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Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2018	Jul. 31, 2017
Income Statement [Abstract]
Net sales	$ 992,454	$ 872,931	$ 1,848,142	$ 1,634,121
Cost of sales	636,610	575,588	1,211,638	1,096,998
Gross profit	355,844	297,343	636,504	537,123
Selling, general and administrative expenses	238,992	222,163	465,756	440,907
Income from operations	116,852	75,180	170,748	96,216
Other income, net	1,746	1,736	1,826	2,055
Income before income taxes	118,598	76,916	172,574	98,271
Income tax expense	25,789	27,001	38,505	36,418
Net income	$ 92,809	$ 49,915	$ 134,069	$ 61,853
Net income per common share:
Basic	$ 0.85	$ 0.44	$ 1.23	$ 0.54
Diluted	$ 0.84	$ 0.44	$ 1.22	$ 0.54
Weighted-average common shares outstanding:
Basic	108,831,399	113,500,381	108,663,990	114,865,336
Diluted	110,433,840	113,760,647	110,091,586	115,126,977

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