Revenue Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 04, 2021	Jul. 05, 2020	Jul. 04, 2021	Jul. 05, 2020
Disaggregation of Revenue [Line Items]
Initial franchise fee			$ 50,000
Royalty and marketing fee, percent of gross sales			5.00%
Revenues	$ 269,458,000	$ 242,275,000	$ 865,216,000	$ 766,105,000
Company Restaurant Sales
Disaggregation of Revenue [Line Items]
Revenues	91,892,000	82,444,000	292,132,000	262,188,000
Franchise Rental Revenues
Disaggregation of Revenue [Line Items]
Revenues	80,598,000	76,021,000	262,248,000	241,990,000
Franchise Royalties
Disaggregation of Revenue [Line Items]
Revenues	45,950,000	41,537,000	146,913,000	127,829,000
Marketing Fees
Disaggregation of Revenue [Line Items]
Revenues	44,305,000	36,757,000	142,398,000	116,142,000
Technology and Sourcing Fees
Disaggregation of Revenue [Line Items]
Revenues	4,081,000	3,814,000	12,977,000	12,316,000
Franchise Fees and Other Services
Disaggregation of Revenue [Line Items]
Revenues	$ 2,632,000	$ 1,702,000	$ 8,548,000	$ 5,640,000