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
	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%