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Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2019	Oct. 31, 2018
Income Statement [Abstract]
Net sales	$ 987,469	$ 973,533	$ 2,814,211	$ 2,821,675
Cost of sales	666,367	635,835	1,908,178	1,847,473
Gross profit	321,102	337,698	906,033	974,202
Selling, general and administrative expenses	245,833	241,341	712,683	707,097
Income from operations	75,269	96,357	193,350	267,105
Other income, net	576	1,235	6,754	3,061
Income before income taxes	75,845	97,592	200,104	270,166
Income tax expense	20,193	20,072	51,547	58,577
Net income	$ 55,652	$ 77,520	$ 148,557	$ 211,589
Net income per common share:
Basic	$ 0.57	$ 0.71	$ 1.48	$ 1.95
Diluted	$ 0.56	$ 0.70	$ 1.47	$ 1.92
Weighted-average common shares outstanding:
Basic	97,972,864	108,778,483	100,458,726	108,702,575
Diluted	98,628,169	110,262,879	101,147,025	110,149,105

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