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FAIR VALUE MEASUREMENTS - Schedule of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2024
Mar. 31, 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 (appreciation) depreciation on investments
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) (25,020) (17,150)
Purchases of Investments 520,239 415,332
Repayments (176,763) (128,932)
PIK Interest Capitalized 10,845 5,577
Divestitures (13,875) 0
Conversion/Exchange of Security (6,961) (13,715)
Fair value. ending balance 1,309,449 1,000,984
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (19,824) (13,189)
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) 342 (7,127)
Purchases of Investments 169 2,990
Repayments (2,913) (12,310)
PIK Interest Capitalized 356 314
Divestitures 0 (692)
Conversion/Exchange of Security 0 0
Fair value. ending balance 33,774 35,820
YTD Unrealized Appreciation (Depreciation) on Investments held at period end 339 (5,923)
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) (31) (398)
Purchases of Investments 562 385
Repayments (19) 0
PIK Interest Capitalized 33 74
Divestitures 0 0
Conversion/Exchange of Security 0 (587)
Fair value. ending balance 1,336 791
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (31) (294)
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) (5,442) (3,360)
Purchases of Investments 10,279 7,788
Repayments 0 0
PIK Interest Capitalized 0 0
Divestitures (273) 0
Conversion/Exchange of Security 3,170 14,302
Fair value. ending balance 71,127 63,393
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (5,340) (267)
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) 517 10,547
Purchases of Investments 6,281 5,747
Repayments 0 0
PIK Interest Capitalized 0 0
Divestitures (3,858) (2,664)
Conversion/Exchange of Security 3,791 0
Fair value. ending balance 60,875 54,144
YTD Unrealized Appreciation (Depreciation) on Investments held at period end 285 11,730
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) (29,634) (17,488)
Purchases of Investments 537,530 432,242
Repayments (179,695) (141,242)
PIK Interest Capitalized 11,234 5,965
Divestitures (18,006) (3,356)
Conversion/Exchange of Security 0 0
Fair value. ending balance 1,476,561 1,155,132
YTD Unrealized Appreciation (Depreciation) on Investments held at period end (24,571) $ (7,943)
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