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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Sep. 30, 2022
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 100,555 $ 51,488
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,092,878 1,177,357
Cash and cash equivalents 100,555 51,525
Total investments and cash and cash equivalents 1,193,433 1,228,882
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 708,452 838,842
Cost | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 210,088 190,181
Cost | Second lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,113 1,113
Cost | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 83,188 65,715
Cost | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 90,038 81,506
Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,067,174 1,164,254
Cash and cash equivalents 100,555 51,488
Total investments and cash and cash equivalents 1,167,729 1,215,742
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 696,078 819,461
Fair Value | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 210,088 190,181
Fair Value | Second lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 149 147
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 109,978 105,031
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 50,881 $ 49,434