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INVESTMENTS IN EQUITY INVESTEES (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2015 USD ($) mi | Sep. 30, 2015 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in equity investees |  | $ 134,280 | $ 132,002
Steckman Ridge [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in equity investees | [1] | 125,058 | 125,649
Steckman Ridge [Member] | Equity Method Investee [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Total outstanding principal balance of loans |  | 70,400 | 70,400
PennEast [Member] |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in equity investees |  | $ 9,222 | $ 6,353
Construction plan, project area (in miles) | mi |  | 118 |
[1] | Includes loans with a total outstanding principal balance of $70.4 million for both December 31, 2015 and September 30, 2015. The loans accrue interest at a variable rate that resets quarterly and are due October 1, 2023.

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