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Introduction and Basis of Presentation (Details)	3 Months Ended
Introduction and Basis of Presentation (Details)	Mar. 27, 2013 restaurant	Mar. 28, 2012 restaurant
Entity and franchisee unit activity [Abstract]
Units, end of period	1,689	1,680
Company restaurants [Member]
Entity and franchisee unit activity [Abstract]
Units, beginning of period	164	206
Units opened	0	0
Units sold to franchisees	0	(6)
Units closed	0	(3)
Units, end of period	164	197
Franchised and licensed restaurants [Member]
Entity and franchisee unit activity [Abstract]
Units, beginning of period	1,524	1,479
Units opened	7	6
Units purchased from Company	0	6
Units closed	(6)	(8)
Units, end of period	1,525	1,483