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FAIR VALUE MEASUREMENT OF FINANCIAL INSTRUMENTS - Level 3 Unobservable Inputs (Details) - Galileo Technologies - USD ($) $ in Thousands	12 Months Ended
	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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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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