QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Jan. 31, 2015	Nov. 01, 2014	Aug. 02, 2014	May 03, 2014	Feb. 01, 2014	Nov. 02, 2013	Aug. 03, 2013	May 04, 2013	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013
QUARTERLY FINANCIAL DATA (UNAUDITED) [Abstract]
Net sales	$ 239,338	$ 218,321	$ 193,918	$ 261,909	$ 217,767	$ 207,971	$ 186,235	$ 239,993	$ 913,486	$ 851,965	$ 818,700
Gross profit	85,030	79,150	64,408	98,196	77,973	76,488	63,927	90,877	326,784	309,265	298,882
Operating income	31,947	26,812	13,723	45,664	27,042	27,443	16,966	42,439	118,146	113,891	115,981
Net income	$ 19,925	$ 16,890	$ 8,380	$ 28,388	$ 16,870	$ 17,250	$ 10,542	$ 26,214	$ 73,584	$ 70,877	$ 72,582
Basic earnings per share (in dollars per share)	$ 0.80	$ 0.67	$ 0.33	$ 1.10	$ 0.65	$ 0.67	$ 0.41	$ 1.01	$ 2.90	$ 2.74	$ 2.78
Diluted earnings per share (in dollars per share)	$ 0.79	$ 0.67	$ 0.32	$ 1.09	$ 0.64	$ 0.66	$ 0.40	$ 1.00	$ 2.87	$ 2.70	$ 2.72