INVESTMENTS IN EQUITY INVESTEES - SCHEDULE OF EQUITY METHOD INVESTMENTS (Details) (USD $)	Jun. 30, 2014	Sep. 30, 2013
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	$ 152,512,000	$ 152,791,000
Steckman Ridge [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	128,255,000	129,707,000
Steckman Ridge [Member] | Equity Method Investee [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balance	70,400,000
Iroquois [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	$ 24,257,000	$ 23,084,000