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FAIR VALUE MEASUREMENTS - Summary of Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($) $ in Thousands | 9 Months Ended
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Dec. 31, 2022 | Dec. 31, 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) | (14,686) | 13,849
Purchases of Investments | 346,275 | 409,043
Repayments | (108,714) | (226,606)
PIK Interest Capitalized | 3,891 | 3,550
Divestitures | (3,356) | (11,934)
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 1,102,421 | 819,176
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (5,039) | 6,798
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) | (14,263) | (998)
Purchases of Investments | 335,069 | 378,164
Repayments | (96,475) | (219,454)
PIK Interest Capitalized | 3,512 | 1,994
Divestitures | 0 | 0
Conversion/Reclassification of Security | (13,715) | (4,683)
Fair value. ending balance | 954,000 | 679,184
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (10,201) | (2,515)
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) | (7,512) | (1,791)
Purchases of Investments | 2,930 | 18,841
Repayments | (12,239) | (7,152)
PIK Interest Capitalized | 314 | 1,079
Divestitures | (692) | (53)
Conversion/Reclassification of Security | 0 | 5,208
Fair value. ending balance | 35,446 | 53,051
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (6,307) | (2,165)
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) | (328) | 165
Purchases of Investments | 385 | 270
Repayments | 0 | 0
PIK Interest Capitalized | 65 | 477
Divestitures | 0 | 0
Conversion/Reclassification of Security | (587) | 0
Fair value. ending balance | 852 | 12,446
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (224) | 165
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) | (1,253) | 7,796
Purchases of Investments | 3,571 | 7,511
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | 0
Conversion/Reclassification of Security | 14,302 | (525)
Fair value. ending balance | 61,283 | 37,390
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 1,840 | 7,271
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) | 8,670 | 8,677
Purchases of Investments | 4,320 | 4,257
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | (2,664) | (11,881)
Conversion/Reclassification of Security | 0 | 0
Fair value. ending balance | 50,840 | 37,105
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | $ 9,853 | $ 4,042

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