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Commitments and Contingencies (Details)
lb in Millions, gal in Millions, bu in Millions, $ in Millions
 6 Months Ended
Jul. 31, 2018
USD ($)
MMBTU
T
lb
bu
gal
One Earth Energy And Nu Gen Energy [Member]  
Commitments and Contingencies (Details) [Line Items]  
Quantity of Bushels under Forward Purchase Contract | bu 11.5
Quantity Of Natural Gas Under Sales Commitment | MMBTU 1,936,000
Quantity of Ethanol under Sales Commitment | gal 17.9
Quantity of Distillers Grains Under Sales Commitment | T 62,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments | lb 10.2
Refined Coal [Member]  
Commitments and Contingencies (Details) [Line Items]  
Fees Incurred By Subsidiary | $ $ 5.1