UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 27, 2012	Oct. 29, 2011	Oct. 27, 2012	Oct. 29, 2011
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 202,934	$ 185,180	$ 601,293	$ 541,963
Cost of goods sold, including distribution center and store occupancy costs	127,494	117,361	380,900	347,714
Gross profit	75,440	67,819	220,393	194,249
Store operating, selling and administrative expenses	41,933	39,514	125,705	115,855
Depreciation and amortization	3,207	3,334	9,613	9,914
Operating income	30,300	24,971	85,075	68,480
Interest expense, net	39	51	127	168
Income before provision for income taxes	30,261	24,920	84,948	68,312
Provision for income taxes	11,296	8,961	31,725	25,076
Net income	$ 18,965	$ 15,959	$ 53,223	$ 43,236
Earnings per share:
Basic earnings per share	$ 0.73	$ 0.60	$ 2.03	$ 1.59
Diluted earnings per share	$ 0.71	$ 0.59	$ 1.99	$ 1.56
Weighted average shares outstanding:
Basic	26,125	26,748	26,234	27,154
Diluted	26,613	27,266	26,738	27,681