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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) distribution | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Dec. 31, 2023 | Dec. 31, 2022
Equity [Abstract] |  |  |  |  |  |
Number of monthly distributions | distribution |  | 3 |  |  |  |
Investment company, cash distributions paid to common stockholders from ordinary income |  |  |  |  | 100.00% | 93.20%
Investment company, cash distributions paid to common stockholders from capital gains |  |  |  |  |  | 6.80%
Cash distributions to common stockholders |  | $ 43,100 | $ 35,400 |  |  |
Undistributed ordinary income |  | 6,590 | 4,978 |  |  |
Tax return of capital distribution | [1],[2] | 0 | 0 | $ 1,406 |  |
Capital loss carryforward |  | $ 47,435 | $ 54,425 |  |  |
[1] | Per share amounts have been adjusted on a retroactive basis to reflect the Reverse Stock Split effected on April 4, 2024. Refer to Note 2—Summary of Significant Accounting Policies for additional information.
[2] | Refer to Note 9 – Distributions to Common Stockholders for additional information.

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