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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 9 Months Ended
Oct. 31, 2015
Oct. 31, 2014
Oct. 31, 2015
Oct. 31, 2014
Revenue from External Customer [Line Items]        
Product or Service $ 110,584 $ 138,424 $ 329,261 $ 444,580
Ethanol [Member]        
Revenue from External Customer [Line Items]        
Product or Service 82,767 110,178 248,329 347,896
Dried distillers grains [Member]        
Revenue from External Customer [Line Items]        
Product or Service 22,518 23,108 64,354 79,946
Non-food grade corn oil [Member]        
Revenue from External Customer [Line Items]        
Product or Service 3,994 4,340 12,002 12,999
Modified distillers grains [Member]        
Revenue from External Customer [Line Items]        
Product or Service 1,108 603 4,109 2,884
Other [Member]        
Revenue from External Customer [Line Items]        
Product or Service $ 197 $ 195 $ 467 $ 855