Annual report pursuant to Section 13 and 15(d)

BORROWINGS - Fair Value Narrative (Details)

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BORROWINGS - Fair Value Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Fair Value $ 796,260 [1] $ 704,815 [2]
Collateral Pledged    
Debt Instrument [Line Items]    
Fair Value $ 714,400 $ 628,300
Credit Facility | Line of Credit | Revolving Line of Credit    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 3.10% 3.10%
Unused fee percentage 1.00% 1.00%
[1] 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.
[2] Cumulative gross unrealized depreciation for federal income tax purposes is $56.9 million; cumulative gross unrealized appreciation for federal income tax purposes is $33.7 million. Cumulative net unrealized depreciation is $23.2 million, based on a tax cost of $728.0 million.