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Acquisitions (Details)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 29, 2020
USD ($)
restaurant
Dec. 31, 2019
USD ($)
Dec. 31, 2019
USD ($)
restaurant
Acquisitions      
Number of restaurants acquired | restaurant 2    
Purchase price paid $ 10.6    
Goodwill deductible for tax purposes 3.3    
Reacquired franchise rights      
Acquisitions      
Finite-lived Intangible Assets Acquired $ 1.6    
Weighted-average life 3 years 4 months 24 days    
One Franchise Restaurant In Georgia      
Acquisitions      
Number of restaurants acquired | restaurant     1
Purchase price paid   $ 1.5  
Goodwill deductible for tax purposes   $ 1.5 $ 1.5