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INCOME TAXES - Net Assets Resulting from Operations to Estimated RIC Taxable Income (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2025 | Mar. 31, 2024 | Mar. 31, 2023
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net increase in net assets from operations | $ 17,561 | $ 16,268 | $ 22,684 | $ 14,035 | $ 13,469 | $ 23,484 | $ 22,624 | $ 23,812 | $ 70,548 | $ 83,389 | $ 33,093
Net unrealized (appreciation) depreciation on investments |  |  |  |  |  |  |  |  | (2,423) | (13,640) | 18,589
(Expense/loss) income/gain recognized for tax on pass-through entities |  |  |  |  |  |  |  |  | (80) | (6,383) | 962
Realized loss (gain) book/tax differences |  |  |  |  |  |  |  |  | (10,876) | 18,962 | (389)
Capital loss carryover |  |  |  |  |  |  |  |  | 70,883 | 26,449 | 12,796
Net operating income - wholly-owned subsidiary |  |  |  |  |  |  |  |  | (14,568) | (5,194) | 809
Dividend income from wholly-owned subsidiary |  |  |  |  |  |  |  |  | 9,038 | 2,000 | 1,068
Non-deductible tax expense |  |  |  |  |  |  |  |  | 1,424 | 921 | 628
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (2,726) | (2,726) | (2,726)
Non-deductible compensation |  |  |  |  |  |  |  |  | 6,693 | 3,665 | 3,243
Compensation related book/tax differences |  |  |  |  |  |  |  |  | (2,741) | 1,116 | 812
Interest on non-accrual loans |  |  |  |  |  |  |  |  | 11,999 | 5,636 | 3,343
Other book/tax differences |  |  |  |  |  |  |  |  | (187) | 1,515 | 107
Estimated distributable income before deductions for distributions |  |  |  |  |  |  |  |  | 136,984 | 115,710 | 72,335
Ordinary |  |  |  |  |  |  |  |  | 123,569 | 101,517 | 70,034
Estimated annual RIC undistributed taxable income |  |  |  |  |  |  |  |  | 13,415 | $ 14,193 | $ 2,301
Capital loss carryforwards | $ 131,000 |  |  |  |  |  |  |  | $ 131,000 |  |

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