Introduction and Basis of Reporting (Details)	12 Months Ended
	Dec. 27, 2017 Countries restaurant States Territories
Franchisor Disclosure [Line Items]
Number of states in which entity operates | States	50
Number of territories in which entity operates | Territories	2
Number of foreign countries in which entity operates | Countries	12
Number of restaurants	1,735
Franchised and licensed restaurants [Member]
Franchisor Disclosure [Line Items]
Number of restaurants	1,557
Company-owned restaurants [Member]
Franchisor Disclosure [Line Items]
Number of restaurants	178
California [Member]
Franchisor Disclosure [Line Items]
Percentage of restaurants operated by geographic region	23.00%
Texas [Member]
Franchisor Disclosure [Line Items]
Percentage of restaurants operated by geographic region	11.00%
Florida [Member]
Franchisor Disclosure [Line Items]
Percentage of restaurants operated by geographic region	8.00%