Investments (Details) - Schedule of Financial information For Equity Method Investment (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2013	Jul. 31, 2012
Patriot [Member]
Investments (Details) - Schedule of Financial information For Equity Method Investment [Line Items]
Net sales and revenue	$ 102,416	$ 81,578	$ 196,474	$ 171,389
Gross profit (loss)	11,046	(569)	16,189	1,208
Income (loss) from continuing operations	9,552	(2,209)	13,150	(2,645)
Net income (loss)	9,552	(2,209)	13,150	(2,645)
Big River [Member]
Investments (Details) - Schedule of Financial information For Equity Method Investment [Line Items]
Net sales and revenue	335,961	258,848	630,589	549,851
Gross profit (loss)	30,063	8,507	45,683	22,515
Income (loss) from continuing operations	21,549	1,068	28,180	6,786
Net income (loss)	$ 21,549	$ 1,068	$ 28,180	$ 6,786