Consolidated Statement Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
Income Statement [Abstract]
Net sales	$ 7,664,063	$ 5,963,362
Cost of products sold	7,206,975	5,664,751
Gross profit	457,088	298,611
Selling, general and administrative expenses	352,632	246,496
Acquisition and integration expenses	42,066	0
LCD settlements and other, net	(12,688)	(443)
Operating expenses	382,010	246,053
Operating income	75,078	52,558
Interest expense	31,008	5,601
Other income, net	(415)	(1,034)
Income before income taxes	44,485	47,991
Provision for income taxes	13,831	14,618
Net income	$ 30,654	$ 33,373
Earnings per share:
Basic	$ 0.82	$ 0.95
Diluted	$ 0.82	$ 0.94
Weighted average common shares outstanding:
Basic	37,251	35,127
Diluted	37,468	35,370