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Revenues - (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 30, 2020 USD ($)	Sep. 23, 2020 USD ($)	Jun. 24, 2020 USD ($)	Mar. 25, 2020 USD ($)	Dec. 25, 2019 USD ($)	Sep. 25, 2019 USD ($)	Jun. 26, 2019 USD ($)	Mar. 27, 2019 USD ($)	Dec. 30, 2020 USD ($) segment sale_channel	Dec. 25, 2019 USD ($)	Dec. 26, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Number of sales channels | sale_channel									2
Number of operating segments | segment									1
Total operating revenue	$ 80,105	$ 71,644	$ 40,161	$ 96,695	$ 113,836	$ 124,258	$ 151,884	$ 151,411	$ 288,605	$ 541,389	$ 630,179
Contract with customer	1,997								1,997
Revenue recognized included in beginning deferred franchise revenue balance										3,200
Company restaurant sales
Disaggregation of Revenue [Line Items]
Total operating revenue	32,892	$ 27,849	$ 15,128	$ 42,291	48,803	$ 63,582	$ 95,447	$ 98,545	118,160	306,377	411,932
Franchise and License Revenue
Disaggregation of Revenue [Line Items]
Total operating revenue									170,400	235,000	$ 218,200
Gift Card Redemption
Disaggregation of Revenue [Line Items]
Contract with customer	$ 6,100				$ 6,500				6,100	$ 6,500
Revenue recognized included in beginning deferred franchise revenue balance									$ 400

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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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