Revenues - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jun. 29, 2022 USD ($) segment channel	Jun. 30, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Number of sales channels | channel			2
Number of segments | segment			1
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 115,017	$ 106,165	$ 218,124	$ 186,741
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	49,167	47,572	93,143	81,141
Royalties
Disaggregation of Revenue [Line Items]
Total operating revenue	28,759	27,117	55,284	47,961
Advertising revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	19,486	18,600	37,692	32,711
Initial and other fees
Disaggregation of Revenue [Line Items]
Total operating revenue	7,779	2,066	12,286	3,904
Occupancy revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	9,826	10,810	19,719	21,024
Franchise and license revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 65,850	$ 58,593	$ 124,981	$ 105,600