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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, 2020
USD ($)
MMBTU
T
lb
bu
gal
Jul. 31, 2019
USD ($)
Jul. 31, 2020
USD ($)
MMBTU
T
lb
bu
gal
Jul. 31, 2019
USD ($)
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 6.8   6.8  
Quantity Of Natural Gas Under Sales Commitment (in Millions of British Thermal Units) | MMBTU 1,647,000   1,647,000  
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal 21.8   21.8  
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T 32,000   32,000  
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb 5.2   5.2  
Refined Coal [Member]        
Commitments and Contingencies (Details) [Line Items]        
Fees Incurred By Subsidiary | $ $ 1.1 $ 1.2 $ 1.4 $ 2.8