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Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2018	Oct. 31, 2017
Income Statement [Abstract]
Net sales	$ 973,533	$ 892,774	$ 2,821,675	$ 2,526,895
Cost of sales	635,835	595,028	1,847,473	1,692,026
Gross profit	337,698	297,746	974,202	834,869
Selling, general and administrative expenses	241,341	224,858	707,097	665,765
Income from operations	96,357	72,888	267,105	169,104
Other income (expense), net	1,235	(882)	3,061	1,173
Income before income taxes	97,592	72,006	270,166	170,277
Income tax expense	20,072	26,914	58,577	63,332
Net income	$ 77,520	$ 45,092	$ 211,589	$ 106,945
Net income per common share:
Basic	$ 0.71	$ 0.41	$ 1.95	$ 0.95
Diluted	$ 0.70	$ 0.41	$ 1.92	$ 0.94
Weighted-average common shares outstanding:
Basic	108,778,483	109,667,224	108,702,575	113,113,597
Diluted	110,262,879	110,100,254	110,149,105	113,432,367

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