QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Jan. 29, 2011	Oct. 30, 2010	Jul. 31, 2010	May 01, 2010	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Net sales	$ 190,681	$ 185,180	$ 153,127	$ 203,656	$ 173,209	$ 167,420	$ 139,819	$ 184,506	$ 732,645	$ 664,954	$ 593,492
Gross profit	68,160	67,819	50,637	75,793	60,459	59,059	44,775	66,109	262,408	230,402	196,200
Operating income	25,052	24,971	9,368	34,141	19,303	20,087	6,481	27,676	93,531	73,547	52,407
Net income	$ 15,824	$ 15,959	$ 5,940	$ 21,337	$ 12,458	$ 12,588	$ 4,013	$ 17,341	$ 59,060	$ 46,400	$ 32,549
Basic earnings per share	$ 0.60	$ 0.60	$ 0.22	$ 0.78	$ 0.45	$ 0.45	$ 0.14	$ 0.60	$ 2.19	$ 1.63	$ 1.14
Diluted earnings per share	$ 0.59	$ 0.59	$ 0.21	$ 0.76	$ 0.44	$ 0.44	$ 0.14	$ 0.59	$ 2.15	$ 1.60	$ 1.12