Quarterly report pursuant to Section 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, 2024
Sep. 30, 2023
Debt Instrument [Line Items]    
Fair Value $ 791,588 $ 704,815 [1]
Collateral Pledged    
Debt Instrument [Line Items]    
Fair Value $ 708,000 $ 628,300
Credit Facility | Line of Credit | Revolving Line of Credit    
Debt Instrument [Line Items]    
Unused fee percentage 0.75% 1.00%
Credit Facility | Line of Credit | Revolving Line of Credit | SOFR    
Debt Instrument [Line Items]    
Debt instrument, basis spread on variable rate 0.10% 3.10%
[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.