Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 28, 2018	Oct. 29, 2017	Oct. 28, 2018	Oct. 29, 2017
Earnings Per Share [Abstract]
Net income	$ 12,165	$ 13,338	$ 49,716	$ 37,723
Weighted average common shares outstanding - basic	66,014	66,194	66,134	65,932
Dilutive effect of options and restricted stock units	2,717	1,623	2,415	1,623
Weighted average common shares outstanding - diluted	68,731	67,817	68,549	67,555
Basic earnings per common share (in dollars per share)	$ 0.18	$ 0.20	$ 0.75	$ 0.57
Diluted earnings per common share (in dollars per share)	$ 0.18	$ 0.20	$ 0.73	$ 0.56
Anti-dilutive shares not included in the above calculations	289	362	496	447