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
May 13, 2022
Sep. 30, 2023
Sep. 30, 2022
Debt Instrument [Line Items]      
Fair Value   $ 704,815 [1] $ 649,615 [2]
Collateral Pledged      
Debt Instrument [Line Items]      
Fair Value   $ 628,300 $ 577,600
Credit Facility | Line of Credit | Revolving Line of Credit      
Debt Instrument [Line Items]      
Unused fee percentage 0.35% 1.00% 0.50%
Credit Facility | Line of Credit | Revolving Line of Credit | Secured Overnight Financing Rate (SOFR)      
Debt Instrument [Line Items]      
Debt instrument, basis spread on variable rate   3.10% 2.81%
[1] 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.
[2] Cumulative gross unrealized depreciation for federal income tax purposes is $52.3 million; cumulative gross unrealized appreciation for federal income tax purposes is $35.2 million. Cumulative net unrealized depreciation is $17.1 million, based on a tax cost of $666.7 million.