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Condensed Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2017	Oct. 31, 2016	Oct. 31, 2017	Oct. 31, 2016
Income Statement [Abstract]
Net sales	$ 892,774	$ 862,491	$ 2,526,895	$ 2,515,636
Cost of sales	595,028	562,594	1,692,026	1,611,337
Gross profit	297,746	299,897	834,869	904,299
Selling, general and administrative expenses	224,858	229,592	665,765	665,299
Income from operations	72,888	70,305	169,104	239,000
Other (expense) income, net	(882)	854	1,173	348
Income before income taxes	72,006	71,159	170,277	239,348
Income tax expense	26,914	23,804	63,332	85,516
Net income	$ 45,092	$ 47,355	$ 106,945	$ 153,832
Net income per common share:
Basic	$ 0.41	$ 0.41	$ 0.95	$ 1.31
Diluted	$ 0.41	$ 0.40	$ 0.94	$ 1.31
Weighted-average common shares outstanding:
Basic	109,667,224	116,829,912	113,113,597	117,087,696
Diluted	110,100,254	117,393,710	113,432,367	117,453,005

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