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INVESTMENTS IN EQUITY INVESTEES (Details) $ in Thousands | 9 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) mi | Sep. 30, 2018 USD ($)
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | $ 197,660 | $ 190,866
Steckman Ridge |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | 115,419 | 117,001
Total outstanding principal balance of loans | 70,400 | 70,400
PennEast |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | $ 82,241 | $ 73,865
Construction plan, project area (in miles) | mi | 120 |

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