Leases (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 03, 2017	Dec. 29, 2015	Dec. 30, 2014
Operating Leased Assets [Line Items]
Operating leases, lease term	10 years
Operating leases, rent expense	$ 48.5	$ 44.6	$ 37.9
Minimum
Operating Leased Assets [Line Items]
Operating leases, extension term	5 years
Maximum
Operating Leased Assets [Line Items]
Operating leases, extension term	15 years