Business and Summary of Significant Accounting Policies (Revenue Recognition) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 30, 2014 restaurant	Dec. 31, 2013 restaurant	Jan. 01, 2013 restaurant
Franchisor Disclosure [Line Items]
Percent of gift cards expected to be unredeemed (percent)	6.00%
Gift card estimated redemption period	18 months
Gift cards breakage	0.2
Franchise [Member]
Franchisor Disclosure [Line Items]
Number of restaurants	53	62	51
Number of restaurants opened during period	10	11	6