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COMMITMENTS (Details) lb in Millions, gal in Millions, bu in Millions | 12 Months Ended
--- | ---
Jan. 31, 2017 USD ($) T lb gal bu | Jan. 31, 2016 USD ($) bu | Jan. 31, 2015 USD ($)
COMMITMENTS (Details) [Line Items] |  |  |
Quantity of Bushels under Forward Purchase Contract (in US Bushels) | bu | 5.3 | 0.7 |
Operating Leases, Future Minimum Payments Due | $ 24,654,000 |  |
One Earth Energy And Nu Gen Energy [Member] |  |  |
COMMITMENTS (Details) [Line Items] |  |  |
Quantity of Bushels under Forward Purchase Contract (in US Bushels) | bu | 7.7 |  |
Quantity of Ethanol under Sales Commitment (in US Gallons) | gal | 59.7 |  |
Quantity of Distillers Grains Under Sales Commitment (in US Tons) | T | 67,000 |  |
Quantity of Non-food Grade Corn Oil Under Sales Commitments (in Pounds) | lb | 14.4 |  |
Supply Commitment Expected Period Of Delivery | They expect to deliver the ethanol, distillers grains and corn oil through June 2017. |  |
One Earth Energy And Nu Gen Energy [Member] | Railcars One [Member] |  |  |
COMMITMENTS (Details) [Line Items] |  |  |
Operating Leases, Rent Expense, Net | $ 8,515,000 | $ 7,221,000 | $ 7,024,000
Lease Expiration Date | Feb. 01, 2024 |  |
One Earth Energy And Nu Gen Energy [Member] | Distillers Grains Marketing Services [Member] |  |  |
COMMITMENTS (Details) [Line Items] |  |  |
Marketing Expense | $ 1,194,000 | $ 1,169,000 | $ 1,190,000
One Earth Energy [Member] |  |  |
COMMITMENTS (Details) [Line Items] |  |  |
Expiration Date of Grain Agreement | Oct. 31, 2016 |  |
Maximum Period to Notify Other Party for Grain Agreement Period Extension | 180 months |  |
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 |  |
Alliance Grain [Member] |  |  |
COMMITMENTS (Details) [Line Items] |  |  |
Percentage of Grain Purchase Under Agreement | 100.00% |  |

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