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SEGMENT REPORTING (Detail) - Schedule of Segment Reporting Information, Profit Loss And Revenue Percentage (USD $) | 3 Months Ended | 12 Months Ended
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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.

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