Commitments and Contingencies (Details) lb in Millions, gal in Millions, bu in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 31, 2021 USD ($) MMBTU T lb bu gal	Oct. 31, 2020 USD ($)	Oct. 31, 2021 USD ($) MMBTU T lb bu gal	Oct. 31, 2020 USD ($)
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	12.4		12.4
Quantity Of Natural Gas Under Sales Commitment (in Millions of British Thermal Units) | MMBTU	2.1		2.1
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal	50.3		50.3
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T	113,000		113,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb	13.5		13.5
Refined Coal [Member]
Commitments and Contingencies (Details) [Line Items]
Fees Incurred By Subsidiary | $	$ 2.0	$ 0.5	$ 5.1	$ 1.9