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DISTRIBUTIONS TO COMMON STOCKHOLDERS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2022 | Jun. 30, 2022 | [1] | Sep. 30, 2021 | Jun. 30, 2021 | [1] | Sep. 30, 2022 | Sep. 30, 2021 | Mar. 31, 2022 | Dec. 31, 2021
Equity [Abstract] |  |  |  |  |  |  |  |  |  |
Investment company, cash distributions paid to common stockholders from ordinary income | 61.10% |  |  |  |  |  | 61.10% |  |  | 71.30%
Investment company, cash distributions paid to common stockholders from capital gains | 38.90% |  |  |  |  |  | 38.90% |  |  | 28.70%
Cash distributions to common stockholders |  |  |  |  |  |  | $ 18,900 | $ 16,900 |  |
Distributions to common stockholders from ordinary income | $ 4,678 | [1] | $ 3,188 | $ 5,490 | [1] | $ 6,593 |  |  | $ 13,900 |
Distributions to common stockholders from net realized gains | 2,797 | [1] | $ 8,268 | 2,482 | [1] | $ 2,372 |  |  | $ 15,700 |
Investment company, net adjustments for tax difference to capital distribution | $ 400 |  |  | $ 2,100 |  |  | $ 1,300 | $ 2,700 |  |
Investment company, deemed distribution approach, notice period |  |  |  |  |  |  |  |  | 60 days |
[1] | o Note 9 — Distributions to Common Stockholders in the accompanying Notes to Consolidated Financial Statements for additional information.

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