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DERIVATIVE INSTRUMENTS - ADDITIONAL INFORMATION (Details) certificate in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2024 USD ($) certificate | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) certificate | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) certificate
Derivative [Line Items] |  |  |  |  |
Derivative, net liability position, aggregate fair value | $ 1.4 |  | $ 1.4 |  | $ 0.1
Treasury Lock | Interest expense |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of pre-tax gain (loss) reclassified from OCI into income | $ (0.3) | $ (0.3) | $ (0.7) | $ (0.7) |
Physical commodity contracts | ES |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of SRECs (in certificates) | certificate | 1.4 |  | 1.4 |  | 1.3

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