COMMITMENTS AND CONTINGENCIES - Schedule of Principal Balances of Unused Line of Credit and Delayed Draw Term Debt Commitments and Guaranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Other Commitments [Line Items]
Line of credit commitment	$ 45,231	$ 74,846
Unused line of credit commitments
Other Commitments [Line Items]
Line of credit commitment	32,349	36,225
Delayed draw term loans
Other Commitments [Line Items]
Line of credit commitment	12,039	37,778
Uncalled capital commitment
Other Commitments [Line Items]
Line of credit commitment	$ 843	$ 843