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RELATED PARTY TRANSACTIONS - Schedule of Related Party Transactions (Details) - USD ($) | 12 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021
Related Party Transactions [Abstract] |  |  |  |
Average total assets subject to base management fee |  | $ 685,600,000 | $ 585,543,000 | $ 495,657,000
Multiplied by annual base management fee of 1.75% |  | 1.75% | 1.75% | 1.75%
Base management fee | [1] | $ 11,998,000 | $ 10,247,000 | $ 8,674,000
Portfolio company fee credit |  | (3,263,000) | (4,196,000) | (2,195,000)
Syndicated loan fee credit |  | (126,000) | (170,000) | (307,000)
Net Base Management Fee |  | 8,609,000 | 5,881,000 | 6,172,000
Loan servicing fee | [1] | 8,053,000 | 6,329,000 | 5,579,000
Credits to base management fee – loan servicing fee |  | (8,053,000) | (6,329,000) | (5,579,000)
Net Loan Servicing Fee |  | 0 | 0 | 0
Incentive fee | [1] | 10,255,000 | 7,511,000 | 5,746,000
Incentive fee credit |  | 0 | (437,000) | (451,000)
Net Incentive Fee |  | 10,255,000 | 7,074,000 | 5,295,000
Credits to fees from Adviser - other |  | $ (3,389,000) | $ (4,803,000) | $ (2,953,000)
Base management fee |  | 1.75% |  |
[1] | Refer to Note 4—Related Party Transactions for additional information.

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