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INVESTMENTS IN EQUITY INVESTEES (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 30, 2020 phase mi | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) mi | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments in equity investees |  | $ 117,016 |  | $ 117,016 |  | $ 208,375
Deferred tax gross up |  |  |  |  |  | 4,600
Other than temporary impairment |  | 92,000 | $ 0 | $ 92,000 | $ 0 |
Other than temporary impairment, net of tax |  | $ 72,700 |  |  |  |
PennEast | NJR Pipeline |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage |  | 20.00% |  | 20.00% |  |
Steckman Ridge |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments in equity investees |  | $ 111,537 |  | $ 111,537 |  | 112,378
Total outstanding principal balance of loans |  | $ 70,400 |  | $ 70,400 |  | 70,400
Ownership percentage |  | 50.00% |  | 50.00% |  |
PennEast |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investments in equity investees |  | $ 5,479 |  | $ 5,479 |  | $ 95,997
Ownership percentage |  | 20.00% |  | 20.00% |  |
Construction plan, project area (in miles) | mi | 68 |  |  | 120 |  |
Number of phases | phase | 2 |  |  |  |  |

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