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Long Term Debt and Interest Rate Swaps (Detail) (USD $)
 3 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 3 Months Ended
Apr. 30, 2013
Jan. 31, 2013
Apr. 30, 2013
Interest Rate Swap One [Member]
One Earth Energy [Member]
Jul. 31, 2009
Interest Rate Swap One [Member]
One Earth Energy [Member]
Apr. 30, 2013
Interest Rate Swap [Member]
One Earth Energy [Member]
Jan. 31, 2013
Interest Rate Swap [Member]
One Earth Energy [Member]
Apr. 30, 2013
Interest Rate Swap [Member]
Apr. 30, 2013
One Earth Energy [Member]
Minimum [Member]
Term Loan [Member]
Apr. 30, 2013
One Earth Energy [Member]
Minimum [Member]
Apr. 30, 2013
One Earth Energy [Member]
Maximum [Member]
Term Loan [Member]
Apr. 30, 2013
One Earth Energy [Member]
Maximum [Member]
Jan. 31, 2008
One Earth Energy [Member]
Construction Loans [Member]
Apr. 30, 2013
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]
Apr. 30, 2013
One Earth Energy [Member]
Term Loan [Member]
Jan. 31, 2013
One Earth Energy [Member]
Term Loan [Member]
Apr. 30, 2013
One Earth Energy [Member]
Oct. 31, 2009
One Earth Energy [Member]
Jan. 31, 2008
One Earth Energy [Member]
Apr. 30, 2013
First National Bank [Member]
Apr. 30, 2013
Nu Gen Energy [Member]
Minimum [Member]
Apr. 30, 2013
Nu Gen Energy [Member]
Maximum [Member]
Apr. 30, 2013
Nu Gen Energy [Member]
Revolving Credit Facility [Member]
Jan. 31, 2012
Nu Gen Energy [Member]
Revolving Credit Facility [Member]
Apr. 30, 2013
Nu Gen Energy [Member]
Term Loan [Member]
Jan. 31, 2012
Nu Gen Energy [Member]
Term Loan [Member]
Jan. 31, 2013
Nu Gen Energy [Member]
Term Loan [Member]
Apr. 30, 2013
Nu Gen Energy [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]
Proceeds from Bank Debt                       $ 100,000,000   $ 10,000,000 $ 1,000,000         $ 111,000,000       $ 10,000,000 $ 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                              
Debt Instrument, Description of Variable Rate Basis                               LIBOR plus 280 basis points to LIBOR plus 300 basis points                   LIBOR plus 325 basis points              
Debt Instrument, Interest Rate at Period End               3.10%   3.30%                                              
Debt Instrument, Frequency of Periodic Payment                                     19 quarterly payments                   19 quarterly payments        
Long Term Debt Principal Portion Amortization Schedule                                     120 months             120 months              
Debt Instrument, Maturity Date                         May 31, 2014     Jul. 31, 2014               May 31, 2014   Oct. 31, 2016              
Debt Instrument Principal Payments as Percentage of Annual Excess Cash Flows                               20.00%                   40.00%              
Debt Instrument, Annual Principal Payment                               6,000,000                   5,000,000              
Long-term Debt, Gross                               55,400,000                   46,800,000              
Fixed Charge Coverage Ratio                 1.00%   1.10%                     1.00% 1.10%                    
Period Of Loan Agreement To Maintain Compliance With Covenants                                         12 months                        
Payments of Financing Costs                               1,400,000                   600,000              
Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries                               78,900,000 77,900,000                 51,300,000   49,500,000          
Line of Credit Facility, Amount Outstanding                         0                     0                  
Line of Credit Facility, Maximum Borrowing Capacity                         10,000,000                                        
Derivative Liability, Notional Amount       50,000,000     36,759,000                                                    
Swap Termination Date     July 8, 2014                                                            
Debt Instrument, Basis Spread on Variable Rate (in Basis Points)     7.90%                                             3.25%              
Derivative Liability 2,345,000 2,789,000     2,300,000 2,800,000 2,345,000                                                    
Debt Instrument Libor Floor Rate                                                   4.00%              
Minimum Working Capital Regarding Modification Of The Covenant                                                         $ 7,500,000   $ 10,000,000 $ 7,500,000 $ 7,500,000