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Commitments and Contingencies (Details)
lb in Millions, gal in Millions, bu in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Oct. 31, 2020
USD ($)
MMBTU
T
lb
bu
gal
Oct. 31, 2019
USD ($)
Oct. 31, 2020
USD ($)
MMBTU
T
lb
bu
gal
Oct. 31, 2019
USD ($)
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 6.2   6.2  
Quantity Of Natural Gas Under Sales Commitment (in Millions of British Thermal Units) | MMBTU 1,391,000   1,391,000  
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal 37.6   37.6  
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T 109,000   109,000  
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb 32.6   32.6  
Refined Coal [Member]        
Commitments and Contingencies (Details) [Line Items]        
Fees Incurred By Subsidiary | $ $ 0.5 $ 0.9 $ 1.9 $ 3.6