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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
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.