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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Thousands, shares in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 31, 2022 | Apr. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022 | Sep. 30, 2022 | Dec. 31, 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 |  |  |  | $ 42,600 | $ 16,700 | $ 24,400 | $ 64,500 |  |  |
Unrealized gain (loss) on investments |  |  |  | (3,000) |  | 100 |  |  |  |
Revenue included in contract backlog |  |  |  |  |  | 30,300 |  |  |  |
Geothermal Investments |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Other debt securities |  |  |  | 27,300 |  | 27,300 |  |  | $ 23,700 |
Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Equity securities |  |  | $ 2,865 | 26,301 | 13,990 | 26,301 | 13,990 | $ 25,800 | 23,745 | $ 8,881
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) |  |  | 159.7 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
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) | 106.0 |  |  |  |  |  |  |  |  |
Tamboran Resources Limited | Tamboran Resources Limited |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage (as a percent) | 7.50% |  |  |  |  |  |  |  |  |
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 | $ 35,140 | $ 3,500 | $ 35,140 | $ 3,500 | $ 33,107 | $ 33,565 | $ 3,500

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