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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Sep. 30, 2024
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 102,262 $ 112,050
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,234,293 1,994,940
Cash and cash equivalents 102,273 112,046
Total investments and cash and cash equivalents 2,336,566 2,106,986
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,746,097 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 | Subordinate debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 3,144 2,632
Cost | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 145,552 131,312
Cost | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 101,850 101,850
Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,193,910 1,983,504
Cash and cash equivalents 102,262 112,050
Total investments and cash and cash equivalents 2,296,172 2,095,554
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,726,126 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 | Subordinate debt    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 3,435 2,693
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 177,788 177,635
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 48,911 $ 56,478