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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2022 | Apr. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
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 |  |  |  | $ 27,400 | $ 47,400 |
Proceeds from sale of long-term investments |  |  |  | 0 | 22,042 | $ 0
Gain on investment securities |  |  |  | 11,299 | $ 57,937 | $ 6,727
Unrealized loss on investments |  |  |  | $ 4,200 |  |
Convertible Debt | Galileo Technologies |  |  |  |  |  |
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%
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 on investment securities |  |  |  |  | 8,200 |
Gain (loss) on sale of investment securities |  |  |  |  | 500 |
Gain (loss) on valuation adjustment of investment |  |  |  |  | $ 7,700 |
Tamboran Resources Limited |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Payments to acquire investments | $ 14,100 |  |  |  |  |
Investment shares acquired (in shares) | 106,000,000 |  |  |  |  |
Tamboran Resources Limited | Tamboran Resources Limited |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Ownership percentage (as a percent) |  |  |  | 6.20% |  |
Galileo Technologies |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |
Payments to acquire investments |  | $ 33,000 |  |  |  |

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