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Revenues - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 24, 2020 USD ($)	Jun. 26, 2019 USD ($)	Jun. 24, 2020 USD ($) sale_channel segment	Jun. 26, 2019 USD ($)
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	$ 40,161	$ 151,884	$ 136,856	$ 303,295
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	15,128	95,447	57,419	193,992
Royalties
Disaggregation of Revenue [Line Items]
Total operating revenue	6,719	26,672	30,566	51,912
Advertising revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	7,232	19,884	24,758	38,826
Initial and other fees
Disaggregation of Revenue [Line Items]
Total operating revenue	1,346	1,755	3,043	2,894
Occupancy revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	9,736	8,126	21,070	15,671
Franchise and license revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 25,033	$ 56,437	$ 79,437	$ 109,303

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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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