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FAIR VALUE MEASUREMENTS - Schedule of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($) $ in Thousands | 3 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Gain (Loss), Investment and Derivative, Operating, after Tax
Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss), Statement of Income or Comprehensive Income Extensible List Not Disclosed Flag |  | Net unrealized depreciation (appreciation) on investments
First lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | $ 1,309,449 | $ 1,000,984
Realized & Unrealized Gains (Losses) | (7,503) | 558
Purchases of Investments | 93,666 | 100,244
Repayments | (85,047) | (24,785)
PIK Interest Capitalized | 3,512 | 1,990
Divestitures | (8,171) | 0
Conversion/Exchange of Security3 | 0 | (3,791)
Fair value. ending balance | 1,305,906 | 1,075,200
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (7,945) | 446
Second lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 33,774 | 35,820
Realized & Unrealized Gains (Losses) | (2,567) | (876)
Purchases of Investments | 26 | 62
Repayments | (3,210) | (71)
PIK Interest Capitalized | 70 | 0
Divestitures | 0 | 0
Conversion/Exchange of Security3 | 0 | 0
Fair value. ending balance | 28,093 | 34,935
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (2,565) | (876)
Subordinated debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,336 | 791
Realized & Unrealized Gains (Losses) | 31 | 0
Purchases of Investments | 57 | 0
Repayments | 0 | (20)
PIK Interest Capitalized | 9 | 9
Divestitures | 0 | 0
Conversion/Exchange of Security3 | (153) | 0
Fair value. ending balance | 1,280 | 780
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 23 | 0
Preferred equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 71,127 | 63,393
Realized & Unrealized Gains (Losses) | (45) | 2,422
Purchases of Investments | 1,804 | 1,844
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | 0
Conversion/Exchange of Security3 | 0 | 0
Fair value. ending balance | 72,886 | 67,659
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (45) | 2,422
Common equity & warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 60,875 | 54,144
Realized & Unrealized Gains (Losses) | (4,690) | (2,779)
Purchases of Investments | 3,623 | 3,128
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | (3,402)
Conversion/Exchange of Security3 | 153 | 3,791
Fair value. ending balance | 59,961 | 54,882
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (3,891) | (2,965)
Total Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,476,561 | 1,155,132
Realized & Unrealized Gains (Losses) | (14,774) | (675)
Purchases of Investments | 99,176 | 105,278
Repayments | (88,257) | (24,876)
PIK Interest Capitalized | 3,591 | 1,999
Divestitures | (8,171) | (3,402)
Conversion/Exchange of Security3 | 0 | 0
Fair value. ending balance | 1,468,126 | 1,233,456
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (14,423) | $ (973)
Cost basis allocated from first lien debt to warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Conversion/Exchange of Security3 | $ 3,800 |

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