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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, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Sep. 30, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of megawatts | Megawatt | 5 |  |  |  |  |
Operating revenues |  | $ 264,075 | $ 552,335 | $ 1,631,669 | $ 2,140,493 |
Loans receivable in other noncurrent assets |  | 36,900 |  | 36,900 |  | $ 34,700
Financial Asset, Not Past Due |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable in other current assets |  | 15,000 |  | $ 15,000 |  | 14,500
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable, term |  |  |  | 2 years |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable, term |  |  |  | 10 years |  |
Energy Services |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Operating revenues |  | 9,500 | $ 10,300 | $ 39,000 | $ 42,700 |
Deferred revenue |  | $ 68,200 |  | $ 68,200 |  | $ 33,800

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