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Business Summary and Basis of Presentation (Details)
9 Months Ended
Sep. 28, 2021
segment
restaurant
state
Franchisor Disclosure [Line Items]  
Number of restaurants 450
Number of states with operations | state 29
Number of operating segments | segment 1
Number of reportable segments | segment 1
Company-owned  
Franchisor Disclosure [Line Items]  
Number of restaurants 374
Franchise  
Franchisor Disclosure [Line Items]  
Number of restaurants 76