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Related Party Transactions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
restaurant
Sep. 24, 2024
USD ($)
restaurant
Sep. 30, 2025
USD ($)
restaurant
Sep. 24, 2024
USD ($)
restaurant
Franchise        
Related Party Transactions        
Number of restaurants 104 115 104 115
Officers, directors and shareholders | Majority-owned        
Related Party Transactions        
Number of restaurants 1 1 1 1
Officers, directors and shareholders | Franchise        
Related Party Transactions        
Number of restaurants 5 5 5 5
Royalties and fees received from franchise and license restaurants | $ $ 0.6 $ 0.6 $ 1.9 $ 1.8