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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Concentration Risk) (Details)
12 Months Ended
Dec. 28, 2016
Dec. 30, 2015
Dec. 31, 2014
Revenue from franchises and licenses risk [Member]      
Concentration Risk [Line Items]      
Franchise revenue, percentage 29.00% 29.00% 32.00%