Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2011	Oct. 31, 2010	Oct. 31, 2011	Oct. 31, 2010
Condensed Consolidated Statements of Operations [Abstract]
Net sales	$ 510,009	$ 450,002	$ 936,855	$ 793,239
Cost of goods sold	347,734	296,055	649,554	529,502
Gross profit	162,275	153,947	287,301	263,737
Selling, general and administrative expenses	86,958	80,140	204,708	183,665
Depreciation and amortization	1,875	1,508	5,251	4,065
Operating profit	73,442	72,299	77,342	76,007
Equity in loss of joint venture	337		812
Interest and financing charges, net	2,297	1,706	4,009	2,702
Income before income taxes	70,808	70,593	72,521	73,305
Income tax expense	27,253	27,871	27,921	28,955
Net income	$ 43,555	$ 42,722	$ 44,600	$ 44,350
Basic:
Net income per common share	$ 2.19	$ 2.22	$ 2.25	$ 2.32
Weighted average number of shares outstanding	19,845	19,227	19,804	19,087
Diluted:
Net income per common share	$ 2.16	$ 2.16	$ 2.21	$ 2.26
Weighted average number of shares outstanding	20,172	19,764	20,209	19,606