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DERIVATIVE INSTRUMENTS - ADDITIONAL INFORMATION (Details) $ in Thousands, certificate in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) certificate | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) certificate | Jun. 30, 2022 USD ($) | Sep. 30, 2022 USD ($) certificate
Derivative [Line Items] |  |  |  |  |
Derivative, net liability position, aggregate fair value | $ 0 |  | $ 0 |  | $ 161
Treasury Lock | Interest expense |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of pre-tax gain (loss) reclassified from OCI into income | $ (342) | $ (341) | $ (1,000) | $ (1,000) |
Physical commodity contracts | Energy Services |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of SRECs (in certificates) | certificate | 1.5 |  | 1.5 |  | 1.2

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