Quarterly report [Sections 13 or 15(d)]

INVESTMENTS - Schedule of Contractual Principal Repayment and Maturity (Details)

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INVESTMENTS - Schedule of Contractual Principal Repayment and Maturity (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Sep. 30, 2025
 [1]
Investments, Debt and Equity Securities [Abstract]    
2026 $ 13,626  
2027 137,238  
2028 160,674  
2029 147,753  
2030 264,495  
Thereafter 118,910  
Total contractual repayments 842,696  
Adjustments to cost basis of debt investments (1,282)  
Investments in equity securities 83,779  
Investment owned, at cost 925,193 $ 876,614
Debt investments with maturity dates prior to period end $ 200  
[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.