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INVESTMENTS IN EQUITY INVESTEES (Details) $ in Thousands |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 30, 2020 phase mi | Jun. 30, 2020 USD ($) mi | Sep. 30, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in equity investees |  | $ 205,800 | $ 200,268
Deferred tax gross up |  | $ 4,600 | 4,100
PennEast | NJR Pipeline |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Ownership percentage |  | 20.00% |
Steckman Ridge |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in equity investees |  | $ 112,909 | 114,428
Total outstanding principal balance of loans |  | $ 70,400 | 70,400
Ownership percentage |  | 50.00% |
PennEast |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |
Investments in equity investees |  | $ 92,891 | $ 85,840
Ownership percentage |  | 20.00% |
Construction plan, project area (in miles) | mi | 68 | 120 |
Number of phases | phase | 2 |  |

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