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ACQUISITIONS AND DISPOSITIONS - NET ASSETS ACQUIRED (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Jan. 13, 2020 | Oct. 11, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |
Purchase price |  |  | $ 523,647 | $ 0 | $ 10,000
Leaf River Energy Center LLC | NJR Pipeline |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price |  | $ 367,500 |  |  |
Net working capital adjustment |  | 4,111 |  |  |
Transaction costs |  | 1,664 |  |  |
Total costs capitalized |  | 373,275 |  |  |
Identifiable assets acquired |  |  |  |  |
Property, plant and equipment |  | 365,715 |  |  |
Base gas |  | 3,445 |  |  |
Other |  | 4 |  |  |
Net working capital |  | 4,111 |  |  |
Net assets acquired |  | $ 373,275 |  |  |
Talen Generation, LLC | Talen's Membership Interests In IEC | Adelphia Gateway |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | $ 166,000 |  |  |  |
Net working capital adjustment | (449) |  |  |  |
Transaction costs | 9,456 |  |  |  |
Total costs capitalized | 175,007 |  |  |  |
Identifiable assets acquired |  |  |  |  |
Property, plant and equipment | 174,438 |  |  |  |
Other | 1,018 |  |  |  |
Net working capital | (449) |  |  |  |
Net assets acquired | $ 175,007 |  |  |  |

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