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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