Impairment Of Long-Lived Assets And Other Lease Charges (Details) $ in Millions	12 Months Ended
	Jan. 03, 2016 USD ($)	Dec. 28, 2014 USD ($)	Dec. 29, 2013 USD ($)
Impaired Long-Lived Assets Held and Used [Line Items]
Other lease charges	$ 1.6	$ 1.0	$ 1.6
Other lease charges, number of restaurants	10	3	4
Asset impairment charges, number of restaurants	2	9	19
Underperforming Restaurants [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges	$ 1.5	$ 2.6	$ 2.8
Previously Impaired [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges	1.3	1.1	0.9
Initial Impairments [Member]
Impaired Long-Lived Assets Held and Used [Line Items]
Impairment charges	$ 0.2	$ 1.4	$ 1.9