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Summary of Refranchisings and Franchise Acquisitions (Narrative) (Details) $ in Thousands | 12 Months Ended
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Sep. 29, 2024 USD ($) restaurant | Oct. 01, 2023 USD ($) restaurant | Oct. 02, 2022 USD ($) restaurant
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |
Number of restaurants acquired from franchisees | restaurant |  | 0 | 13
Gains on acquisition of restaurants | $ 2,702 | $ 0 | $ 0
Del Taco |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |
Number of restaurants acquired from franchisees | restaurant | 10 | 0 | 0
Franchise Acquisitions |  |  |
Summary Of Refranchisings, Franchisee Development And Acquisitions [Line Items] |  |  |
Gains on acquisition of restaurants | $ 2,700 |  |
Receivables eliminated in acquisition accounting |  |  | $ 300

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