Revenue Disaggregation of Revenue (Details) - USD ($)	4 Months Ended
	Jan. 19, 2020	Jan. 20, 2019
Disaggregation of Revenue [Line Items]
Initial franchise fee	$ 50,000
Royalty and marketing fee, percent of gross sales	5.00%
Revenues	$ 307,673,000	$ 290,786,000
Company Restaurant Sales
Disaggregation of Revenue [Line Items]
Revenues	105,364,000	102,832,000
Franchise Rental Revenues
Disaggregation of Revenue [Line Items]
Franchise rental revenues	96,084,000	83,890,000
Franchise Royalties
Disaggregation of Revenue [Line Items]
Revenues	50,243,000	49,507,000
Marketing Fees
Disaggregation of Revenue [Line Items]
Revenues	48,835,000	47,863,000
Technology and Sourcing Fees
Disaggregation of Revenue [Line Items]
Revenues	4,924,000	3,951,000
Franchise Fees and Other Services
Disaggregation of Revenue [Line Items]
Revenues	$ 2,223,000	$ 2,743,000