INVESTMENTS IN EQUITY INVESTEES - SCHEDULE OF EQUITY METHOD INVESTMENTS (Details) (USD $)	Jun. 30, 2013	Sep. 30, 2012
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	$ 154,630,000	$ 155,795,000
Steckman Ridge [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	130,715,000	132,931,000
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	$ 23,915,000	$ 22,864,000