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FAIR VALUE MEASUREMENTS - Summary of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2023 | Mar. 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] | Realized and Unrealized Gain (Loss), Investment and Derivative, Operating, after Tax | Realized and Unrealized 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 | $ 879,011 | $ 631,274
Realized & Unrealized Gains (Losses) | (17,488) | 22,740
Purchases of Investments | 432,242 | 499,023
Repayments | (141,242) | (266,282)
PIK Interest Capitalized | 5,965 | 4,190
Divestitures | (3,356) | (11,934)
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 1,155,132 | 879,011
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (7,943) | 15,427
First lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 739,872 | 524,161
Realized & Unrealized Gains (Losses) | (17,150) | 719
Purchases of Investments | 415,332 | 464,758
Repayments | (128,932) | (247,538)
PIK Interest Capitalized | 5,577 | 2,455
Divestitures | 0 | 0
Conversion/Reclassification of Security | (13,715) | (4,683)
Fair value. ending balance | 1,000,984 | 739,872
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (13,189) | (960)
Second lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 52,645 | 36,919
Realized & Unrealized Gains (Losses) | (7,127) | (2,325)
Purchases of Investments | 2,990 | 18,902
Repayments | (12,310) | (7,223)
PIK Interest Capitalized | 314 | 1,217
Divestitures | (692) | (53)
Conversion/Reclassification of Security | 0 | 5,208
Fair value. ending balance | 35,820 | 52,645
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (5,923) | (2,699)
Subordinated debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,317 | 11,534
Realized & Unrealized Gains (Losses) | (398) | 422
Purchases of Investments | 385 | 364
Repayments | 0 | (11,521)
PIK Interest Capitalized | 74 | 518
Divestitures | 0 | 0
Conversion/Reclassification of Security | (587) | 0
Fair value. ending balance | 791 | 1,317
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (294) | 322
Preferred equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 44,663 | 22,608
Realized & Unrealized Gains (Losses) | (3,360) | 11,889
Purchases of Investments | 7,788 | 10,691
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | 0
Conversion/Reclassification of Security | 14,302 | (525)
Fair value. ending balance | 63,393 | 44,663
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (267) | 11,363
Common equity & warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 40,514 | 36,052
Realized & Unrealized Gains (Losses) | 10,547 | 12,035
Purchases of Investments | 5,747 | 4,308
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | (2,664) | (11,881)
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 54,144 | 40,514
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | $ 11,730 | $ 7,401

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