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ACQUISITIONS AND DISPOSITIONS - DISPOSITIONS (Details) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 07, 2019 USD ($) | Jun. 01, 2018 USD ($) MW | Feb. 28, 2018 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Gain on sale of businesses, net |  |  |  | $ 0 | $ 645 | $ 4,663
Proceeds from sale of businesses, net of closing costs |  |  |  | $ 0 | $ 205,745 | $ 27,916
Clean Energy Ventures |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Wind farm total capacity (in MW) | MW |  | 9.7 |  |  |  |
Disposal group consideration | $ 208,600 | $ 18,500 |  |  |  |
Proceeds from sale of business |  | $ 951 |  |  |  |
Gain on sale of businesses, net | $ 645 |  |  |  |  |
Clean Energy Ventures | Natural Gas |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Derivative gain |  |  | $ 14,600 |  |  |
Issued And Outstanding Shares Of NRJ Retail Services |  |  |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |  |  |
Proceeds from sale of business |  |  | 3,700 |  |  |
Proceeds from sale of businesses, net of closing costs |  |  | $ 9,500 |  |  |

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