Business and Summary of Significant Accounting Policies (Revenue Recognition) (Details) $ in Millions	12 Months Ended
	Jan. 03, 2017 USD ($) restaurant	Dec. 29, 2015 USD ($) restaurant	Dec. 30, 2014 USD ($) restaurant
Accounting Policies [Abstract]
Percent of gift cards expected to be unredeemed (percent)	6.00%
Gift card estimated redemption period	18 months
Gift cards breakage | $	$ 0.3	$ 0.3	$ 0.2
Franchise [Member]
Franchisor Disclosure [Line Items]
Number of restaurants	75	70	53
Number of restaurants opened during period	6	19	10