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SUBSEQUENT EVENTS - Narrative (Details) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 01, 2024 USD ($) | Apr. 04, 2024 $ / shares | Apr. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) $ / shares | Mar. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) $ / shares
Subsequent Event [Line Items] |  |  |  |  |  |
Purchase of investments |  |  |  | $ 102,733 | $ 77,469 |
Investment company, line of credit commitment |  |  |  | $ 54,146 |  | $ 45,231
Common stock, par value (in USD per share) | $ / shares |  |  |  | $ 0.001 |  | $ 0.001
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Reverse stock split, conversion ratio |  | 0.5 |  |  |  |
Common stock, par value (in USD per share) | $ / shares |  | $ 0.001 |  |  |  |
Total Access Elevator, LLC | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Purchase of investments |  |  | $ 7,300 |  |  |
Investment company, line of credit commitment |  |  | 3,000 |  |  |
Investment company, delayed draw term loan commitment |  |  | 2,500 |  |  |
Home Healthcare, LLC ("Giving Home") | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Net proceeds from the sale of investments |  |  | 29,700 |  |  |
Investment company, prepayment fee |  |  | 900 |  |  |
Proceeds from equity |  |  | $ 2,500 |  |  |
Gray Matter Systems, LLC | Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Net proceeds from the sale of investments | $ 14,000 |  |  |  |  |
Proceeds from disposition of investment, prepayment fees | $ 200 |  |  |  |  |

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