Commitments and Contingencies (Details) lb in Millions, gal in Millions, bu in Millions	9 Months Ended
	Oct. 31, 2015	Apr. 30, 2016 T lb bu gal
Commitments and Contingencies (Details) [Line Items]
Quantity of Bushels under Forward Purchase Contract		0.6
One Earth Energy And Nu Gen Energy [Member]
Commitments and Contingencies (Details) [Line Items]
Quantity of Bushels under Forward Purchase Contract		14.0
Quantity of Ethanol under Sales Commitment | gal		47.1
Quantity of Distillers Grains Under Sales Commitment | T		52,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments | lb		8.1
Supply Commitment Expected Period Of Delivery	They expect to deliver the ethanol, distillers grains and non-food grade corn oil through July 2016.