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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 ($)
Jul. 31, 2021
USD ($)
Jul. 31, 2022
MMBTU
T
lb
bu
gal
Commitments and Contingencies (Details) [Line Items]      
Fees Incurred By Subsidiary   $ 3.1  
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     12.3
Quantity Of Natural Gas Under Sales Commitment (in Millions of British Thermal Units) | MMBTU     1.1
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal     36.8
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T     82,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb     8.9
Refined Coal [Member]      
Commitments and Contingencies (Details) [Line Items]      
Fees Incurred By Subsidiary $ 2.2