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Basis of Presentation - Overview (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) restaurant country	Jul. 01, 2017 USD ($) restaurant	Dec. 30, 2017 USD ($)
Franchisor Disclosure [Line Items]
Percentage of Revenue Collected for Advertising Fund	3.00%
Restricted Cash and Cash Equivalents, Current | $	$ 2,518		$ 2,329
Franchised Units
Franchisor Disclosure [Line Items]
Number of Restaurants	1,162	1,035
Franchised Units | United States
Franchisor Disclosure [Line Items]
Number of Restaurants	1,040
Franchised Units | Non-US
Franchisor Disclosure [Line Items]
Number of Restaurants	122
Number of Countries in which Entity Operates | country	9
Entity Operated Units
Franchisor Disclosure [Line Items]
Number of Restaurants	26	21
Selling, General and Administrative Expenses
Franchisor Disclosure [Line Items]
Franchise Advertising Fund Discretionary Contributions | $	$ 1,900	$ 3,800

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 8
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-Name Accounting Standards Codification
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