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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, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net increase in net assets from operations | $ 13,469 | $ 23,484 | $ 22,624 | $ 23,812 | $ 18,176 | $ 2,949 | $ 9,458 | $ 2,510 | $ 83,389 | $ 33,093 | $ 42,815
Net unrealized (appreciation) depreciation on investments |  |  |  |  |  |  |  |  | (13,640) | 18,589 | (11,467)
(Expense/loss) income/gain recognized for tax on pass-through entities |  |  |  |  |  |  |  |  | (6,383) | 962 | 3,753
Loss (gain) recognized on dispositions |  |  |  |  |  |  |  |  | 16,074 | (1,473) | 152
Capital loss carryover |  |  |  |  |  |  |  |  | 26,449 | 12,796 | (878)
Net operating (income) loss - wholly-owned subsidiary |  |  |  |  |  |  |  |  | (5,194) | 809 | (10,757)
Dividend income from wholly-owned subsidiary |  |  |  |  |  |  |  |  | 2,000 | 1,068 | 4,000
Non-deductible tax expense |  |  |  |  |  |  |  |  | 921 | 628 | 65
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | (2,726) | (2,726) | 12,268
Non-deductible compensation |  |  |  |  |  |  |  |  | 3,665 | 3,243 | 3,679
Compensation related book/tax differences |  |  |  |  |  |  |  |  | 1,116 | 812 | 36
Interest on non-accrual loans |  |  |  |  |  |  |  |  | 5,636 | 3,343 | 4,171
Other book/tax differences |  |  |  |  |  |  |  |  | 4,403 | 1,191 | 1,530
Estimated distributable income before deductions for distributions |  |  |  |  |  |  |  |  | 115,710 | 72,335 | 49,367
Ordinary |  |  |  |  |  |  |  |  | 101,517 | 70,034 | 57,518
Estimated annual RIC undistributed taxable income |  |  |  |  |  |  |  |  | 14,193 | $ 2,301 | $ (8,151)
Capital loss carryover | $ 60,100 |  |  |  |  |  |  |  | $ 60,100 |  |

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