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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) $ in Millions | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) distribution | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 | Dec. 31, 2022
Equity [Abstract] |  |  |  |  |
Investment company, 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 | $ 21.5 | $ 15.7 |  |  |
Tax return of capital distribution |  |  | $ 5.0 |  |

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