Annual report [Section 13 and 15(d), not S-K Item 405]

BORROWINGS - Fair Value Narrative (Details)

v3.25.3
BORROWINGS - Fair Value Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Debt Instrument [Line Items]    
Fair Value $ 859,124 [1] $ 796,260 [2]
Collateral Pledged    
Debt Instrument [Line Items]    
Fair Value $ 754,600 $ 714,400
Credit Facility | Line of Credit | Revolving Line of Credit    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 2.60% 3.10%
Unused fee percentage 1.00% 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.
[2] Cumulative gross unrealized depreciation for federal income tax purposes is $66.1 million; cumulative gross unrealized appreciation for federal income tax purposes is $85.8 million. Cumulative net unrealized appreciation is $19.7 million, based on a tax cost of $776.5 million