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System Optimization Gains, Net Summary of Disposition Activity (Details)
$ in Thousands
3 Months Ended
Mar. 29, 2020
USD ($)
number_of_restaurants
Mar. 31, 2019
USD ($)
number_of_restaurants
Dec. 29, 2019
number_of_restaurants
Jan. 01, 2017
System optimization gains, net        
Company-operated restaurant ownership percentage       5.00%
Number of restaurants classified as assets held for sale | number_of_restaurants 43   0  
System optimization gains, net $ 323 $ 12    
Proceeds from sales $ 195 $ 0    
Sale of franchise-operated restaurant to franchisee        
System optimization gains, net        
Significant Changes, Franchises Sold | number_of_restaurants 3 0    
Sale of Company-operated restaurants to franchisees        
System optimization gains, net        
Post closing adjustments on sales of restaurants $ 345 $ (8)    
Sale of other assets        
System optimization gains, net        
System optimization gains, net (22) $ 20    
Proceeds from sales $ 195