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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 |  |  |

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