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FAIR VALUE MEASUREMENTS - Changes in Fair Value of Investments Measured Using Level 3 Inputs (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023
First lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | $ 1,309,449 | $ 1,000,984
Realized & Unrealized Gains (Losses) | (14,912) | (5,395)
Purchases of Investments | 196,254 | 200,986
Repayments | (128,801) | (40,307)
PIK Interest Capitalized | 5,984 | 2,678
Divestitures | (22,585) | (13,875)
Conversion/Exchange of Security3 | 0 | (3,791)
Fair value. ending balance | 1,345,389 | 1,141,280
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (15,970) | (5,740)
Second lien loans |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 33,774 | 35,820
Realized & Unrealized Gains (Losses) | (1,986) | 2,184
Purchases of Investments | (4) | 126
Repayments | (3,420) | (1,114)
PIK Interest Capitalized | 70 | 18
Divestitures | 0 | 0
Conversion/Exchange of Security3 | (1,062) | 0
Fair value. ending balance | 27,372 | 37,034
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (106) | 2,181
Subordinated debt |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,336 | 791
Realized & Unrealized Gains (Losses) | 29 | (28)
Purchases of Investments | 57 | 0
Repayments | 0 | (20)
PIK Interest Capitalized | 11 | 17
Divestitures | 0 | 0
Conversion/Exchange of Security3 | (153) | 0
Fair value. ending balance | 1,280 | 760
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | 21 | (28)
Preferred equity |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 71,127 | 63,393
Realized & Unrealized Gains (Losses) | (132) | (1,345)
Purchases of Investments | 3,557 | 4,392
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | 0
Conversion/Exchange of Security3 | 0 | 0
Fair value. ending balance | 74,552 | 66,440
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (132) | (1,345)
Common equity & warrants |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 60,875 | 54,144
Realized & Unrealized Gains (Losses) | (5,861) | (3,030)
Purchases of Investments | 3,685 | 3,127
Repayments | 0 | 0
PIK Interest Capitalized | 0 | 0
Divestitures | 0 | (3,402)
Conversion/Exchange of Security3 | 1,215 | 3,791
Fair value. ending balance | 59,914 | 54,630
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (5,062) | (3,217)
Total Investments |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |
Fair value, beginning balance | 1,476,561 | 1,155,132
Realized & Unrealized Gains (Losses) | (22,862) | (7,614)
Purchases of Investments | 203,549 | 208,631
Repayments | (132,221) | (41,441)
PIK Interest Capitalized | 6,065 | 2,713
Divestitures | (22,585) | (17,277)
Conversion/Exchange of Security3 | 0 | 0
Fair value. ending balance | 1,508,507 | 1,300,144
YTD Unrealized Appreciation (Depreciation) on Investments held at period end | (21,249) | $ (8,149)
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 Security3 | $ 3,800 |

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