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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2021 Megawatt | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Sep. 30, 2024 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Operating revenues |  | $ 298,946 | $ 275,636 | $ 1,700,334 | $ 1,400,759 |
Loans receivable in other noncurrent assets |  | 67,500 |  | 67,500 |  | $ 53,600
BPU |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of megawatts | Megawatt | 5 |  |  |  |  |
Financial Asset, Not Past Due |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable in other current assets |  | 21,000 |  | $ 21,000 |  | 18,100
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable, term |  |  |  | 3 years |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable, term |  |  |  | 10 years |  |
ES |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Operating revenues |  | 4,900 | $ 9,500 | $ 14,800 | $ 28,500 |
Deferred revenue |  | $ 41,800 |  | $ 41,800 |  | $ 22,300

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