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INVESTMENTS AND DEPOSITS (Details) (USD $) | 12 Months Ended |  | 12 Months Ended | 24 Months Ended | 12 Months Ended |  |  |  |
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Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2014 Big River [Member] Big River Resources Galva LLC [Member] | Jan. 31, 2014 Big River [Member] Burlington [Member] gal | Jan. 31, 2014 Big River [Member] Illinois [Member] gal | Jan. 31, 2014 Big River [Member] Dyersville [Member] l | Jan. 31, 2014 Big River [Member] WISCONSIN gal | Jan. 31, 2014 Big River [Member] | Jan. 31, 2013 Big River [Member] | Jan. 31, 2012 Big River [Member] | Jan. 31, 2014 Patriot [Member] Illinois [Member] gal | Jan. 31, 2014 Patriot [Member] | Jan. 31, 2013 Patriot [Member] | Jan. 31, 2012 Patriot [Member] | Jan. 31, 2013 Patriot [Member] | Jan. 31, 2012 Nu Gen Energy [Member] | Jan. 31, 2014 Nu Gen Energy [Member] | Nov. 30, 2011 Nu Gen Energy [Member] | Jul. 30, 2010 Nu Gen Energy [Member] | Jan. 31, 2014 Patriot And Big River [Member]
INVESTMENTS AND DEPOSITS (Details) [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Agreement to Invest During Year |  |  |  |  |  |  |  |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  | 48.00% | 50.50% |  |  |  |  | 10.00% |  |  |  | 27.00% |  |  |  |  |  |  |  |
Quantity of ethanol shipped |  |  |  |  | 104,000,000 | 113,000,000 | 117,000,000 | 56,000,000 |  |  |  | 121,000,000 |  |  |  |  |  |  |  |  |
Income (Loss) from Equity Method Investments | 17,175,000 | 627,000 | 21,532,000 |  |  |  |  |  | 8,800,000 | 300,000 | 6,900,000 |  | 8,400,000 | 400,000 | 5,300,000 |  | 9,300,000 |  |  |  |
Proceeds from Equity Method Investment, Dividends or Distributions |  |  |  |  |  |  |  |  | 1,200,000 | 2,200,000 | 2,000,000 |  | 4,600,000 |  |  | 1,600,000 |  |  |  |  |
Equity Method Investments | 71,189,000 | 59,959,000 |  |  |  |  |  |  | 40,042,000 | 32,438,000 |  |  | 31,147,000 | 27,521,000 |  | 27,521,000 |  |  |  |  |
Equity Method Investment, Underlying Equity in Net Assets |  |  |  |  |  |  |  |  | 38,700,000 |  |  |  | 30,200,000 |  |  |  |  |  |  |  |
Equity Method Initial Investments |  |  |  |  |  |  |  |  |  |  |  |  | 16,000,000 |  |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99.00% | 50.00% | 48.00% |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100.00% |  |  |
Retained Earnings, Undistributed Earnings from Equity Method Investees | 32,600,000 | 21,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other Restricted Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 366,200,000
Proportionate Share of Restricted Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51,700,000

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