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Revenues - Disaggregation of Revenues (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 23, 2020 USD ($)	Sep. 25, 2019 USD ($)	Sep. 23, 2020 USD ($) sale_channel segment	Sep. 25, 2019 USD ($)
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	$ 71,644	$ 124,258	$ 208,500	$ 427,553
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	27,849	63,582	85,268	257,574
Royalties
Disaggregation of Revenue [Line Items]
Total operating revenue	17,896	27,830	48,462	79,742
Advertising revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	13,927	20,756	38,685	59,582
Initial and other fees
Disaggregation of Revenue [Line Items]
Total operating revenue	1,890	1,356	4,933	4,250
Occupancy revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	10,082	10,734	31,152	26,405
Franchise and license revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 43,795	$ 60,676	$ 123,232	$ 169,979

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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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