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Commitments and Contingencies (Details) lb in Millions, gal in Millions, bu in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jul. 31, 2021 USD ($) MMBTU T lb bu gal	Jul. 31, 2020 USD ($)	Jul. 31, 2021 USD ($) MMBTU T lb bu gal	Jul. 31, 2020 USD ($)
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	10.6		10.6
Quantity Of Natural Gas Under Sales Commitment (in Millions of British Thermal Units) \| MMBTU	639,000		639,000
Quantity of Ethanol under Sales Commitment (in US Gallons) \| gal	31.7		31.7
Quantity of Distillers Grains Under Sales Commitment (in US Tons) \| T	46,000		46,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) \| lb	9.6		9.6
Refined Coal [Member]
Commitments and Contingencies (Details) [Line Items]
Fees Incurred By Subsidiary \| $	$ 2.2	$ 1.1	$ 3.1	$ 1.4