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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 75,826 $ 100,555
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,290,478 1,092,878
Cash and cash equivalents 75,809 100,555
Total investments and cash and cash equivalents 1,366,287 1,193,433
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 887,271 708,452
Cost | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 210,088 210,088
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 101,968 83,188
Cost | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 90,038 90,038
Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,270,927 1,067,174
Cash and cash equivalents 75,826 100,555
Total investments and cash and cash equivalents 1,346,753 1,167,729
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 880,376 696,078
Fair Value | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 210,088 210,088
Fair Value | Second lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 150 149
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 128,184 109,978
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 52,129 $ 50,881