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Investments (Details) - Schedule of Financial information For Equity Method Investment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014	Jul. 31, 2013
Patriot [Member]
Investments (Details) - Schedule of Financial information For Equity Method Investment [Line Items]
Net sales and revenue	$ 79,127	$ 102,416	$ 159,536	$ 196,474
Gross profit	11,244	11,046	25,029	16,189
Income from continuing operations	9,511	9,552	21,705	13,150
Net income	9,511	9,552	21,705	13,150
Big River [Member]
Investments (Details) - Schedule of Financial information For Equity Method Investment [Line Items]
Net sales and revenue	312,843	335,961	593,267	630,589
Gross profit	40,476	30,063	124,310	45,683
Income from continuing operations	48,618	21,549	100,739	28,180
Net income	$ 48,618	$ 21,549	$ 100,739	$ 28,180

The amount of gross profit (loss) reported by an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.