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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Sep. 30, 2023
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 112,050 $ 100,555
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,994,940 1,092,878
Cash and cash equivalents 112,046 100,555
Total investments and cash and cash equivalents 2,106,986 1,193,433
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,521,496 708,452
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 0 1,113
Cost | Subordinated Debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,632 0
Cost | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 131,312 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 1,983,504 1,067,174
Cash and cash equivalents 112,050 100,555
Total investments and cash and cash equivalents 2,095,554 1,167,729
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,509,048 696,078
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 0 149
Fair Value | Subordinated Debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,693 0
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 177,635 109,978
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 56,478 $ 50,881