RELATED PARTY TRANSACTIONS - Schedule of Related Party Fees Due (Details) - Related Party - USD ($) $ in Thousands		Jun. 30, 2023	Sep. 30, 2022
Related Party Transaction [Line Items]
Fees due to related party		$ 3,209	$ 2,527
Adviser
Related Party Transaction [Line Items]
Fees due to related party	[1]	2,513	2,104
Administrator
Related Party Transaction [Line Items]
Fees due to related party	[1]	696	423
Base management fee due to Adviser
Related Party Transaction [Line Items]
Base management fee due to Adviser		(890)	(189)
Loan servicing fee due to Adviser
Related Party Transaction [Line Items]
Fees due to related party		484	423
Incentive fee due to Adviser
Related Party Transaction [Line Items]
Fees due to related party		$ 2,919	$ 1,870

[1] Refer to Note 4—Related Party Transactions in the accompanying Notes to Consolidated Financial Statements for additional information.