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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024
First lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | $ 1,586,622 | $ 1,309,449
Realized & Unrealized Gains (Losses) | (8,848) | (7,503)
Purchases of Investments | 95,536 | 93,666
Repayments | (75,234) | (85,047)
PIK Interest Capitalized | 3,002 | 3,512
Divestitures | (1,789) | (8,171)
Conversion/Exchange of Security | (3,951) | 0
Fair value. ending balance | 1,595,338 | 1,305,906
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (5,913) | (7,945)
Second lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 18,066 | 33,774
Realized & Unrealized Gains (Losses) | (696) | (2,567)
Purchases of Investments | 13 | 26
Repayments | 0 | (3,210)
PIK Interest Capitalized | 0 | 70
Divestitures | 0 | 0
Conversion/Exchange of Security | 0 | 0
Fair value. ending balance | 17,383 | 28,093
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (696) | (2,565)
Subordinated debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,218 | 1,336
Realized & Unrealized Gains (Losses) | 1 | 31
Purchases of Investments | 57 | 57
Repayments | (15) | 0
PIK Interest Capitalized | 3 | 9
Divestitures | 0 | 0
Conversion/Exchange of Security | 0 | (153)
Fair value. ending balance | 1,264 | 1,280
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 1 | 23
Preferred equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 102,918 | 71,127
Realized & Unrealized Gains (Losses) | (6,959) | (45)
Purchases of Investments | 826 | 1,804
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | (29,867) | 0
Conversion/Exchange of Security | (688) | 0
Fair value. ending balance | 66,230 | 72,886
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (2,494) | (45)
Common equity & warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 76,475 | 60,875
Realized & Unrealized Gains (Losses) | 14,267 | (4,690)
Purchases of Investments | 1,145 | 3,623
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | 0
Conversion/Exchange of Security | 4,639 | 153
Fair value. ending balance | 96,526 | 59,961
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 14,267 | (3,891)
Earnout |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 0 |
Realized & Unrealized Gains (Losses) | 0 |
Purchases of Investments | 3,457 |
Repayments | 0 |
PIK Interest Capitalized | 0 |
Divestitures | 0 |
Conversion/Exchange of Security | 0 |
Fair value. ending balance | 3,457 |
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 0 |
Total Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,785,299 | 1,476,561
Realized & Unrealized Gains (Losses) | (2,235) | (14,774)
Purchases of Investments | 101,034 | 99,176
Repayments | (75,249) | (88,257)
PIK Interest Capitalized | 3,005 | 3,591
Divestitures | (31,656) | (8,171)
Conversion/Exchange of Security | 0 | 0
Fair value. ending balance | 1,780,198 | 1,468,126
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | $ 5,165 | $ (14,423)

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