QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 28, 2017	Oct. 29, 2016	Jul. 30, 2016	Apr. 30, 2016	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May 02, 2015	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Net sales	$ 246,929	$ 237,006	$ 206,933	$ 282,092	$ 245,719	$ 228,301	$ 199,261	$ 269,823	$ 972,960	$ 943,104	$ 913,486
Gross profit	81,512	83,825	68,257	105,002	85,469	82,352	65,179	99,714	338,596	332,715	326,784
Operating income	19,132	23,173	10,118	44,342	27,620	29,859	10,722	43,803	96,764	112,004	118,146
Net income	$ 12,055	$ 14,604	$ 6,510	$ 27,906	$ 17,411	$ 18,677	$ 7,031	$ 27,408	$ 61,075	$ 70,528	$ 73,584
Basic earnings per share (in dollars per share)	$ 0.55	$ 0.66	$ 0.29	$ 1.23	$ 0.76	$ 0.79	$ 0.29	$ 1.10	$ 2.75	$ 2.95	$ 2.90
Diluted earnings per share (in dollars per share)	$ 0.54	$ 0.66	$ 0.29	$ 1.22	$ 0.76	$ 0.79	$ 0.28	$ 1.09	$ 2.72	$ 2.92	$ 2.87