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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Oct. 31, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Mar. 31, 2024
Dividends Payable [Line Items] |  |  |  |  |  |
Investment company, cash distributions paid to common stockholders from ordinary income |  | 51.00% |  | 51.00% |  |
Investment company, cash distributions paid to common stockholders from capital gains |  | 49.00% |  | 49.00% |  |
Cash distributions to common stockholders |  |  |  | $ 43.3 |  |
Payments of dividends |  |  |  | 17.6 | $ 24.3 |
Investment company, distributions paid subsequent to fiscal year-end, classified in prior year, ordinary income |  |  |  |  |  | $ 18.7
Investment company, distribution paid subsequent to fiscal year-end, classified in prior year, capital gains |  |  |  |  |  | $ 1.4
Investment company, net adjustments for tax difference to capital distribution |  | $ 0.6 | $ 0.5 | $ 0.8 | $ 0.1 |
Subsequent Event |  |  |  |  |  |
Dividends Payable [Line Items] |  |  |  |  |  |
Payments of dividends | $ 25.7 |  |  |  |  |

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