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Restaurant Acquisition (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Aug. 22, 2019
USD ($)
May 01, 2018
USD ($)
restaurant
Apr. 16, 2018
USD ($)
restaurant
Feb. 19, 2018
USD ($)
restaurant
Dec. 29, 2018
USD ($)
restaurant
Dec. 28, 2019
USD ($)
Dec. 29, 2018
USD ($)
restaurant
Dec. 30, 2017
USD ($)
Business Acquisition [Line Items]                
Business Combination, Consideration Transferred           $ 1,245 $ 6,516 $ 3,949
Working capital   $ 7 $ 20 $ 4        
Property and equipment $ 90 28 160 26        
Reacquired franchise rights 610 887 1,277 541        
Goodwill 533 1,309 458 1,331 $ 49,655 $ 50,188 $ 49,655 $ 46,557
Gift card liability   0 0 (2)        
Total purchase price 1,233 $ 2,231 $ 1,915 $ 1,900        
Series of Individually Immaterial Business Acquisitions [Member]                
Business Acquisition [Line Items]                
Number of Restaurants Acquired from a Franchisee | restaurant   1 1 1 3   3  
Business Combination, Consideration Transferred $ 1,200 $ 2,200 $ 1,900 $ 1,900 $ 500