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Revenues - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2022 USD ($)	Sep. 29, 2021 USD ($)	Sep. 28, 2022 USD ($) channel	Sep. 29, 2021 USD ($)
Revenue from Contract with Customer [Abstract]
Number of sales channels | channel			2
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 117,456	$ 103,794	$ 335,580	$ 290,535
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	52,211	46,470	145,354	127,611
Royalties
Disaggregation of Revenue [Line Items]
Total operating revenue	28,992	27,336	84,276	75,297
Advertising revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	18,950	18,215	56,642	50,926
Initial and other fees
Disaggregation of Revenue [Line Items]
Total operating revenue	7,749	1,442	20,035	5,346
Occupancy revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	9,554	10,331	29,273	31,355
Franchise and license revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 65,245	$ 57,324	$ 190,226	$ 162,924

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Number Of Sales Channels

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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