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Net Sales and Revenue (Details) - Schedule of Net Sales and Revenue for Each Product and Service Group - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2015
Jul. 31, 2014
Revenue from External Customer [Line Items]        
Product or Service $ 113,480 $ 150,231 $ 218,677 $ 306,156
Ethanol [Member]        
Revenue from External Customer [Line Items]        
Product or Service 86,990 118,613 165,562 237,719
Dried distillers grains [Member]        
Revenue from External Customer [Line Items]        
Product or Service 21,585 25,809 41,836 56,838
Non-food grade corn oil [Member]        
Revenue from External Customer [Line Items]        
Product or Service 4,049 4,729 8,008 8,659
Modified distillers grains [Member]        
Revenue from External Customer [Line Items]        
Product or Service 696 791 3,001 2,281
Other [Member]        
Revenue from External Customer [Line Items]        
Product or Service $ 160 $ 289 $ 270 $ 659