QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Feb. 02, 2013	Oct. 27, 2012	Jul. 28, 2012	Apr. 28, 2012	Jan. 28, 2012	Oct. 29, 2011	Jul. 30, 2011	Apr. 30, 2011	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Net sales	$ 217,407	$ 202,934	$ 165,445	$ 232,914	$ 190,681	$ 185,180	$ 153,127	$ 203,656	$ 818,700	$ 732,645	$ 664,954
Gross profit	78,489	75,440	56,525	88,428	68,160	67,819	50,637	75,793	298,882	262,408	230,402
Operating income	30,906	30,300	12,377	42,399	25,052	24,971	9,368	34,141	115,981	93,531	73,547
Net income	$ 19,359	$ 18,965	$ 7,895	$ 26,363	$ 15,824	$ 15,959	$ 5,940	$ 21,337	$ 72,582	$ 59,060	$ 46,400
Basic earnings per share (in dollars per share)	$ 0.75	$ 0.73	$ 0.30	$ 1.00	$ 0.60	$ 0.60	$ 0.22	$ 0.78	$ 2.78	$ 2.19	$ 1.63
Diluted earnings per share (in dollars per share)	$ 0.73	$ 0.71	$ 0.30	$ 0.98	$ 0.59	$ 0.59	$ 0.21	$ 0.76	$ 2.72	$ 2.15	$ 1.60