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Summary of Refranchisings and Franchise Acquisition (Purchase Price Allocations on Franchise Acquisitions) (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 28, 2025
USD ($)
Jul. 06, 2025
USD ($)
Sep. 28, 2025
USD ($)
restaurant
Sep. 29, 2024
USD ($)
restaurant
Oct. 01, 2023
USD ($)
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]          
Closing and acquisition costs     $ 0 $ 31  
Property and equipment     (5,010) (3,945)  
Intangible assets     (165) (167)  
Operating lease right-of-use assets     (9,299) (3,479)  
Operating lease liability     13,607 4,772  
Goodwill recorded on franchise acquisition   6,326    
Gains on acquisition of restaurants     $ (6) $ (2,702) $ 0
Del Taco          
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]          
Restaurants acquired from Del Taco franchisees | restaurant     18 10  
Goodwill recorded on franchise acquisition $ 6,300 $ 6,300 $ 6,326    
Del Taco          
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items]          
Purchase price     7,193 $ 86  
Goodwill recorded on franchise acquisition     6,326 0  
Gains on acquisition of restaurants     $ (6) $ (2,702)