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Restaurant Acquisition (Details) $ in Thousands				6 Months Ended
	May 01, 2018 USD ($) restaurant	Apr. 16, 2018 USD ($) restaurant	Feb. 19, 2018 USD ($) restaurant	Jun. 30, 2018 USD ($)	Jul. 01, 2017 USD ($)	Dec. 30, 2017 USD ($)
Business Acquisition [Line Items]
Number of Restaurants Acquired from a Franchisee | restaurant	1	1	1
Acquisition of restaurant from franchisee	$ 2,200	$ 1,900	$ 1,900	$ 5,996	$ 0
Business Acquisition, Goodwill, Expected Tax Deductible Amount				3,100
Working capital	7	20	4
Property and equipment	28	160	26
Reacquired franchise rights	887	1,277	541
Goodwill	1,309	458	1,331	$ 49,655		$ 46,557
Gift card liability	0	0	(2)
Total purchase price	$ 2,231	$ 1,915	$ 1,900

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The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes.

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