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BUSINESS COMBINATIONS (Detail) (USD $) | 12 Months Ended |
--- | --- | ---
Jan. 31, 2013 | Jan. 31, 2012 | Nov. 30, 2011 gal
Annual Nameplate Capacity of Ethanol In Gallons (in US Gallons) |  |  | 100,000,000
Business Acquisition, Pro Forma Revenue |  | $ 684,615,000 |
Business Acquisition, Pro Forma Net Income (Loss) |  | 34,939,000 |
Business Acquisition, Cost of Acquired Entity, Cash Paid | 10,413,000 |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value | 18,642,000 |  |
Equity Method Investment, Ownership Percentage |  | 48.00% |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Loss |  | 5,400,000 |
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment | 78,618,000 |  |
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net | 39,000,000 |  |
Business Acquisition Cost of Acquired Entity Purchase Price For Additional Equity Interest |  | 10,400,000 |
Business Acquisition Additional Percentage of Voting Interest |  | 50.00% |
Business Combination, Bargain Purchase, Gain Recognized, Amount | 8,990,000 | 3,541,000 |
Market Approach Valuation Technique [Member] | NuGen [Member] |  |  |
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment |  | 83,000,000 |
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net |  | 42,900,000 |
Income Approach Valuation Technique [Member] | NuGen [Member] |  |  |
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment |  | 74,200,000 |
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net |  | 35,600,000 |
Fair Value Inputs, Discount Rate |  | 23.00% |
NuGen [Member] |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  | 50.00%
Noncontrolling Interest, Ownership Percentage by Parent |  |  | 98.00%
Business Acquisition, Pro Forma Revenue |  | 84,100,000 |
Business Acquisition, Pro Forma Net Income (Loss) |  | 4,000,000 |
Business Acquisition, Cost of Acquired Entity, Cash Paid |  | 10,400,000 |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value |  | 18,600,000 |
Equity Method Investment, Ownership Percentage |  | 48.00% |
Business Combination Step Acquisition Equity Interest In Acquiree Carrying Value |  | 24,000,000 |
Business Acquisition, Purchase Price Allocation, Property, Plant and Equipment |  | 78,600,000 |
Business Acquisition, Purchase Price Allocation, Assets Acquired (Liabilities Assumed), Net |  | 39,000,000 |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  | $ 8,900,000 |

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