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FAIR VALUE MEASUREMENTS - Summary 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, 2022 | Sep. 30, 2021
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) | (5,406) | 10,722
Purchases of Investments | 218,634 | 187,748
Repayments | (85,740) | (68,424)
PIK Interest Capitalized | 1,976 | 2,684
Divestitures | (2,441) | (5,424)
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 1,006,034 | 758,580
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (6,098) | 8,168
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) | (8,608) | (592)
Purchases of Investments | 211,433 | 167,042
Repayments | (85,598) | (66,868)
PIK Interest Capitalized | 1,694 | 1,589
Divestitures | 0 | 0
Conversion/Reclassification of Security | (6,238) | 0
Fair value. ending balance | 852,555 | 625,332
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (10,824) | (2,203)
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) | (4,461) | 254
Purchases of Investments | 2,862 | 15,543
Repayments | (142) | (1,556)
PIK Interest Capitalized | 225 | 654
Divestitures | (692) | (53)
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 50,437 | 51,761
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (2,945) | 290
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) | (915) | 184
Purchases of Investments | 0 | 169
Repayments | 0 | 0
PIK Interest Capitalized | 57 | 441
Divestitures | 0 | 0
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 459 | 12,328
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (914) | 183
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) | (990) | 609
Purchases of Investments | 2,859 | 4,211
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | 0
Conversion/Reclassification of Security | 6,238 | 0
Fair value. ending balance | 52,770 | 27,428
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (991) | 610
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) | 9,568 | 10,267
Purchases of Investments | 1,480 | 783
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | (1,749) | (5,371)
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 49,813 | 41,731
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | $ 9,576 | $ 9,288

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