CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 732,645	$ 664,954	$ 593,492
Cost of goods sold, including distribution center and store occupancy costs	470,237	434,552	397,292
Gross profit	262,408	230,402	196,200
Store operating, selling and administrative expenses	155,672	143,232	129,888
Depreciation and amortization	13,205	13,623	13,905
Operating income	93,531	73,547	52,407
Interest income	25	42	60
Interest expense	(242)	(147)	(117)
Interest expense, net	(217)	(105)	(57)
Income before provision for income taxes	93,314	73,442	52,350
Provision for income taxes	34,254	27,042	19,801
Net income	$ 59,060	$ 46,400	$ 32,549
Basic earnings per share	$ 2.19	$ 1.63	$ 1.14
Diluted earnings per share	$ 2.15	$ 1.60	$ 1.12
Basic	26,978	28,426	28,629
Diluted	27,506	29,033	29,089