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LONG-TERM DEBT AND INTEREST RATE SWAPS (Detail) (USD $) | 12 Months Ended |  | 12 Months Ended |  |  |  |  |  |  | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  |  |
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Jan. 31, 2013 | Jan. 31, 2012 | Jan. 31, 2013 Interest Rate Swap One [Member] One Earth Energy [Member] | Jul. 31, 2009 Interest Rate Swap One [Member] One Earth Energy [Member] | Jan. 31, 2013 Interest Rate Swap Two [Member] One Earth Energy [Member] | Jul. 31, 2009 Interest Rate Swap Two [Member] One Earth Energy [Member] | Jan. 31, 2013 Interest Rate Swap [Member] One Earth Energy [Member] | Jan. 31, 2012 Interest Rate Swap [Member] One Earth Energy [Member] | Jan. 31, 2013 Interest Rate Swap [Member] | Jan. 31, 2012 Interest Rate Swap [Member] | Jan. 31, 2013 Minimum [Member] One Earth Energy [Member] Term Loan [Member] | Jan. 31, 2013 Minimum [Member] One Earth Energy [Member] Revolving Credit Facility [Member] | Jan. 31, 2013 Minimum [Member] One Earth Energy [Member] | Jan. 31, 2013 Minimum [Member] Nu Gen Energy [Member] | Jan. 31, 2013 Maximum [Member] One Earth Energy [Member] Term Loan [Member] | Jan. 31, 2013 Maximum [Member] One Earth Energy [Member] | Jan. 31, 2013 Maximum [Member] Nu Gen Energy [Member] | Jan. 31, 2013 One Earth Energy [Member] Term Loan [Member] | Jan. 31, 2012 One Earth Energy [Member] Term Loan [Member] | Jan. 31, 2013 One Earth Energy [Member] Revolving Credit Facility [Member] | Jan. 31, 2012 One Earth Energy [Member] Revolving Credit Facility [Member] | Oct. 31, 2009 One Earth Energy [Member] | Jan. 31, 2013 First National Bank [Member] | Jan. 31, 2012 Nu Gen Energy [Member] Term Loan [Member] | Jan. 31, 2013 Nu Gen Energy [Member] Term Loan [Member] | Jan. 31, 2012 Nu Gen Energy [Member] Revolving Credit Facility [Member] | Jan. 31, 2013 Nu Gen Energy [Member] Revolving Credit Facility [Member] | Jan. 31, 2012 Nu Gen Energy [Member] | Jan. 31, 2014 Nu Gen Energy [Member] | Oct. 31, 2013 Nu Gen Energy [Member] | Jul. 31, 2013 Nu Gen Energy [Member] | Apr. 30, 2013 Nu Gen Energy [Member] | Jan. 31, 2013 Nu Gen Energy [Member]
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum | 3.20% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum |  | 8.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Maturities, Repayment Terms | range up to 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Fair Value | $ 107,000,000 | $ 123,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Frequency of Periodic Payment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19 quarterly payments |  |  |  |  |  |  |  |  |  |  |
Long Term Debt Principal Portion Amortization Schedule |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120 months |  |  | 120 months |  |  |  |  |  |  |  |
Debt Instrument, Maturity Date |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Jul. 31, 2014 |  | May 29, 2013 |  |  |  |  | Oct. 31, 2016 |  |  |  |  |  |  |  |
Debt Instrument, Description of Variable Rate Basis |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | LIBOR plus 280 basis points to LIBOR plus 300 basis points |  | LIBOR plus 280 basis points |  |  |  |  | LIBOR plus 325 basis points |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate (in Basis Points) |  |  | 7.90% |  | 5.49% |  |  |  |  |  |  | 2.80% |  |  | 3.00% |  |  |  |  | 2.80% |  |  |  |  | 3.25% |  |  |  |  |  |  |  |
Debt Instrument, Interest Rate at Period End |  |  |  |  |  |  |  |  |  |  | 3.20% |  |  |  | 3.40% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,200,000 | 69,100,000 |  |  |  |  | 53,600,000 | 48,100,000 |  |  |  |  |  |  |  |
Fixed Charge Coverage Ratio |  |  |  |  |  |  |  |  |  |  |  |  | 1.10% | 1.10% |  | 1.00% | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Period Of Loan Agreement To Maintain Compliance With Covenants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 12 months |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 |  |  |  |  |  | 0 |  |  |  |  |  |
Payments of Financing Costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,400,000 |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |  |
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 77,900,000 |  |  |  |  |  |  | 49,500,000 |  |  |  |  |  |  |  |
Derivative Liability, Notional Amount | 37,800,000 |  |  | 50,000,000 |  | 25,000,000 |  |  | 37,811,000 | 41,824,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Swap Termination Date |  |  | July 8, 2014 |  | July 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 7.90% |  | 5.49% |  |  |  |  |  |  | 2.80% |  |  | 3.00% |  |  |  |  | 2.80% |  |  |  |  | 3.25% |  |  |  |  |  |  |  |
Derivative Liabilities |  |  |  |  |  |  | 2,800,000 | 4,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from Bank Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 55,000,000 |  | 10,000,000 | 10,000,000 | 65,000,000 |  |  |  |  |
Debt Instrument Libor Floor Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.00% |  |  |  |  |  |  |  |
Minimum Working Capital Regarding Modification Of The Covenant |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 10,000,000 | $ 7,500,000 | $ 7,500,000 | $ 7,500,000 |
Restricted Investments, Percent of Net Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73.20%
Restricted Investments Percentage of Net Assets Including Only Consolidated Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.70%

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- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
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