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Commitments (Details)
lb in Millions, gal in Millions, bu in Millions
 12 Months Ended
Jan. 31, 2019
USD ($)
T
lb
gal
bu
Jan. 31, 2018
USD ($)
Jan. 31, 2017
USD ($)
One Earth Energy And Nu Gen Energy [Member]      
Commitments (Details) [Line Items]      
Forward Purchase Contracts, Quantity (in US Bushels) | bu 13.0    
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal 32.3    
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T 88,000    
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb 18.2    
Supply Commitment Expected Period Of Delivery They expect to deliver the ethanol, distillers grains and corn oil through March 2019.    
One Earth Energy And Nu Gen Energy [Member] | Railcars One [Member]      
Commitments (Details) [Line Items]      
Operating Leases, Rent Expense, Net $ 8,109,000 $ 8,600,000 $ 8,515,000
One Earth Energy And Nu Gen Energy [Member] | Distillers Grains Marketing Services [Member]      
Commitments (Details) [Line Items]      
Marketing Expense $ 1,250,000 1,354,000 1,194,000
One Earth Energy [Member] | Natural Gas Pipeline [Member]      
Commitments (Details) [Line Items]      
Lease Expiration Period 10 years    
Operating Leases, Future Minimum Payments Due $ 4,380,000    
Number of installments payable 120    
Installment amount $ 36,500    
Operating Leases, Rent Expense, Net $ 438,000 438,000 $ 438,000
One Earth Energy [Member] | Renewal [Member] | Natural Gas Pipeline [Member]      
Commitments (Details) [Line Items]      
Lease Expiration Period 15 years    
Installment amount $ 29,250    
Alliance Grain [Member]      
Commitments (Details) [Line Items]      
Percentage of Grain Purchase Under Agreement 100.00%    
Expiration Date of Grain Agreement Dec. 31, 2020    
Maximum Period to Notify Other Party for Grain Agreement Period Extension 180 days    
Refined Coal [Member]      
Commitments (Details) [Line Items]      
Fees Incurred By Subsidiary $ 9,900,000 $ 5,500,000