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Investments - Schedule of Investments and Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Sep. 30, 2024
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Cash and cash equivalents $ 111,358 $ 112,050
Cost    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 2,405,219 1,994,940
Cash and cash equivalents 111,368 112,046
Total investments and cash and cash equivalents 2,516,587 2,106,986
Cost | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,893,825 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 3,947 2,632
Cost | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 146,072 131,312
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 2,344,052 1,983,504
Cash and cash equivalents 111,358 112,050
Total investments and cash and cash equivalents 2,455,410 2,095,554
Fair Value | First lien    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 1,862,523 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 4,384 2,693
Fair Value | Equity    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments 179,855 177,635
Fair Value | Equity interests in PSSL    
Schedule Of Investment Income Reported Amounts By Category [Line Items]    
Total investments $ 59,640 $ 56,478