Revenue Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		9 Months Ended
	Jul. 05, 2020	Jul. 07, 2019	Jul. 05, 2020	Jul. 07, 2019
Disaggregation of Revenue [Line Items]
Initial franchise fee			$ 50,000
Royalty and marketing fee, percent of gross sales			5.00%
Revenues	$ 242,275,000	$ 222,359,000	$ 766,105,000	$ 728,872,000
Company Restaurant Sales
Disaggregation of Revenue [Line Items]
Revenues	82,444,000	78,434,000	262,188,000	257,948,000
Franchise Rental Revenues
Disaggregation of Revenue [Line Items]
Revenues	76,021,000	63,359,000	241,990,000	208,895,000
Franchise rental revenues	76,021,000	63,359,000	241,990,000	208,895,000
Franchise Royalties
Disaggregation of Revenue [Line Items]
Revenues	41,537,000	38,752,000	127,829,000	125,407,000
Marketing Fees
Disaggregation of Revenue [Line Items]
Revenues	36,757,000	37,269,000	116,142,000	121,078,000
Technology and Sourcing Fees
Disaggregation of Revenue [Line Items]
Revenues	3,814,000	3,117,000	12,316,000	10,111,000
Franchise Fees and Other Services
Disaggregation of Revenue [Line Items]
Revenues	$ 1,702,000	$ 1,428,000	$ 5,640,000	$ 5,433,000