Stock Repurchase Program (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 29, 2015	Sep. 27, 2016	Sep. 29, 2015	May 22, 2014
Stock Repurchase Program
Repurchase of common stock authorized by board of directors				$ 100.0
Amount paid for repurchase of common stock	$ 1.6	$ 4.1	$ 4.7
Number of shares repurchased	44,000	114,700	132,089
Amount remaining under authorized stock repurchase program		$ 69.9