Investments (Details) - Schedule of Financial information For Equity Method Investment - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Patriot [Member]
Investments (Details) - Schedule of Financial information For Equity Method Investment [Line Items]
Net sales and revenue	[1]	$ 52,375	$ 79,127	$ 115,614	$ 159,536
Gross profit	[1]	10,605	11,244	14,424	25,029
Income from continuing operations	[1]	9,321	9,511	11,100	21,705
Net income	[1]	9,321	9,511	11,100	21,705
Big River [Member]
Investments (Details) - Schedule of Financial information For Equity Method Investment [Line Items]
Net sales and revenue		223,191	312,843	407,998	593,267
Gross profit		38,463	40,476	49,267	124,310
Income from continuing operations		26,663	48,618	37,040	100,739
Net income		$ 26,663	$ 48,618	$ 37,040	$ 100,739

[1] For Patriot, results are for the two and five month periods ended May 31, 2015 as the Company's equity interest in Patriot was sold June 1, 2015.