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DERIVATIVE INSTRUMENTS - ADDITIONAL INFORMATION (Details) certificate in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) certificate | Mar. 31, 2021 USD ($) | Mar. 31, 2022 USD ($) certificate | Mar. 31, 2021 USD ($) | Sep. 30, 2021 USD ($) certificate
Treasury Lock | Interest expense |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Amount of pre-tax gain (loss) reclassified from OCI into income | $ (343) | $ (342) | $ (686) | $ (685) |
Foreign currency contracts |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Notional amount | $ (20) |  | $ (20) |  | $ (123)
Physical commodity contracts | Energy Services |  |  |  |  |
Derivative [Line Items] |  |  |  |  |
Number of SRECs (in certificates) | certificate | 1,500 |  | 1,500 |  | 1,400

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