Consolidated Statement Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Income Statement [Abstract]
Net sales	$ 6,490,265	$ 6,428,540	$ 18,807,366	$ 18,896,162
Cost of products sold	6,174,426	6,113,696	17,876,466	17,964,150
Gross profit	315,839	314,844	930,900	932,012
Selling, general and administrative expenses	239,952	249,840	730,211	748,436
Acquisition and integration expenses	13,015	0	14,997	0
LCD settlements and other, net	0	(3,049)	(4,142)	(63,087)
Value added tax assessments	0	0	1,049	(9,563)
Operating expenses	252,967	246,791	742,115	675,786
Operating income	62,872	68,053	188,785	256,226
Interest expense	9,475	5,619	21,364	8,021
Other expense (income), net	1,747	898	(517)	1,110
Income before income taxes	51,650	61,536	167,938	247,095
Provision for income taxes	15,144	19,636	51,665	77,506
Net income	$ 36,506	$ 41,900	$ 116,273	$ 169,589
Earnings per share:
Basic	$ 1.04	$ 1.19	$ 3.30	$ 4.69
Diluted	$ 1.03	$ 1.18	$ 3.29	$ 4.66
Weighted average common shares outstanding:
Basic	35,218	35,214	35,184	36,174
Diluted	35,449	35,397	35,393	36,354