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Impairment and Closure Costs (Details)
$ in Thousands
12 Months Ended
Dec. 29, 2020
USD ($)
restaurant
Dec. 31, 2019
USD ($)
Dec. 25, 2018
USD ($)
Impairment and Closure Costs      
Impairment and closure, net $ 2,263 $ (899) $ 278
Impairment of goodwill 1,076 0 $ 0
Gain related to the leasehold improvements   1,200  
Operating lease right-of-use assets, Loss   (1,400)  
Costs associated with the relocation of restaurants   600  
Impairment And Closures, Four Restaurants [Member]      
Impairment and Closure Costs      
Asset Impairment Charges $ 1,200    
Number Of Restaurants Related | restaurant 4    
Impairment And Closures, Two Restaurants [Member]      
Impairment and Closure Costs      
Impairment of goodwill $ 1,100    
Number Of Restaurants Related | restaurant 2    
Impairment And Closures, One Restaurants [Member]      
Impairment and Closure Costs      
Number Of Restaurants Related | restaurant 1    
Gain related to the forced relocation   2,600  
Impairment And Closures, One Underperforming Restaurants [Member]      
Impairment and Closure Costs      
Operating lease right-of-use assets, Loss   $ 1,100