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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
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