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INCOME TAXES - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Income Tax Contingency [Line Items] |  |  |  |  |  |
Dividends | $ 24,800 | $ 22,900 | $ 20,900 |  |  |
Dividends declared (in usd per share) | $ 0.62 | $ 0.59 | $ 0.58 |  |  |
Cost of investments | $ 1,349,600 |  | $ 1,210,800 |  | $ 1,349,600 |
Gross unrealized appreciation | 79,300 |  | 72,300 |  | 79,300 |
Gross unrealized depreciation | (75,300) |  | (76,800) |  | (75,300) |
Net unrealized appreciation (depreciation) | 4,000 |  | (4,500) |  | 4,000 |
Deferred tax liability | 10,358 |  | $ 12,117 |  | 10,358 |
Income tax provision (benefit) | (783) |  |  | $ 534 | (336) | $ 726
Excise tax | 100 |  |  | 200 | 300 | 300
RIC |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Cost of investments | 1,304,500 |  |  |  | 1,304,500 |
Gross unrealized appreciation | 17,300 |  |  |  | 17,300 |
Gross unrealized depreciation | (71,000) |  |  |  | (71,000) |
Net unrealized appreciation (depreciation) | (53,700) |  |  |  | (53,700) |
Taxable Subsidiary |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Cost of investments | 45,100 |  |  |  | 45,100 |
Gross unrealized appreciation | 62,000 |  |  |  | 62,000 |
Gross unrealized depreciation | (4,300) |  |  |  | (4,300) |
Net unrealized appreciation (depreciation) | 57,700 |  |  |  | 57,700 |
Income tax provision (benefit) | $ (900) |  |  | $ 300 | $ (600) | $ 400
Regular Dividends |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.56 | 0.54 | $ 0.53 |  |  |
Supplemental Dividends |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Dividends declared (in usd per share) | $ 0.06 | $ 0.05 | $ 0.05 |  |  |

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