Revenue Disaggregation of Revenue (Details) - USD ($)	3 Months Ended		6 Months Ended
	Apr. 12, 2020	Apr. 14, 2019	Apr. 12, 2020	Apr. 14, 2019
Disaggregation of Revenue [Line Items]
Initial franchise fee			$ 50,000
Royalty and marketing fee, percent of gross sales			5.00%
Revenues	$ 216,157,000	$ 215,727,000	$ 523,830,000	$ 506,513,000
Company Restaurant Sales
Disaggregation of Revenue [Line Items]
Revenues	74,380,000	76,682,000	179,744,000	179,514,000
Franchise Rental Revenues
Disaggregation of Revenue [Line Items]
Revenues	69,885,000	61,646,000	165,969,000	145,536,000
Franchise rental revenues	69,885,000	61,646,000	165,969,000	145,536,000
Franchise Royalties
Disaggregation of Revenue [Line Items]
Revenues	36,049,000	37,148,000	86,292,000	86,655,000
Marketing Fees
Disaggregation of Revenue [Line Items]
Revenues	30,550,000	35,947,000	79,385,000	83,810,000
Technology and Sourcing Fees
Disaggregation of Revenue [Line Items]
Revenues	3,578,000	3,042,000	8,502,000	6,993,000
Franchise Fees and Other Services
Disaggregation of Revenue [Line Items]
Revenues	$ 1,715,000	$ 1,262,000	$ 3,938,000	$ 4,005,000