Consolidated Statement Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2017	Jul. 31, 2016
Income Statement [Abstract]
Net sales	$ 8,882,691	$ 6,353,739	$ 16,546,754	$ 12,317,101
Cost of products sold	8,367,100	6,037,289	15,574,075	11,702,040
Gross profit	515,591	316,450	972,679	615,061
Selling, general and administrative expenses	410,598	243,763	763,230	490,259
Acquisition, integration and restructuring expenses	30,117	1,982	72,183	1,982
LCD settlements and other, net	(28,655)	(3,699)	(41,343)	(4,142)
Value added tax assessments	0	1,049	0	1,049
Operating expenses	412,060	243,095	794,070	489,148
Operating income	103,531	73,355	178,609	125,913
Interest expense	28,272	6,288	59,280	11,889
Other expense (income), net	284	(1,230)	(131)	(2,264)
Income before income taxes	74,975	68,297	119,460	116,288
Provision for income taxes	27,516	21,903	41,347	36,521
Net income	$ 47,459	$ 46,394	$ 78,113	$ 79,767
Earnings per share:
Basic	$ 1.24	$ 1.32	$ 2.07	$ 2.27
Diluted	$ 1.24	$ 1.31	$ 2.06	$ 2.26
Weighted average common shares outstanding:
Basic	38,174	35,207	37,720	35,167
Diluted	38,388	35,378	37,935	35,373