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Refranchisings and Acquisitions - (Narrative) (Details)
$ in Thousands
12 Months Ended
Dec. 30, 2020
USD ($)
restaurant
real_estate
Dec. 25, 2019
USD ($)
real_estate
restaurant
Dec. 26, 2018
USD ($)
restaurant
Franchisor Disclosure [Line Items]      
Noncash consideration $ 0 $ 3,000 $ 0
Assets held for sale $ 1,125 $ 1,925  
Number of restaurants | restaurant 1,650 1,703 1,709
Held-for-sale      
Franchisor Disclosure [Line Items]      
Assets held for sale $ 1,100 $ 1,900  
Assets held for sale, property 1,000 1,600  
Other assets held for sale $ 100 $ 200  
Number of real estate properties | real_estate 2 2  
Number of restaurants | restaurant   4  
Assets held for sale, goodwill   $ 100  
Real Estate      
Franchisor Disclosure [Line Items]      
Noncash consideration $ 0 3,000 $ 0
Real Estate | Other Noncurrent Assets      
Franchisor Disclosure [Line Items]      
Noncash consideration $ 3,000 $ 3,000