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DERIVATIVE INSTRUMENTS - ADDITIONAL INFORMATION (Details) certificate in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2024 USD ($) certificate	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) certificate	Jun. 30, 2023 USD ($)	Sep. 30, 2023 certificate
Treasury Lock | Interest expense
Derivative [Line Items]
Amount of pre-tax gain (loss) reclassified from OCI into income | $	$ (0.3)	$ (0.3)	$ (1.0)	$ (1.0)
Physical commodity contracts | ES
Derivative [Line Items]
Number of SRECs (in certificates) | certificate	1.5		1.5		1.3

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Number of Solar Renewable Energy Certificates

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-Topic 815
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 220
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