Revenue Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 11, 2021	Apr. 12, 2020	Apr. 11, 2021	Apr. 12, 2020
Disaggregation of Revenue [Line Items]
Initial franchise fee			$ 50,000
Royalty and marketing fee, percent of gross sales			5.00%
Revenues	$ 257,217,000	$ 216,157,000	$ 595,758,000	$ 523,830,000
Company Restaurant Sales
Disaggregation of Revenue [Line Items]
Revenues	85,962,000	74,380,000	200,240,000	179,744,000
Franchise Rental Revenues
Disaggregation of Revenue [Line Items]
Revenues	77,901,000	69,885,000	181,650,000	165,969,000
Franchise Royalties
Disaggregation of Revenue [Line Items]
Revenues	43,620,000	36,049,000	100,963,000	86,292,000
Marketing Fees
Disaggregation of Revenue [Line Items]
Revenues	42,317,000	30,550,000	98,093,000	79,385,000
Technology and Sourcing Fees
Disaggregation of Revenue [Line Items]
Revenues	3,806,000	3,578,000	8,896,000	8,502,000
Franchise Fees and Other Services
Disaggregation of Revenue [Line Items]
Revenues	$ 3,611,000	$ 1,715,000	$ 5,916,000	$ 3,938,000