UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 29, 2011	Oct. 30, 2010	Oct. 29, 2011	Oct. 30, 2010
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 185,180	$ 167,420	$ 541,963	$ 491,745
Cost of goods sold, including distribution center and store occupancy costs	117,361	108,361	347,714	321,803
Gross profit	67,819	59,059	194,249	169,942
Store operating, selling and administrative expenses	39,514	35,603	115,855	105,459
Depreciation and amortization	3,334	3,369	9,914	10,238
Operating income	24,971	20,087	68,480	54,245
Interest expense, net	51	13	168	64
Income before provision for income taxes	24,920	20,074	68,312	54,181
Provision for income taxes	8,961	7,486	25,076	20,239
Net income	$ 15,959	$ 12,588	$ 43,236	$ 33,942
Earnings per share:
Basic	$ 0.60	$ 0.45	$ 1.59	$ 1.19
Diluted	$ 0.59	$ 0.44	$ 1.56	$ 1.16
Weighted average shares outstanding:
Basic	26,748	28,209	27,154	28,582
Diluted	27,266	28,802	27,681	29,185