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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) |

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