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Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Income Statement [Abstract]
Net sales	$ 855,688	$ 761,190
Cost of sales	575,028	521,410
Gross profit	280,660	239,780
Selling, general and administrative expenses	226,764	218,744
Income from operations	53,896	21,036
Other income, net	80	319
Income before income taxes	53,976	21,355
Income tax expense	12,716	9,417
Net income	$ 41,260	$ 11,938
Net income per common share:
Basic	$ 0.38	$ 0.10
Diluted	$ 0.38	$ 0.10
Weighted-average common shares outstanding:
Basic	108,490,926	116,276,289
Diluted	109,743,677	116,539,305

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