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BORROWINGS - Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - Significant Unobservable Inputs (Level 3) - Fair Value, Recurring - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Debt Instrument [Line Items]    
Credit Facility $ 0 $ 67,000
Long-Term Debt    
Fair Value Measurements of Borrowings Using Significant Unobservable Inputs (Level 3) Reported in Consolidated Statements of Assets and Liabilities    
Beginning balance 67,000 35,171
Borrowings 214,100 242,300
Repayments (281,100) (210,500)
Unrealized appreciation (depreciation) 0 29
Ending balance $ 0 $ 67,000