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INVESTMENTS AND DEPOSITS (Detail) (USD $)	12 Months Ended								12 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2013 Big River [Member] Burlington [Member] gal	Jan. 31, 2013 Big River [Member] Illinois [Member] gal	Jan. 31, 2013 Big River [Member] Dyersville [Member] gal	Jan. 31, 2013 Big River [Member] WISCONSIN gal	Jan. 31, 2013 Big River [Member] Big River Resources Galva LLC [Member]	Jan. 31, 2013 Big River [Member]	Jan. 31, 2012 Big River [Member]	Jan. 31, 2011 Big River [Member]	Jan. 31, 2013 Patriot [Member] Illinois [Member] gal	Jan. 31, 2013 Patriot [Member]	Jan. 31, 2012 Patriot [Member]	Jan. 31, 2011 Patriot [Member]	Jan. 31, 2012 Nu Gen Energy [Member]	Jan. 31, 2011 Nu Gen Energy [Member]	Jan. 31, 2013 Nu Gen Energy [Member]	Nov. 30, 2011 Nu Gen Energy [Member]	Jul. 30, 2010 Nu Gen Energy [Member]	Jan. 31, 2013 Patriot And Big River [Member]	Jan. 31, 2012 Patriot And Big River [Member]	Jan. 31, 2013 Money Market Funds [Member]	Jan. 31, 2012 Money Market Funds [Member]
Restricted Investments	$ 203,000	$ 743,000
Money Market Mutual Fund Fair Value Disclosure																							300,000	620,000
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 (in US Gallons)				96,000,000	104,000,000	104,000,000	57,000,000					118,000,000
Income (Loss) from Equity Method Investments	627,000	21,532,000	14,558,000						274,000	6,931,000	5,387,000		353,000	5,274,000	5,159,000	9,327,000	4,011,000
Proceeds from Equity Method Investment, Dividends or Distributions									2,200,000	2,000,000	1,600,000		0	1,600,000	1,600,000
Equity Method Investments	59,959,000	61,679,000							32,438,000	34,370,000			27,521,000	27,309,000
Equity Method Investment, Underlying Equity in Net Assets									30,900,000					26,300,000
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	21,200,000	22,800,000
Proportionate Share of Restricted Net Assets																					$ 367,600,000	$ 52,900,000

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