Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 29, 2018	Jul. 30, 2017	Jul. 29, 2018	Jul. 30, 2017
Earnings Per Share [Abstract]
Net income	$ 25,169	$ 12,564	$ 37,551	$ 24,385
Weighted average common shares outstanding - basic	66,063	65,763	66,194	65,801
Dilutive effect of options and restricted stock units	2,817	1,707	2,234	1,620
Weighted average common shares outstanding - diluted	68,880	67,470	68,428	67,421
Basic earnings per common share (in dollars per share)	$ 0.38	$ 0.19	$ 0.57	$ 0.37
Diluted earnings per common share (in dollars per share)	$ 0.37	$ 0.19	$ 0.55	$ 0.36
Anti-dilutive shares not included in the above calculations	202	254	364	385