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SUBSEQUENT EVENTS (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2022 | Dec. 15, 2022 | Nov. 30, 2022 | Oct. 31, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Jul. 29, 2022 | Jun. 30, 2022 | Jun. 15, 2022 | May 31, 2022 | Apr. 29, 2022 | Sep. 30, 2021 | Sep. 15, 2021 | Aug. 31, 2021 | Jul. 30, 2021 | Jun. 30, 2021 | Jun. 17, 2021 | May 28, 2021 | Apr. 30, 2021 | Oct. 31, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Dec. 31, 2022 | Sep. 30, 2022 | Sep. 30, 2021
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 102,046 | $ 47,550
Common stock dividends paid (in USD per share) |  |  |  |  | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.075 | $ 0.120 | $ 0.075 | $ 0.075 | $ 0.070 | $ 0.030 | $ 0.070 | $ 0.070 | $ 0.070 | $ 0.060 | $ 0.070 | $ 0.070 |  |  |  |  |  |  | $ 0.570 | $ 0.510
Investment, Identifier [Axis]: Dema/Mai Holdings, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 39,100 | $ 21,000 |  |  |  |
Investment, Identifier [Axis]: Ginsey Home Solutions, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,000 |  |  |  |  |  |
Investment, Identifier [Axis]: Horizon Facilities Services, Inc. | Secured First Lien Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 30,000 |  |  |  |  |
Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. | Secured First Lien Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,400 |  |  |
Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends paid (in USD per share) |  |  |  | $ 0.080 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends paid (in USD per share) | $ 0.080 | $ 0.120 | $ 0.080 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0.360 |  |
Subsequent Event | Investment, Identifier [Axis]: Nocturne Villa Rentals, Inc. | Secured First Lien Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 8,400 |  |  |  |  |  |  |

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