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Goodwill and Intangible Assets - Schedule of Goodwill (Details)
$ in Thousands
 9 Months Ended
Sep. 24, 2025
USD ($)
franchise
Goodwill [Roll Forward]  
Balance, beginning of year $ 66,357
Write-offs and reclassifications associated with the sale of Keke's units (392)
Balance, end of period 68,532
Total goodwill 68,532
Denny’s  
Goodwill [Roll Forward]  
Balance, beginning of year 37,507
Balance, end of period 37,917
Total goodwill 37,917
Other  
Goodwill [Roll Forward]  
Balance, beginning of year 28,850
Balance, end of period 30,615
Total goodwill $ 30,615
Keke's  
Goodwill [Line Items]  
Number of franchise units | franchise 5
Goodwill [Roll Forward]  
Addition related to the acquisition $ 2,157
Franchise Unit  
Goodwill [Roll Forward]  
Addition related to the acquisition $ 410