QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 30, 2016	Oct. 31, 2015	Aug. 01, 2015	May. 02, 2015	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May. 03, 2014	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Net sales	$ 245,719	$ 228,301	$ 199,261	$ 269,823	$ 239,338	$ 218,321	$ 193,918	$ 261,909	$ 943,104	$ 913,486	$ 851,965
Gross profit	85,469	82,352	65,179	99,714	85,030	79,150	64,408	98,196	332,715	326,784	309,265
Operating income	27,620	29,859	10,722	43,803	31,947	26,812	13,723	45,664	112,004	118,146	113,891
Net income	$ 17,411	$ 18,677	$ 7,031	$ 27,408	$ 19,925	$ 16,890	$ 8,380	$ 28,388	$ 70,528	$ 73,584	$ 70,877
Basic earnings per share (in dollars per share)	$ 0.76	$ 0.79	$ 0.29	$ 1.10	$ 0.80	$ 0.67	$ 0.33	$ 1.10	$ 2.95	$ 2.90	$ 2.74
Diluted earnings per share (in dollars per share)	$ 0.76	$ 0.79	$ 0.28	$ 1.09	$ 0.79	$ 0.67	$ 0.32	$ 1.09	$ 2.92	$ 2.87	$ 2.70