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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 | Apr. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Mar. 31, 2023 | Sep. 30, 2022 | Mar. 31, 2022
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 |  |  |  | $ (17,000) | $ (17,000) | $ 7,400 | $ 47,800 |  |  |
Proceeds from sale of long-term investments |  |  |  |  |  | 0 | 22,042 |  |  |
Gain (loss) on investment securities |  |  |  | (18,538) | (14,310) | 6,123 | $ 55,684 |  |  |
Unrealized gain (loss) on investments |  |  |  | 1,600 |  | 1,500 |  |  |  |
Geothermal Investments |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Other debt securities |  |  |  | 27,400 |  | 27,400 |  |  | $ 23,700 |
Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Equity securities |  |  |  | 26,300 |  | 26,300 |  |  | 23,700 |
Investments |  |  |  | 10,700 |  | 10,700 |  |  | 10,700 |
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 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
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 |  |  |  |  | 2,700 |  | 8,200 |  |  |
Gain (loss) on sale of investment securities |  |  |  |  | 500 |  | 500 |  |  |
Gain (loss) on valuation adjustment of investment |  |  |  |  | 2,200 |  | 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 |  |  |  |  |  |  |  |
Galileo Technologies | Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | $ 500 | $ 37,182 | $ 36,524 | $ 37,182 | $ 36,524 | $ 35,140 | $ 33,565 | $ 3,500

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