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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