Consolidated Statement Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2016	Apr. 30, 2015
Income Statement [Abstract]
Net sales	$ 5,963,362	$ 5,887,229
Cost of products sold	5,664,751	5,595,340
Gross profit	298,611	291,889
Selling, general and administrative expenses	246,496	248,462
LCD settlements, net	(443)	(38,511)
Operating expenses	246,053	209,951
Operating income	52,558	81,938
Interest expense	5,601	5,722
Other (income) expense, net	(1,034)	161
Income before income taxes	47,991	76,055
Provision for income taxes	14,618	24,778
Net income	$ 33,373	$ 51,277
Earnings per share:
Basic	$ 0.95	$ 1.39
Diluted	$ 0.94	$ 1.38
Weighted average common shares outstanding:
Basic	35,127	36,822
Diluted	35,370	37,036