Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016
Numerator:
Net income	$ 9,533	$ 6,338	$ 19,582	$ 13,664
Denominator:
Weighted average common shares outstanding-basic	60,404,222	50,836,727	60,385,495	50,836,727
Effect of dilutive securities:
Stock options and restricted stock units	3,060,284	1,385,781	2,430,818	1,578,274
Weighted average common shares outstanding-diluted	63,464,506	52,222,508	62,816,313	52,415,001
Per common share:
Basic net income per common share	$ 0.16	$ 0.12	$ 0.32	$ 0.27
Diluted net income per common share	$ 0.15	$ 0.12	$ 0.31	$ 0.26