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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of long-term investments |  |  |  | $ 22,042 | $ 0 |  |  |
Gain (loss) on investment securities |  | $ (14,310) | $ 2,409 | 55,684 | 7,853 |  |  |
Gain (loss) resulting from the change in the fair value of investments |  | (17,000) |  | 47,800 |  |  |  |
Level 3 |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Equity securities | $ 2,865 | $ 14,052 | 2,865 | $ 14,052 | 2,865 | $ 13,990 | $ 1,000 | $ 0
Convertible Debt | Galileo Technologies |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 500.00% |  | 500.00% |  |  |  |
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 | $ 36,524 | $ 500 | $ 36,524 | $ 500 | $ 3,500 | $ 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 |  | 2,700 |  |  |  |  |  |
Gain (loss) on sale of investment securities |  |  |  | 500 |  |  |  |
Gain (loss) on valuation adjustment of investment |  |  |  | 2,200 |  |  |  |
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 |  |  |  |  |  |  |
Dividend income from investments |  | 3,200 |  |  |  |  |  |
ADNOC Drilling | ADNOC Drilling |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Ownership percentage (as a percent) | 1.00% |  |  |  |  |  |  |
Geothermal Investments |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |
Debt securities | $ 2,700 | $ 17,000 |  | $ 17,000 |  |  |  |

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