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Commitments and Contingencies (Details)
lb in Millions, gal in Millions, bu in Millions
 6 Months Ended
Jul. 31, 2016
T
lb
bu
gal
Jul. 31, 2015
bu
Commitments and Contingencies (Details) [Line Items]    
Quantity of Bushels under Forward Purchase Contract 0.9 1.1
One Earth Energy And Nu Gen Energy [Member]    
Commitments and Contingencies (Details) [Line Items]    
Quantity of Bushels under Forward Purchase Contract 8.2  
Quantity of Ethanol under Sales Commitment | gal 37.2  
Quantity of Distillers Grains Under Sales Commitment | T 61,000  
Quantity of Non-food Grade Corn Oil Under Sales Commitments | lb 9.9  
Supply Commitment Expected Period Of Delivery They expect to deliver the ethanol, distillers grains and non-food grade corn oil through September2016.