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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Sep. 30, 2022
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 59,092 $ 47,880
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,140,434 1,177,357
Cash and cash equivalents 59,092 47,917
Total investments and cash and cash equivalents 1,199,526 1,225,274
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 758,292 838,842
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 80,903 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 1,105,265 1,164,254
Cash and cash equivalents 59,092 47,880
Total investments and cash and cash equivalents 1,164,357 1,212,134
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 740,156 819,461
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 106,931 105,031
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 47,941 $ 49,434