Description of Business and Organization - Additional Information (Details)	Sep. 30, 2018 Restaurant Country
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	25,066
Number of countries in which company and franchise restaurants operated (more than) | Country	100
Percentage of franchised Tim Hortons, Burger King, and Popeyes restaurants	100.00%
Tim Hortons brand
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	4,805
Burger King brand
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	17,239
Popeyes brand
Basis Of Presentation [Line Items]
Number of franchised or owned restaurants	3,022