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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Dividends | $ 19,300 | $ 14,300 | $ 16,600 | $ 11,800 |  |  |
Dividends cash paid (in usd per share) |  |  | $ 0.63 | $ 0.48 |  |  |
Dividends declared (in usd per share) | $ 0.57 | $ 0.50 |  |  |  |  |
Cost of investments | $ 1,150,600 |  |  | $ 852,400 |  | $ 1,150,600 |
Gross unrealized appreciation | 66,900 |  |  | 67,800 |  | 66,900 |
Gross unrealized depreciation | (66,700) |  |  | (61,700) |  | (66,700) |
Net unrealized appreciation (depreciation) | 200 |  |  | 6,100 |  | 200 |
Deferred tax liability | 11,427 |  |  | $ 5,747 |  | 11,427 |
Income tax provision | (746) |  |  |  | $ (62) | (20) | $ 648
Excise tax | 200 |  |  |  | 100 | 468 | 191
RIC |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Cost of investments | 1,116,800 |  |  |  |  | 1,116,800 |
Gross unrealized appreciation | 9,700 |  |  |  |  | 9,700 |
Gross unrealized depreciation | (64,300) |  |  |  |  | (64,300) |
Net unrealized appreciation (depreciation) | (54,600) |  |  |  |  | (54,600) |
Taxable Subsidiary |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Cost of investments | 33,800 |  |  |  |  | 33,800 |
Gross unrealized appreciation | 57,200 |  |  |  |  | 57,200 |
Gross unrealized depreciation | (2,400) |  |  |  |  | (2,400) |
Net unrealized appreciation (depreciation) | 54,800 |  |  |  |  | 54,800 |
Income tax provision | $ (900) |  |  |  | $ 200 | $ (488) | $ 457
Regular Dividends |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Dividends cash paid (in usd per share) |  |  | 0.48 |  |  |  |
Dividends declared (in usd per share) | $ 0.52 |  |  |  |  |  |
Special Dividend |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Dividends cash paid (in usd per share) |  |  | $ 0.15 |  |  |  |
Supplemental dividend |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.05 |  |  |  |  |  |

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