CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Income Statement [Abstract]
Net sales	$ 883,476	$ 909,865	$ 1,783,145	$ 1,816,714
Cost of goods sold	562,024	572,808	1,140,381	1,156,890
Gross profit	321,452	337,057	642,764	659,824
Selling, general and administrative expenses	198,274	191,044	504,547	469,560
Depreciation and amortization	8,033	6,611	22,898	18,213
Operating profit	115,145	139,402	115,319	172,051
Equity loss in unconsolidated affiliates	(1,437)		(820)	(3)
Other Income		896		896
Interest and financing charges, net	(1,701)	(1,955)	(3,999)	(4,107)
Income before income taxes	112,007	138,343	110,500	168,840
Income tax expense	41,443	51,187	38,458	62,471
Net income	$ 70,564	$ 87,156	$ 72,042	$ 106,369
Basic:
Net income per common share (in dollars per share)	$ 1.54	$ 1.92	$ 1.58	$ 2.36
Weighted average number of shares outstanding (in shares)	45,918	45,311	45,713	45,117
Diluted:
Net income per common share (in dollars per share)	$ 1.50	$ 1.87	$ 1.53	$ 2.29
Weighted average number of shares outstanding (in shares)	46,902	46,526	46,947	46,392
Net income	$ 70,564	$ 87,156	$ 72,042	$ 106,369
Other comprehensive income (loss):
Foreign currency translation adjustments	(59)	929	3,163	(9,078)
Other comprehensive income (loss)	(59)	929	3,163	(9,078)
Comprehensive income	$ 70,505	$ 88,085	$ 75,205	$ 97,291