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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, 2019
USD ($)
MMBTU
T
lb
bu
gal
Oct. 31, 2018
USD ($)
Oct. 31, 2019
USD ($)
MMBTU
T
lb
bu
gal
Oct. 31, 2018
USD ($)
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 4.4   4.4  
Quantity Of Natural Gas Under Sales Commitment (in Millions of British Thermal Units) | MMBTU 1,067,000   1,067,000  
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal 18.9   18.9  
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T 48,500   48,500  
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb 6.1   6.1  
Refined Coal [Member]        
Commitments and Contingencies (Details) [Line Items]        
Fees Incurred By Subsidiary | $ $ 0.9 $ 2.6 $ 3.6 $ 7.7