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Summary of Significant Accounting Policies Corporate Structure (Details)
Jan. 01, 2017
Restaurant
countries
Franchisor Disclosure [Line Items]  
Number of Restaurants 6,537
Entity Operated Units [Member]  
Franchisor Disclosure [Line Items]  
Number of Restaurants 330
Franchised Units [Member]  
Franchisor Disclosure [Line Items]  
Number of Restaurants 6,207
Other International | Franchised Units [Member]  
Franchisor Disclosure [Line Items]  
Number of Countries Entity Operates | countries 29