Consolidated Statement Of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Income Statement [Abstract]
Net sales	$ 8,548,319	$ 7,023,620
Cost of products sold	8,025,202	6,566,532
Gross profit	523,117	457,088
Selling, general and administrative expenses	422,361	352,632
Acquisition, integration and restructuring expenses	33,225	42,066
LCD settlements and other, net	(2,965)	(12,688)
Operating expenses	452,621	382,010
Operating income	70,496	75,078
Interest expense	25,922	31,008
Other expense (income), net	1,917	(415)
Income before income taxes	42,657	44,485
Provision for income taxes	8,958	13,831
Net income	$ 33,699	$ 30,654
Earnings per share:
Basic	$ 0.88	$ 0.82
Diluted	$ 0.87	$ 0.82
Weighted average common shares outstanding:
Basic	38,281	37,251
Diluted	38,561	37,468