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COMMITMENTS (Details)
lb in Millions, gal in Millions, bu in Millions
 12 Months Ended
Jan. 31, 2018
USD ($)
T
lb
gal
bu
Jan. 31, 2017
USD ($)
Jan. 31, 2016
USD ($)
COMMITMENTS (Details) [Line Items]      
Operating Leases, Future Minimum Payments Due $ 26,003,000    
One Earth Energy And Nu Gen Energy [Member]      
COMMITMENTS (Details) [Line Items]      
Forward Purchase Contracts, Quantity (in US Bushels) | bu 14.1    
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal 29.4    
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T 118,000    
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb 12.8    
Supply Commitment Expected Period Of Delivery They expect to deliver the ethanol, distillers grains and corn oil through March 2018.    
Alliance Grain [Member]      
COMMITMENTS (Details) [Line Items]      
Percentage of Grain Purchase Under Agreement 100.00%    
Expiration Date of Grain Agreement Oct. 31, 2018    
Maximum Period to Notify Other Party for Grain Agreement Period Extension 180 days    
Refined Coal [Member]      
COMMITMENTS (Details) [Line Items]      
Fees Incurred By Subsidiary $ 5,500,000    
Natural Gas Pipeline [Member] | One Earth Energy [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
Natural Gas Pipeline [Member] | One Earth Energy [Member] | Renewal [Member]      
COMMITMENTS (Details) [Line Items]      
Lease Expiration Period 15 years    
Installment amount $ 29,250    
Railcars One [Member] | One Earth Energy And Nu Gen Energy [Member]      
COMMITMENTS (Details) [Line Items]      
Operating Leases, Rent Expense, Net $ 8,600,000 8,515,000 7,221,000
Lease Expiration Date Feb. 01, 2024    
Distillers Grains Marketing Services [Member] | One Earth Energy And Nu Gen Energy [Member]      
COMMITMENTS (Details) [Line Items]      
Marketing Expense $ 1,354,000 $ 1,194,000 $ 1,169,000