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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Equity [Abstract] |  |
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 | $ 7.4 | $ 6.7
Tax return of capital distribution | $ 1.4 |

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