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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2023 USD ($) distribution | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2022 | Dec. 31, 2021
Equity [Abstract] |  |  |  |  |  |
Number of monthly distributions | distribution |  | 3 |  |  |  |
Investment company, cash distributions paid to common stockholders from ordinary income |  |  |  |  | 93.20% | 100.00%
Investment company, cash distributions paid to common stockholders from capital gains |  |  |  |  | 6.80% |
Cash distributions to common stockholders |  | $ 35,400 | $ 27,300 |  |  |
Undistributed ordinary income |  | 4,978 | 0 |  |  |
Tax return of capital distribution | [1] | 0 | 1,406 | $ 985 |  |
Capital loss carryforward |  | $ 54,425 | $ 62,910 |  |  |
[1] | Refer to Note 9 – Distributions to Common Stockholders in the accompanying Notes to Consolidated Financial Statements for additional information.

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