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LEASES - ADDITIONAL INFORMATION (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2024	Jul. 31, 2021
Lessee, Lease, Description [Line Items]
ROU asset obtained in exchange for operating lease liability	$ 5.9	$ 9.8	$ 11.4	$ 13.9
ROU asset obtained in exchange for finance lease liability	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Weighted average remaining lease term, operating lease	28 years 3 months 18 days		28 years 3 months 18 days		28 years 7 months 6 days
Operating lease, discount rate, percentage	3.90%		3.90%		3.80%
Weighted average remaining lease term, finance lease	2 years 7 months 6 days		2 years 7 months 6 days		3 years
Finance lease, discount rate, percentage	3.30%		3.30%		3.40%
Solar Property | Minimum
Lessee, Lease, Description [Line Items]
Term of contract	20 years		20 years
Renewal term	5 years		5 years
Solar Property | Maximum
Lessee, Lease, Description [Line Items]
Term of contract	50 years		50 years
Renewal term	20 years		20 years
Office Building
Lessee, Lease, Description [Line Items]
Term of contract						16 years
Office Building | Minimum
Lessee, Lease, Description [Line Items]
Term of contract	2 years		2 years
Office Building | Maximum
Lessee, Lease, Description [Line Items]
Term of contract	11 years		11 years
Meter License | Minimum
Lessee, Lease, Description [Line Items]
Term of contract	7 years		7 years
Meter License | Maximum
Lessee, Lease, Description [Line Items]
Term of contract	10 years		10 years
Equipment
Lessee, Lease, Description [Line Items]
Term of contract	10 years		10 years
Storage and Capacity
Lessee, Lease, Description [Line Items]
Term of contract	50 years		50 years

X

- Definition

Weighted average remaining lease term for finance lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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