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ACQUISITIONS AND DISPOSITIONS - ACQUISITIONS (Details) $ in Thousands, DTH in Millions |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 13, 2020 USD ($) mi | Oct. 11, 2019 USD ($) DTH | Nov. 30, 2017 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Purchase price |  |  |  | $ 523,647 | $ 0 | $ 10,000
Leaf River Energy Center LLC | NJR Pipeline |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  | 100.00% |  |  |  |
Purchase price |  | $ 367,500 |  |  |  |
Natural gas capacity of acquiree | DTH |  | 32.2 |  |  |  |
Leaf River Energy Center LLC | Minimum | NJR Pipeline |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 5 years |  |
Leaf River Energy Center LLC | Maximum | NJR Pipeline |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 50 years |  |
Talen Generation, LLC | Talen's Membership Interests In IEC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Pipeline length owned | mi | 84 |  |  |  |  |
Base purchase price | $ 166,000 |  |  |  |  |
Initial payment | 156,000 |  | $ 10,000 |  |  |
Additional contingent consideration | $ 23,000 |  |  |  |  |
Natural Gas Transportation Capacity Agreement, Period | 10 years |  |  |  |  |
Talen Generation, LLC | Talen's Membership Interests In IEC | Minimum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 5 years |  |
Talen Generation, LLC | Talen's Membership Interests In IEC | Maximum |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Estimated Useful Lives |  |  |  | 30 years |  |

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