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ACQUISITIONS AND DISPOSITIONS - ADDITIONAL INFORMATION (Details) $ in Thousands, DTH in Millions |  |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jan. 13, 2020 USD ($) mi | Dec. 19, 2019 | Oct. 11, 2019 USD ($) DTH | Nov. 30, 2017 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Payments for asset acquisitions |  |  |  |  | $ 0 | $ 523,647
Talen's Membership Interests In IEC | Talen Generation, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Pipeline length owned | mi | 84 |  |  |  |  |
Consideration to be transferred | $ 166,000 |  |  |  |  |
Cash paid related to acquisition | 156,000 |  |  | $ 10,000 |  |
Contingent consideration arrangements, range of outcomes, value, high | $ 23,000 |  |  |  |  |
Natural gas transportation capacity agreement, period |  | 10 years |  |  |  |
Leaf River Energy Center LLC | NJR Pipeline |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Percentage of voting interests acquired |  |  | 100.00% |  |  |
Payments for asset acquisitions |  |  | $ 367,500 |  |  |
Natural gas capacity of acquiree | DTH |  |  | 32.2 |  |  |
Minimum | Talen's Membership Interests In IEC | Talen Generation, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
PP&E useful life |  |  |  |  | 5 years |
Minimum | Leaf River Energy Center LLC | NJR Pipeline |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
PP&E useful life |  |  |  |  | 5 years |
Maximum | Talen's Membership Interests In IEC | Talen Generation, LLC |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
PP&E useful life |  |  |  |  | 30 years |
Maximum | Leaf River Energy Center LLC | NJR Pipeline |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
PP&E useful life |  |  |  |  | 50 years |

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