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Long Term Debt and Interest Rate Swaps (Detail) (USD $)
 3 Months Ended 6 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jul. 31, 2012
Jul. 31, 2012
Interest Rate Swap One [Member]
One Earth Energy [Member]
Jul. 31, 2009
Interest Rate Swap One [Member]
One Earth Energy [Member]
Jul. 31, 2012
Interest Rate Swap Two [Member]
One Earth Energy [Member]
Jul. 31, 2009
Interest Rate Swap Two [Member]
One Earth Energy [Member]
Jul. 31, 2012
Interest Rate Swap [Member]
One Earth Energy [Member]
Jan. 31, 2012
Interest Rate Swap [Member]
One Earth Energy [Member]
Jul. 31, 2012
Interest Rate Swap [Member]
Jan. 31, 2008
One Earth Energy [Member]
Construction Loans [Member]
Jul. 31, 2012
One Earth Energy [Member]
Revolving Credit Facility [Member]
Jan. 31, 2008
One Earth Energy [Member]
Revolving Credit Facility [Member]
Jan. 31, 2008
One Earth Energy [Member]
Letter of Credit [Member]
Jul. 31, 2012
One Earth Energy [Member]
Term Loan [Member]
Jul. 31, 2012
One Earth Energy [Member]
Term Loan [Member]
Jan. 31, 2012
One Earth Energy [Member]
Term Loan [Member]
Jul. 31, 2012
One Earth Energy [Member]
Jan. 31, 2008
One Earth Energy [Member]
Jan. 31, 2012
NuGen Energy [Member]
Revolving Credit Facility [Member]
Jan. 31, 2012
NuGen Energy [Member]
Term Loan [Member]
Jul. 31, 2012
NuGen Energy [Member]
Term Loan [Member]
Jan. 31, 2012
NuGen Energy [Member]
Proceeds from Bank Debt                 $ 100,000,000   $ 10,000,000 $ 1,000,000         $ 111,000,000 $ 10,000,000 $ 55,000,000   $ 65,000,000
Debt Conversion, Original Debt, Type of Debt                               The construction loan was converted into a term loan on July 31, 2009 as all of the requirements, for such conversion, of the construction and term loan agreement were fulfilled.          
Debt Instrument, Description of Variable Rate Basis                           The term loan bears interest at variable interest rates ranging from LIBOR plus 280 basis points to LIBOR plus 300 basis points (3.4% -3.5% at July 31, 2012).           The term loan bears interest at variable interest rate of LIBOR plus 325 basis points, subject to a 4% floor (4% at July 31, 2012).  
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum                         3.40%                
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum 3.50%                                        
Debt Instrument, Payment Terms                           Beginning with the first quarterly payment on October 8, 2009, payments are due in 19 quarterly payments of principal plus accrued interest with the principal portion calculated based on a 120 month amortization schedule. One final installment will be required on the maturity date (July 31, 2014) for the remaining unpaid principal balance with accrued interest. Principal payments equal to 20% of annual excess cash flows are also due. Such payments cannot exceed $6 million in a year.           Beginning with the first quarterly payment on February 1, 2012, payments are due in 19 quarterly payments of principal plus accrued interest with the principal portion calculated based on a 120 month amortization schedule. One final installment will be required on the maturity date (October 31, 2016) for the remaining unpaid principal balance with accrued interest. Principal payments equal to 40% of annual excess cash flows are also due. Such payments cannot exceed $5 million in a year.  
Debt Instrument, Maturity Date                   May 29, 2013       Jul. 31, 2014           Oct. 31, 2016  
Debt Instrument, Annual Principal Payment                         6,000,000 6,000,000           5,000,000  
Long-term Debt, Gross                         60,900,000 60,900,000           50,900,000  
Debt Instrument, Restrictive Covenants                           One Earth is also subject to certain financial covenants under the loan agreement, including required levels of EBITDA, debt service coverage ratio requirements and working capital requirements. One Earth was in compliance with these covenants, as applicable, at July 31, 2012.           NuGen is also subject to certain financial covenants under the loan agreement, including required levels of EBITDA, debt service coverage ratio requirements and working capital requirements. NuGen was in compliance with these covenants, as applicable, at July 31, 2012.  
Payments of Financing Costs                           1,400,000           600,000  
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries                         77,500,000 77,500,000 70,200,000       50,400,000 54,400,000  
Derivative Liability, Notional Amount     50,000,000   25,000,000     39,859,000                          
Swap Termination Date   July 8, 2014   July 31, 2011                                  
Debt Instrument, Basis Spread on Variable Rate   7.90%   5.49%                                  
Derivative Liabilities           $ 3,500,000 $ 4,200,000                            
Debt Instrument, Interest Rate, Stated Percentage                                       4.00%