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ACQUISITIONS AND DISPOSITIONS (Details) $ in Thousands |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 07, 2019 USD ($) | Nov. 30, 2017 USD ($) | Oct. 31, 2017 USD ($) mi | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Cash paid related to acquisition |  |  |  | $ 0 | $ 10,000
Gain on sale of business, net |  |  |  | $ 645 | $ 4,687
Clean Energy Ventures |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Disposal group consideration | $ 208,600 |  |  |  |
Gain on sale of business, net | $ 645 |  |  |  |
Talen Generation, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Related party, service agreement, period |  |  |  | 10 years |
Talen's Membership Interests In IEC | Talen Generation, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Consideration to be transferred |  |  | $ 166,000 |  |
Contingent consideration arrangements, range of outcomes, value, high |  |  | $ 23,000 |  |
Cash paid related to acquisition |  | $ 10,000 |  |  |
Pipeline length owned | mi |  |  | 84 |  |

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