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Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Income Statement [Abstract]
Net sales	$ 864,413	$ 855,688
Cost of sales	595,357	575,028
Gross profit	269,056	280,660
Selling, general and administrative expenses	229,036	226,764
Income from operations	40,020	53,896
Other income, net	2,680	80
Income before income taxes	42,700	53,976
Income tax expense	10,115	12,716
Net income	$ 32,585	$ 41,260
Net income per common share:
Basic	$ 0.31	$ 0.38
Diluted	$ 0.31	$ 0.38
Weighted-average common shares outstanding:
Basic	104,437,460	108,490,926
Diluted	105,340,148	109,743,677

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