INVESTMENTS IN EQUITY INVESTEES (Details) (USD $)	Mar. 31, 2012	Sep. 30, 2011
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	$ 157,049,000	$ 159,063,000
Steckman Ridge [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	134,703,000	135,130,000
Iroquois [Member]
Schedule of Equity Method Investments [Line Items]
Investments in equity investees	22,346,000	23,933,000
Equity Method Investee [Member] | Steckman Ridge [Member]
Schedule of Equity Method Investments [Line Items]
Outstanding principal balance	$ 70,400,000