COMMITMENTS AND CONTINGENCIES - Schedule of Principal Balances of Unused Line of Credit and Delayed Draw Term Debt Commitments and Guaranties (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023	Sep. 30, 2023
Other Commitments [Line Items]
Total	$ 54,710	$ 45,231
Unused line of credit commitments
Other Commitments [Line Items]
Total	32,592	32,349
Delayed draw term loans
Other Commitments [Line Items]
Total	21,275	12,039
Uncalled capital commitment
Other Commitments [Line Items]
Total	$ 843	$ 843