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Schedule I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY (Detail) - CONDENSED STATEMENTS OF OPERATIONS PARENT COMPANY ONLY (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 revenue | $ 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
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 644,201,000 | 375,921,000 | 201,990,000
Gross loss | (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
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,545,000) | (10,377,000) | (8,810,000)
Bargain purchase gain, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,990,000 | 3,541,000 |
Income from synthetic fuel investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,883,000 |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166,000 | 416,000 | 436,000
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,870,000) | (3,459,000) | (2,935,000)
Loss on early termination of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (370,000) | (1,148,000) | (2,116,000)
Other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80,000 | 625,000 | 5,000
(Loss) income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,856,000) | 48,014,000 | 34,645,000
Benefit (provision) for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,639,000 | (15,957,000) | (12,358,000)
(Loss) income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,217,000) | 32,057,000 | 22,287,000
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 1,206,000 | (13,706,000)
Gain on disposal of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,000 | 435,000 | 161,000
Net (loss) income | (5,262,000) |  | 893,000 |  | 1,289,000 |  | 1,492,000 |  | 17,782,000 | [2] | 8,327,000 |  | 2,033,000 |  | 5,556,000 |  | (1,588,000) | 33,698,000 | 8,742,000
Parent Company [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net sales and revenue |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,570,000 | 1,288,000 | 1,000,000
Cost of sales |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,864,000 | 2,465,000 | 1,287,000
Gross loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (294,000) | (1,177,000) | (287,000)
Selling, general and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,897,000) | (6,053,000) | (5,438,000)
Equity in (loss) income of consolidated and unconsolidated ethanol affiliates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,451,000) | 43,100,000 | 33,762,000
Bargain purchase gain, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,541,000 |
Income from synthetic fuel investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,883,000 |
Interest income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,000 | 369,000 | 1,173,000
Interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (65,000) | (85,000) | (127,000)
Loss on early termination of debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,000) | (48,000)
Other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000 | 9,000 | 5,000
(Loss) income from continuing operations before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,568,000) | 42,586,000 | 29,040,000
Benefit (provision) for income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,644,000 | (15,957,000) | (12,210,000)
(Loss) income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (2,924,000) | 26,629,000 | 16,830,000
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 500,000 | 1,206,000 | (11,924,000)
Gain on disposal of discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 129,000 | 435,000 | 163,000
Net (loss) income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (2,295,000) | $ 28,270,000 | $ 5,069,000
[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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