Unaudited Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Aug. 03, 2019	Aug. 04, 2018	Aug. 03, 2019	Aug. 04, 2018
Unaudited Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 252,440	$ 211,123	$ 595,735	$ 485,830
Cost of goods sold	176,067	144,772	400,759	322,706
Gross margin	76,373	66,351	194,976	163,124
Store operating, selling and administrative expenses	80,334	61,965	154,373	123,869
Depreciation and amortization	7,680	6,271	14,903	12,519
Operating (loss) income	(11,641)	(1,885)	25,700	26,736
Interest expense, net	(73)	(167)	(29)	(111)
(Loss) income before provision for income taxes	(11,568)	(1,718)	25,729	26,847
(Benefit) provision for income taxes	(2,790)	(496)	6,650	6,560
Net (loss) income	$ (8,778)	$ (1,222)	$ 19,079	$ 20,287
Basic (loss) earnings per share (in dollars per share)	$ (0.49)	$ (0.06)	$ 1.05	$ 1.07
Diluted (loss) earnings per share (in dollars per share)	$ (0.49)	$ (0.06)	$ 1.05	$ 1.06
Weighted average shares outstanding:
Basic (in shares)	17,906	18,823	18,107	18,896
Diluted (in shares)	17,906	18,823	18,220	19,079