Commitments and Contingencies (Details) lb in Millions, gal in Millions, bu in Millions, $ in Millions	3 Months Ended
	Apr. 30, 2019 USD ($) MMBTU T lb bu gal	Apr. 30, 2018 USD ($)
One Earth Energy And Nu Gen Energy [Member]
Commitments and Contingencies (Details) [Line Items]
Quantity of Bushels under Forward Purchase Contract (in US Bushels) | bu	11.2
Quantity Of Natural Gas Under Sales Commitment (in Millions of British Thermal Units) | MMBTU	388,000
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal	45.2
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T	65,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb	18.5
Refined Coal [Member]
Commitments and Contingencies (Details) [Line Items]
Fees Incurred By Subsidiary | $	$ 1.5	$ 1.8