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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Sep. 30, 2023
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 84,590 $ 100,555
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,674,684 1,092,878
Cash and cash equivalents 84,589 100,555
Total investments and cash and cash equivalents 1,759,273 1,193,433
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,219,920 708,452
Cost | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 237,650 210,088
Cost | Second lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 148 1,113
Cost | Subordinate debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,003 0
Cost | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 114,113 83,188
Cost | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 101,850 90,038
Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,658,944 1,067,174
Cash and cash equivalents 84,590 100,555
Total investments and cash and cash equivalents 1,743,534 1,167,729
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,211,556 696,078
Fair Value | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 237,650 210,088
Fair Value | Second lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 150 149
Fair Value | Subordinate debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,003 0
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 149,240 109,978
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 59,345 $ 50,881