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FAIR VALUE MEASUREMENTS - Schedule of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
9 Months Ended
Dec. 31, 2023
Dec. 31, 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
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
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) (9,874) (14,263)
Purchases of Investments 307,934 335,069
Repayments (139,778) (96,475)
PIK Interest Capitalized 7,925 3,512
Divestitures (13,875) 0
Conversion/Exchange of Security (6,961) (13,715)
Fair value. ending balance 1,146,355 954,000
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (4,920) (10,201)
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) 989 (7,512)
Purchases of Investments 187 2,930
Repayments (2,596) (12,239)
PIK Interest Capitalized 214 314
Divestitures 0 (692)
Conversion/Exchange of Security 0 0
Fair value. ending balance 34,614 35,446
YTD Unrealized Appreciation (Depreciation) on Investments held at period end 987 (6,307)
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) (28) (328)
Purchases of Investments 0 385
Repayments (20) 0
PIK Interest Capitalized 25 65
Divestitures 0 0
Conversion/Exchange of Security 0 (587)
Fair value. ending balance 768 852
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (28) (224)
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) (5,532) (1,253)
Purchases of Investments 7,886 3,571
Repayments 0 0
PIK Interest Capitalized 0 0
Divestitures (273) 0
Conversion/Exchange of Security 3,170 14,302
Fair value. ending balance 68,644 61,283
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (5,430) 1,840
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) 622 8,670
Purchases of Investments 5,757 4,320
Repayments 0 0
PIK Interest Capitalized 0 0
Divestitures (3,858) (2,664)
Conversion/Exchange of Security 3,791 0
Fair value. ending balance 60,456 50,840
YTD Unrealized Appreciation (Depreciation) on Investments held at period end 390 9,853
Total Investments    
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) (13,823) (14,686)
Purchases of Investments 321,764 346,275
Repayments (142,394) (108,714)
PIK Interest Capitalized 8,164 3,891
Divestitures (18,006) (3,356)
Conversion/Exchange of Security 0 0
Fair value. ending balance 1,310,837 1,102,421
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (9,001) $ (5,039)
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 Security $ 3,800