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FAIR VALUE MEASUREMENTS - Summary 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, 2023 | Jun. 30, 2022
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 | 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 | YTD Unrealized Appreciation (Depreciation) on Investments held at period end | YTD Unrealized Appreciation (Depreciation) on Investments held at period end
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | $ 1,155,132 | $ 879,011
Realized & Unrealized Gains (Losses) | (675) | (2,929)
Purchases of Investments | 105,278 | 135,804
Repayments | (24,876) | (56,008)
PIK Interest Capitalized | 1,999 | 810
Divestitures | (3,402) | (1,749)
Conversion/Exchange of Security2 | 0 | 0
Fair value. ending balance | 1,233,456 | 954,939
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (973) | (1,987)
First lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,000,984 | 739,872
Realized & Unrealized Gains (Losses) | 558 | (1,546)
Purchases of Investments | 100,244 | 132,425
Repayments | (24,785) | (55,937)
PIK Interest Capitalized | 1,990 | 623
Divestitures | 0 | 0
Conversion/Exchange of Security2 | (3,791) | 0
Fair value. ending balance | 1,075,200 | 815,437
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 446 | (613)
Second lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 35,820 | 52,645
Realized & Unrealized Gains (Losses) | (876) | (4,145)
Purchases of Investments | 62 | 62
Repayments | (71) | (71)
PIK Interest Capitalized | 0 | 139
Divestitures | 0 | 0
Conversion/Exchange of Security2 | 0 | 0
Fair value. ending balance | 34,935 | 48,630
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (876) | (4,145)
Subordinated debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 791 | 1,317
Realized & Unrealized Gains (Losses) | 0 | 0
Purchases of Investments | 0 | 0
Repayments | (20) | 0
PIK Interest Capitalized | 9 | 48
Divestitures | 0 | 0
Conversion/Exchange of Security2 | 0 | 0
Fair value. ending balance | 780 | 1,365
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 0 | 0
Preferred equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 63,393 | 44,663
Realized & Unrealized Gains (Losses) | 2,422 | (778)
Purchases of Investments | 1,844 | 2,109
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | 0
Conversion/Exchange of Security2 | 0 | 0
Fair value. ending balance | 67,659 | 45,994
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 2,422 | (778)
Common equity & warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 54,144 | 40,514
Realized & Unrealized Gains (Losses) | (2,779) | 3,540
Purchases of Investments | 3,128 | 1,208
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | (3,402) | (1,749)
Conversion/Exchange of Security2 | 3,791 | 0
Fair value. ending balance | 54,882 | 43,513
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | $ (2,965) | $ 3,549

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