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BORROWINGS - Schedule of Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Significant Unobservable Inputs (Level 3) - Fair Value, Recurring - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023
Debt Instrument [Line Items] |  |  |  |  |
Recurring Fair Value Measurements Reported in Consolidated Statements of Assets and Liabilities Using Significant Unobservable Inputs (Level 3) | $ 79,208 |  | $ 79,208 |  | $ 35,171
Long-Term Debt |  |  |  |  |
Fair Value Measurements of Borrowings Using Significant Unobservable Inputs (Level 3) Reported in Consolidated Statements of Assets and Liabilities |  |  |  |  |
Beginning balance | 46,160 | $ 0 | 35,171 | $ 0 |
Borrowings | 95,200 | 41,500 | 127,000 | 41,500 |
Repayments | (62,100) | (24,900) | (82,900) | (24,900) |
Unrealized appreciation (depreciation) | (52) | 0 | (63) | 0 |
Ending balance | $ 79,208 | $ 16,600 | $ 79,208 | $ 16,600 |

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