Investments (Details) - Schedule of Income Recognized from Equity Method Investments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Investments (Details) - Schedule of Income Recognized from Equity Method Investments [Line Items]
Income From Equity Method Investments	$ 1,186	$ 5,063	$ 1,419	$ 6,543
Big River [Member]
Investments (Details) - Schedule of Income Recognized from Equity Method Investments [Line Items]
Income From Equity Method Investments	$ 1,186	2,589	$ 1,419	3,596
Patriot [Member]
Investments (Details) - Schedule of Income Recognized from Equity Method Investments [Line Items]
Income From Equity Method Investments		$ 2,474		$ 2,947