Net Income per Share (Details 2) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 03, 2015	Sep. 27, 2014	Oct. 03, 2015	Sep. 27, 2014	Oct. 23, 2014	Feb. 13, 2014	Aug. 10, 2012
Share Repurchase Program
Share repurchase program, amount authorized to be repurchased					$ 30.0	$ 15.0	$ 5.0
Number of shares repurchased and retired	125,000	279,094	388,800	531,694
Average repurchase price per share (in dollars per share)	$ 22.76	$ 25.73	$ 27.83	$ 23.91
Amount available for future repurchases	$ 10.1		$ 10.1