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DISPOSITIONS (Details) $ in Thousands |  |  | 9 Months Ended
--- | --- | --- | ---
Jun. 01, 2018 USD ($) MW | Feb. 28, 2018 USD ($) | Jun. 30, 2018 USD ($) | Jun. 30, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Proceeds from sale of business |  |  | $ 27,916 | $ 0
Gain on sale of business, net |  |  | 4,687 | $ 0
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 |  | $ 9,500 |  |
Gain on sale of business, net |  |  | $ 3,700 |
Clean Energy Ventures |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Wind farm total capacity | MW | 9.7 |  |  |
Natural Gas [Member] | Commodity Contract | Issued and Outstanding Shares of NRJ Retail Services |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Derivative gain |  | $ 14,600 |  |
Clean Energy Ventures | 9.7 MW Wind Farm |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Disposal group consideration | $ 18,500 |  |  |
Gain on disposal, expected | $ (965) |  |  |

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