BUSINESS COMBINATIONS (Details) (USD $)	12 Months Ended		24 Months Ended
	Jan. 31, 2014	Jan. 31, 2012	Jan. 31, 2013	Nov. 30, 2011 gal
BUSINESS COMBINATIONS (Details) [Line Items]
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
Payments to Acquire Businesses, Gross	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 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	3,500,000
Market Approach Valuation Technique [Member] | NuGen [Member]
BUSINESS COMBINATIONS (Details) [Line Items]
Business Acquisition, Purchase Price Allocation, Property Plant And Equipment, Carrying Value		83,000,000
Business Acquisition, Purchase Price Allocation, Property Plant And Equipment, Fair Value		42,900,000
Income Approach Valuation Technique [Member] | NuGen [Member]
BUSINESS COMBINATIONS (Details) [Line Items]
Business Acquisition, Purchase Price Allocation, Property Plant And Equipment, Carrying Value		74,200,000
Business Acquisition, Purchase Price Allocation, Property Plant And Equipment, Fair Value		35,600,000
Fair Value Inputs, Discount Rate		23.00%
NuGen [Member]
BUSINESS COMBINATIONS (Details) [Line Items]
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
Payments to Acquire Businesses, Gross		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, Carrying Value		78,600,000
Business Acquisition, Purchase Price Allocation, Property Plant And Equipment, Fair Value		39,000,000
Business Combination, Bargain Purchase, Gain Recognized, Amount			$ 8,900,000