Revenues - (Disaggregation of Revenues) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2021	Dec. 30, 2020	Dec. 25, 2019
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 398,174	$ 288,605	$ 541,389
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	175,017	118,160	306,377
Royalties
Disaggregation of Revenue [Line Items]
Total operating revenue	103,425	67,501	108,813
Advertising revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	69,957	53,745	81,144
Initial and other fees
Disaggregation of Revenue [Line Items]
Total operating revenue	8,009	7,332	6,541
Occupancy revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	41,766	41,867	38,514
Franchise and license revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 223,157	$ 170,445	$ 235,012