - (Narrative) (Details) | 12 Months Ended |  |  |
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Dec. 29, 2021 restaurant country state territory | Dec. 30, 2020 restaurant | Dec. 25, 2019 restaurant | Dec. 26, 2018 restaurant
Franchisor Disclosure [Line Items] |  |  |  |
Number of states in which entity operates | state | 50 |  |  |
Number of territories in which entity operates | territory | 2 |  |  |
Number of foreign countries in which entity operates | country | 11 |  |  |
Number of restaurants | 1,640 | 1,650 | 1,703 |
Franchise |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |
Number of restaurants | 1,575 | 1,585 | 1,635 | 1,536
Company-owned restaurants |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |
Number of restaurants | 65 | 65 | 68 | 173
Geographic Concentration Risk | Geographic Area | California |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |
Percentage of restaurants operated by geographic region | 23.00% |  |  |
Geographic Concentration Risk | Geographic Area | Texas |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |
Percentage of restaurants operated by geographic region | 12.00% |  |  |
Geographic Concentration Risk | Geographic Area | Florida |  |  |  |
Franchisor Disclosure [Line Items] |  |  |  |
Percentage of restaurants operated by geographic region | 8.00% |  |  |

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