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Revenues - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 29, 2021 USD ($)	Sep. 23, 2020 USD ($)	Sep. 29, 2021 USD ($) segment sale_channel	Sep. 23, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Number of sales channels | sale_channel			2
Number of segments | segment			1
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 103,794	$ 71,644	$ 290,535	$ 208,500
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	46,470	27,849	127,611	85,268
Royalties
Disaggregation of Revenue [Line Items]
Total operating revenue	27,336	17,896	75,297	48,462
Advertising revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	18,215	13,927	50,926	38,685
Initial and other fees
Disaggregation of Revenue [Line Items]
Total operating revenue	1,442	1,890	5,346	4,933
Occupancy revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	10,331	10,082	31,355	31,152
Franchise and license revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 57,324	$ 43,795	$ 162,924	$ 123,232

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Number Of Sales Channels

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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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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