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SEGMENT REPORTING (Detail) - Schedule of Segment Reporting Information, Profit Loss And Revenue Percentage (USD $)
 3 Months Ended 12 Months Ended
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2012
Oct. 31, 2011
Jul. 31, 2011
Apr. 30, 2011
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2011
Net sales and revenues $ 174,639,000 [1] $ 178,927,000 [1] $ 153,164,000 [1] $ 151,007,000 [1] $ 170,465,000 [1],[2] $ 84,499,000 [1] $ 73,796,000 [1] $ 81,163,000 [1] $ 657,737,000 $ 409,923,000 $ 235,545,000
Gross profit (2,569,000) [1] 3,632,000 [1] 6,952,000 [1] 5,521,000 [1] 20,469,000 [1],[2] 9,002,000 [1] (214,000) [1] 4,745,000 [1] 13,536,000 34,002,000 33,555,000
(Loss) income from continuing operations before income taxes                 (3,856,000) 48,014,000 34,645,000
Interest expense                 4,870,000 3,459,000 2,935,000
Interest income                 166,000 416,000 436,000
Depreciation and amortization expense                 16,560,000 12,004,000 11,758,000
Equity in income of unconsolidated affiliates                 627,000 21,532,000 14,558,000
Income from synthetic fuel investments                   2,883,000  
Ethanol [Member] | Alternative Energy Segment [Member]
                      
Sale of Product                 76.00% 82.00% 83.00%
Dried Distillers Grains [Member] | Alternative Energy Segment [Member]
                      
Sale of Product                 18.00% 17.00% 17.00%
Modified Distillers Grains [Member] | Alternative Energy Segment [Member]
                      
Sale of Product                 4.00% 1.00%  
Other Products [Member] | Alternative Energy Segment [Member]
                      
Sale of Product                 2.00%    
Alternative Energy Segment [Member]
                      
Net sales and revenues                 656,167,000 408,635,000 234,545,000
Gross profit                 13,830,000 35,179,000 33,842,000
(Loss) income from continuing operations before income taxes                 (1,027,000) 48,580,000 37,682,000
Sale of Product                 100.00% 100.00% 100.00%
Interest income                 37,000 48,000 68,000
Depreciation and amortization expense                 16,073,000 11,653,000 11,315,000
Equity in income of unconsolidated affiliates                 627,000 21,532,000 14,558,000
Real Estate Segment [Member]
                      
Net sales and revenues                 1,570,000 1,288,000 1,000,000
Gross profit                 (294,000) (1,177,000) (287,000)
(Loss) income from continuing operations before income taxes                 (511,000) (1,376,000) (467,000)
Leasing                 100.00% 100.00% 100.00%
Interest income                 42,000 48,000 39,000
Depreciation and amortization expense                 487,000 351,000 261,000
Corporate [Member]
                      
(Loss) income from continuing operations before income taxes                 (2,340,000) (2,307,000) (2,724,000)
Interest expense                 (65,000) (86,000) (175,000)
Interest income                 87,000 320,000 329,000
Income from synthetic fuel investments                   2,883,000  
Unallocated Amount to Segment [Member]
                      
Interest income                 87,000 320,000 329,000
Depreciation and amortization expense                     $ 182,000
[1] Amounts differ from those previously reported as a result of retail operations and certain real estate assets sold being reclassified as discontinued operations and other reclassifications.
[2] The quarter ended January 31, 2012 includes the results of NuGen in the consolidated information. Effective November 1, 2011, the Company ceased using the equity method to account for NuGen and began consolidating NuGen's results.