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Goodwill and Intangible Assets - (Goodwill) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 27, 2023 | Dec. 28, 2022 | Dec. 29, 2021 | Jul. 20, 2022
Goodwill [Roll Forward] |  |  |  |
Balance, beginning of year | $ 72,740 | $ 36,884 |  |
Reclassifications to assets held for sale | (469) | 0 |  |
Impairment charges related to Keke’s | (6,363) | 0 | $ 0 |
Balance, end of year | 65,908 | 72,740 | 36,884 |
Goodwill | 65,908 | 72,740 | $ 36,884 |
Accumulated impairment losses | 6,400 |  |  |
Denny’s |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance, beginning of year | 37,527 |  |  |
Balance, end of year | 37,527 | 37,527 |  |
Goodwill | 37,527 | 37,527 |  |
Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Balance, beginning of year | 35,213 |  |  |
Balance, end of year | 28,381 | 35,213 |  |
Goodwill | 28,381 | 35,213 |  |
Keke's |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Addition related to the acquisition | 0 | 35,213 |  |
Goodwill |  |  |  | $ 35,213
Franchise Unit |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Addition related to the acquisition | $ 0 | $ 643 |  |

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