Quarterly Results of Operations and Seasonality (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 263,756	$ 137,979	$ 152,479	$ 126,004	$ 211,964	$ 110,747	$ 117,087	$ 95,604	$ 680,218	$ 535,402	$ 418,825
Gross profit	106,328	41,623	50,905	38,935	84,169	34,234	39,400	30,213	237,791	188,016	149,836
Net income	$ 33,313	$ 3,311	$ 8,320	$ 3,080	$ 24,826	$ 1,677	$ 4,069	$ 1,570	$ 48,024	$ 32,142	$ 20,025
Basic (loss) income per common share (dollars per share)	$ 0.61	$ 0.06	$ 0.15	$ 0.06	$ 0.46	$ 0.03	$ 0.08	$ 0.03	$ 0.89	$ 0.59	$ (1.28)
Diluted (loss) income per common share (dollars per share)	$ 0.61	$ 0.06	$ 0.15	$ 0.06	$ 0.45	$ 0.03	$ 0.07	$ 0.03	$ 0.88	$ 0.59	$ (1.28)
Fiscal year period									364 days	364 days	371 days