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
Mar. 31, 2026
Sep. 30, 2025
Debt Instrument [Line Items]    
Investments, at fair value $ 906,844 $ 859,124 [1]
Collateral Pledged    
Debt Instrument [Line Items]    
Investments, at fair value $ 818,800 $ 754,600
Credit Facility | Line of Credit | Revolving Line of Credit    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 2.60% 2.60%
Unused fee percentage 0.60% 1.00%
[1] Cumulative gross unrealized depreciation for federal income tax purposes is $59.7 million; cumulative gross unrealized appreciation for federal income tax purposes is $34.1 million. Cumulative net unrealized depreciation is $25.5 million, based on a tax cost of $884.7 million.