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Commitments and Contingencies (Details) lb in Millions, gal in Millions, bu in Millions, $ in Millions	9 Months Ended
	Oct. 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	6.5
Quantity Of Natural Gas Under Sales Commitment \| MMBTU	2,732,000
Quantity of Ethanol under Sales Commitment \| gal	37.9
Quantity of Distillers Grains Under Sales Commitment \| T	109,000
Quantity of Non-food Grade Corn Oil Under Sales Commitments \| lb	19.1
Refined Coal [Member]
Commitments and Contingencies (Details) [Line Items]
Fees Incurred By Subsidiary \| $	$ 7.7