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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Sep. 30, 2024
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and Cash Equivalents, Cost $ 122,688 $ 112,050
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,819,393 1,994,940
Cash and Cash Equivalents, Cost 122,684 112,046
Total investments and cash and cash equivalents 2,942,077 2,106,986
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,289,071 1,521,496
Cost | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 237,650 237,650
Cost | Second lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 995 0
Cost | Subordinated Debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 17,387 2,632
Cost | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 150,565 131,312
Cost | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 123,725 101,850
Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,773,328 1,983,504
Cash and Cash Equivalents, Cost 122,688 112,050
Total investments and cash and cash equivalents 2,896,016 2,095,554
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,275,982 1,509,048
Fair Value | First lien in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 237,650 237,650
Fair Value | Second lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 995 0
Fair Value | Subordinated Debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 17,986 2,693
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 196,397 177,635
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 44,318 $ 56,478