Quarterly Results of Operations and Seasonality (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Feb. 03, 2018	Oct. 28, 2017	Jul. 29, 2017	Apr. 29, 2017	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016
Quarterly Financial Information Disclosure [Abstract]
Net sales	$ 504,832	$ 257,175	$ 283,320	$ 232,881	$ 388,090	$ 199,475	$ 220,130	$ 192,715	$ 1,278,208	$ 1,000,410	$ 831,954
Gross profit	207,490	83,631	98,506	73,786	159,417	64,003	73,350	60,267	463,413	357,037	291,934
Net income	$ 67,377	$ 9,879	$ 16,804	$ 8,391	$ 49,788	$ 5,447	$ 9,847	$ 6,758	$ 102,451	$ 71,840	$ 57,680
Basic (loss) income per common share (dollars per share)	$ 1.22	$ 0.18	$ 0.30	$ 0.15	$ 0.91	$ 0.10	$ 0.18	$ 0.12	$ 1.86	$ 1.31	$ 1.06
Diluted (loss) income per common share (dollars per share)	$ 1.21	$ 0.18	$ 0.30	$ 0.15	$ 0.90	$ 0.10	$ 0.18	$ 0.12	$ 1.84	$ 1.30	$ 1.05