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FAIR VALUE MEASUREMENTS - Schedule of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
6 Months Ended
Sep. 30, 2023
Sep. 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) (7,614) (5,406)
Purchases of Investments 208,631 218,634
Repayments (41,441) (85,740)
PIK Interest Capitalized 2,713 1,976
Divestitures (17,277) (2,441)
Conversion/Exchange of Security 0 0
Fair value. ending balance 1,300,144 1,006,034
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (8,149) (6,098)
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) (5,395) (8,608)
Purchases of Investments 200,986 211,433
Repayments (40,307) (85,598)
PIK Interest Capitalized 2,678 1,694
Divestitures (13,875) 0
Conversion/Exchange of Security (3,791) (6,238)
Fair value. ending balance 1,141,280 852,555
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (5,740) (10,824)
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) 2,184 (4,461)
Purchases of Investments 126 2,862
Repayments (1,114) (142)
PIK Interest Capitalized 18 225
Divestitures 0 (692)
Conversion/Exchange of Security 0 0
Fair value. ending balance 37,034 50,437
YTD Unrealized Appreciation (Depreciation) on Investments held at period end 2,181 (2,945)
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) (915)
Purchases of Investments 0 0
Repayments (20) 0
PIK Interest Capitalized 17 57
Divestitures 0 0
Conversion/Exchange of Security 0 0
Fair value. ending balance 760 459
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (28) (914)
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) (1,345) (990)
Purchases of Investments 4,392 2,859
Repayments 0 0
PIK Interest Capitalized 0 0
Divestitures 0 0
Conversion/Exchange of Security 0 6,238
Fair value. ending balance 66,440 52,770
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (1,345) (991)
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) (3,030) 9,568
Purchases of Investments 3,127 1,480
Repayments 0 0
PIK Interest Capitalized 0 0
Divestitures (3,402) (1,749)
Conversion/Exchange of Security 3,791 0
Fair value. ending balance 54,630 49,813
YTD Unrealized Appreciation (Depreciation) on Investments held at period end $ (3,217) $ 9,576