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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Jun. 30, 2025
Sep. 30, 2024
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 102,730 $ 112,050
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents 102,726 112,046
Total investments and cash and cash equivalents 2,557,536 2,106,986
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,930,158 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 12,032 2,632
Cost | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 151,245 131,312
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]    
Cash and cash equivalents 102,730 112,050
Total investments and cash and cash equivalents 2,506,245 2,095,554
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,912,951 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 12,506 2,693
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 187,119 177,635
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 53,289 56,478
Total Investments [Member] | Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,454,810 1,994,940
Total Investments [Member] | Fair Value    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 2,403,515 $ 1,983,504