Quarterly report [Sections 13 or 15(d)]

BORROWINGS - Fair Value (Narrative) (Details)

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BORROWINGS - Fair Value (Narrative) (Details) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Debt Instrument [Line Items]    
Investments owned, fair value $ 1,130,859 $ 979,320 [1]
Collateral Pledged    
Debt Instrument [Line Items]    
Investments owned, fair value $ 1,000,000 $ 764,700
Credit Facility | Line of Credit    
Debt Instrument [Line Items]    
Unused fee percentage 0.75% 1.00%
Credit Facility | Revolving Line of Credit | Line of Credit    
Debt Instrument [Line Items]    
Debt instrument, variable rate floor 0.35% 0.35%
Debt instrument, basis spread on variable rate 2.90% 3.25%
[1] Cumulative gross unrealized appreciation for federal income tax purposes is $183.3 million; cumulative gross unrealized depreciation for federal income tax purposes is $144.9 million. Cumulative net unrealized appreciation is $38.5 million, based on a tax cost of $940.9 million.