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Investments - Summary of Listing of PSSLs Individual Investments (Parenthetical) (Details)
 9 Months Ended 12 Months Ended
Jun. 30, 2024
Sep. 30, 2023
Investment, Identifier [Axis]: Related Party PSSL Cash and Cash Equivalents - 103.61%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets 69.40%  
Investment, Identifier [Axis]: Related Party PSSL Equity - 100.0%    
Schedule of Investments [Line Items]    
Investment owned, percent of members' equity 100.00%  
Investment, Identifier [Axis]: Related Party PSSL Equity Securities - 6.9%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets 6.90%  
Investment, Identifier [Axis]: Related Party PSSL First Lien Secured Debt - 1,347.5%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets   1347.50%
Investment, Identifier [Axis]: Related Party PSSL First Lien Secured Debt - 1,425.9%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets 1327.40%  
Investment, Identifier [Axis]: Related Party PSSL Investments and Cash Equivalents —1,536.4%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets 1536.40%  
Investment, Identifier [Axis]: Related Party PSSL Liabilities in Excess of Other Assets — (1,436.4)%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets (1436.40%)  
Investment, Identifier [Axis]: Related Party PSSL, Cash and Cash Equivalents - 133.2%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets   133.20%
Investment, Identifier [Axis]: Related Party PSSL, Equity - 100.0%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets   100.00%
Investment, Identifier [Axis]: Related Party PSSL, Equity Securities - 3.9%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets   3.90%
Investment, Identifier [Axis]: Related Party PSSL, Liabilities in Excess of Other Assets — (1,384.6)%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets   (1384.60%)
Investment, Identifier [Axis]: Related Party PSSL, Total Investments - 1,351.4%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets   1351.40%
Investment, Identifier [Axis]: Related Party PSSL, Total Investments and Cash Equivalents —1,484.6%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets   1484.60%
Investment, Identifier [Axis]: Total Investments - 1,432.8%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets 1333.10%