Consolidated Statement Of Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Income Statement [Abstract]
Net sales	$ 6,728,151	$ 6,147,757
Cost of products sold	6,392,823	5,825,343
Gross profit	335,328	322,414
Selling, general and administrative expenses	291,596	283,360
Restatement-related expenses (Note 1)	12,236	3,023
Operating Expenses	303,832	286,383
Operating income	31,496	36,031
Interest expense	6,760	7,098
Other expense (income), net	451	(2,164)
Income before income taxes	24,285	31,097
Provision for income taxes	10,818	13,337
Net Income (Loss) Attributable to Parent	$ 13,467	$ 17,760
Net income per share:
Basic (in USD per share)	$ 0.35	$ 0.47
Diluted (in USD per share)	$ 0.35	$ 0.47
Weighted average common shares outstanding:
Basic (shares)	38,137	37,907
Diluted (shares)	38,321	38,171