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Commitments and Contingencies (Detail) (One Earth Energy And Nu Gen Energy [Member])
Apr. 30, 2013
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One Earth Energy And Nu Gen Energy [Member]
  
Quantity of Bushels under Forward Purchase Contract (in US Bushels) 22,700,000
Quantity of Ethanol under Sales Commitment (in US Gallons) 40,800,000
Quantity of Distillers Grains Under Sales Commitment (in US Tons) 63,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments 4,300,000