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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Gain (loss) resulting from the change in the fair value of investments |  | $ 47,400 |  |
Proceeds from sale of long-term investments |  | 22,042 | $ 0 | $ 0
Gain (loss) on investment securities |  | 57,937 | 6,727 | (8,720)
Geothermal Investments |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Other debt securities | $ 2,700 | 23,700 | 2,700 |
Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | 2,865 | $ 23,745 | $ 2,865 | 0
Galileo Technologies | Convertible Debt |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Interest rate (as a percent) |  | 5.00% |  |
ADNOC Drilling |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Payments to acquire investments | $ 100,000 |  |  |
Investment balance (in shares) | 159,700,000 |  | 159,700,000 |
Investments lockup period (in years) | 3 years |  |  |
ADNOC Drilling | ADNOC Drilling |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Ownership percentage (as a percent) | 1.00% |  | 1.00% |
Galileo Technologies |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Payments to acquire investments |  | $ 33,000 |  |
Galileo Technologies | Level 3 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Equity securities | $ 500 | $ 33,565 | $ 500 | $ 500
Schlumberger, Ltd |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Sale of equity securities, number of shares sold (in shares) |  | 467,500 |  |
Proceeds from sale of long-term investments |  | $ 22,000 |  |
Gain (loss) on investment securities |  | 8,200 |  |
Gain (loss) on sale of investment securities |  | 500 |  |
Gain (loss) on valuation adjustment of investment |  | $ 7,700 |  |

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