Summary of Refranchisings and Franchise Acquisitions (Narrative) (Details) $ in Thousands	12 Months Ended
	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