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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
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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

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