v3.26.1
Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 1,228,191 $ 1,236,888
Cash and Cash Equivalents, Cost Value 39,252 51,739
Total investments and cash and cash equivalents 1,267,443 1,288,627
Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,193,172 1,287,273
Cash and Cash Equivalents, Cost Value 39,252 51,783
Total investments and cash and cash equivalents 1,232,424 1,339,056
First Lien | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 457,595 606,949
First Lien | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 424,547 582,373
US Government Securities [Member] | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 269,308 124,809
US Government Securities [Member] | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 269,266 124,788
Second Lien | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 15,242 18,619
Second Lien | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 14,806 18,161
Subordinated Debt / Corporate Notes | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 68,580 60,575
Subordinated Debt / Corporate Notes | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 68,894 60,933
Subordinated Notes in PSLF | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 140,287 140,287
Subordinated Notes in PSLF | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 140,287 140,287
Equity | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 194,821 203,291
Equity | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 223,753 293,218
Equity in PSLF | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 82,358 82,358
Equity in PSLF | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 51,619 $ 67,513