UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 28, 2012	Apr. 30, 2011
UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS [Abstract]
Net sales	$ 232,914	$ 203,656
Cost of goods sold, including distribution center and store occupancy costs	144,486	127,863
Gross profit	88,428	75,793
Store operating, selling and administrative expenses	42,803	38,373
Depreciation and amortization	3,226	3,279
Operating income	42,399	34,141
Interest expense, net	48	56
Income before provision for income taxes	42,351	34,085
Provision for income taxes	15,988	12,748
Net income	$ 26,363	$ 21,337
Earnings per share:
Basic	$ 1.00	$ 0.78
Diluted	$ 0.98	$ 0.76
Weighted average shares outstanding:
Basic	26,349	27,446
Diluted	26,898	27,973