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INVESTMENTS IN EQUITY INVESTEES (Details) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2020 USD ($) mi | Sep. 30, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | $ 208,375 | $ 200,268
Deferred tax gross up | 4,600 | 4,100
Steckman Ridge |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | 112,378 | 114,428
Outstanding principal balance | $ 70,400 | 70,400
Ownership interest, percent | 50.00% |
PennEast |  |
Schedule of Equity Method Investments [Line Items] |  |
Investments in equity investees | $ 95,997 | $ 85,840
Ownership interest, percent | 20.00% |
Construction plan, pipeline distance (in miles) | mi | 120 |
NJR Pipeline | PennEast |  |
Schedule of Equity Method Investments [Line Items] |  |
Ownership interest, percent | 20.00% |

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