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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) shares in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Oct. 31, 2022 | Apr. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2024 | Mar. 31, 2023
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 |  |  |  | $ 8.3 | $ 42.6 | $ (2.1) | $ 24.4
Unrealized gain (loss) on investments |  |  |  | $ (4.5) | $ (3.0) | $ 1.8 | $ 0.1
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 |  |  | $ 100.0 |  |  |  |
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 | $ 14.1 |  |  |  |  |  |
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) |  |  |  | 5.10% |  | 5.10% |
Galileo Technologies |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Payments to acquire investments |  | $ 33.0 |  |  |  |  |

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