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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Level 3 Unobservable Inputs (Details) - Galileo Technologies - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2023 | Sep. 30, 2022
Recurring Fair Value Measurements |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value (in thousands) | $ 35,434 | $ 33,000
Level 3 |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Discount rate | 19.20% | 22.40%
Risk-free rate | 4.30% | 4.00%
Equity volatility | 92.00% | 92.50%
Level 3 | Recurring Fair Value Measurements |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value (in thousands) | $ 35,434 | $ 33,000

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