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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ADDITIONAL INFORMATION (Details) $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2021 Megawatt | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Number of megawatts | Megawatt | 5 |  |  |  |  |
Operating revenues |  | $ 657,913 | $ 644,027 | $ 1,125,123 | $ 1,367,594 |
Loans receivable in other noncurrent assets |  | 43,600 |  | 43,600 |  | $ 39,000
Financial Asset, Not Past Due |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable in other current assets |  | 15,800 |  | $ 15,800 |  | 15,100
Minimum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable, term |  |  |  | 2 years |  |
Maximum |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Loans receivable, term |  |  |  | 10 years |  |
ES |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Operating revenues |  | 9,500 | $ 9,500 | $ 19,000 | $ 29,500 |
Deferred revenue |  | $ 107,200 |  | $ 107,200 |  | $ 58,700

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