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Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Income Statement [Abstract]
Net sales	$ 872,931	$ 890,568	$ 1,634,121	$ 1,653,145
Cost of sales	575,588	548,057	1,096,998	1,048,743
Gross profit	297,343	342,511	537,123	604,402
Selling, general and administrative expenses	222,163	224,299	440,907	435,707
Income from operations	75,180	118,212	96,216	168,695
Other income (expense), net	1,736	1,071	2,055	(506)
Income before income taxes	76,916	119,283	98,271	168,189
Income tax expense	27,001	42,368	36,418	61,712
Net income	$ 49,915	$ 76,915	$ 61,853	$ 106,477
Net income per common share:
Basic	$ 0.44	$ 0.66	$ 0.54	$ 0.91
Diluted	$ 0.44	$ 0.66	$ 0.54	$ 0.91
Weighted-average common shares outstanding:
Basic	113,500,381	117,133,169	114,865,336	117,218,013
Diluted	113,760,647	117,383,132	115,126,977	117,484,131

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