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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 | 9 Months Ended |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2023 | Dec. 31, 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) | $ 82,600 |  | $ 82,600 |  | $ 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 | 79,208 | $ 16,600 | 35,171 | $ 0 |
Borrowings | 104,900 | 41,400 | 231,900 | 82,900 |
Repayments | (101,600) | (28,400) | (184,500) | (53,300) |
Unrealized appreciation (depreciation) | 92 | 0 | 29 | 0 |
Ending balance | $ 82,600 | $ 29,600 | $ 82,600 | $ 29,600 |

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