Stockholders' Equity - Share repurchase programs (Details) - USD ($) $ in Thousands, shares in Millions	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016	Oct. 31, 2017	Jan. 31, 2017	Aug. 31, 2015	Oct. 31, 2014
Stockholders' Equity
Number of shares of common stock issued	0.8
Program Amount authorized to repurchase				$ 100,000	$ 100,000	$ 100,000	$ 100,000
Repurchase of common stock		$ 40,543	$ 71,448