Quarterly Results of Operations and Seasonality (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 388,090	$ 199,475	$ 220,130	$ 192,715	$ 326,351	$ 169,685	$ 182,191	$ 153,727	$ 1,000,410	$ 831,954	$ 680,218
Gross profit	159,417	64,003	73,350	60,267	132,182	52,765	59,826	47,161	357,037	291,934	237,791
Net income	$ 49,788	$ 5,447	$ 9,847	$ 6,758	$ 42,004	$ 4,337	$ 7,061	$ 4,278	$ 71,840	$ 57,680	$ 48,024
Basic (loss) income per common share (dollars per share)	$ 0.91	$ 0.10	$ 0.18	$ 0.12	$ 0.77	$ 0.08	$ 0.13	$ 0.08	$ 1.31	$ 1.06	$ 0.89
Diluted (loss) income per common share (dollars per share)	$ 0.90	$ 0.10	$ 0.18	$ 0.12	$ 0.77	$ 0.08	$ 0.13	$ 0.08	$ 1.30	$ 1.05	$ 0.88