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Investments - Summary of Listing of PSSL's Individual Investments (Parenthetical) (Details)
 12 Months Ended
Sep. 30, 2022
Sep. 30, 2023
Investment, Identifier [Axis]: Cash and Cash Equivalents - 53.4%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets 53.40%  
Investment, Identifier [Axis]: First Lien Secured Debt - 1,330.4%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets 1330.40%  
Investment, Identifier [Axis]: Related Party PSSL Equity Securities - 0.3%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 0.30%  
Investment, Identifier [Axis]: Related Party PSSL First Lien Secured Debt - 1,464.6%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets   1347.50%
Investment, Identifier [Axis]: Related Party PSSL Members Equity-100.0%    
Schedule of Investments [Line Items]    
Investment owned, percent of members' equity 100.00%  
Investment, Identifier [Axis]: Related Party PSSL Second Lien Secured Debt - 5.2%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 5.20%  
Investment, Identifier [Axis]: Related Party PSSL, Cash and Cash Equivalents - 133.2%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets   133.20%
Investment, Identifier [Axis]: Related Party PSSL, Equity - 100.0%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets   100.00%
Investment, Identifier [Axis]: Related Party PSSL, Equity Securities - 3.9%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets   3.90%
Investment, Identifier [Axis]: Related Party PSSL, Liabilities in Excess of Other Assets — (1,385.4)%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets   1385.40%
Investment, Identifier [Axis]: Related Party PSSL, Total Investments - 1,351.4%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets   1351.40%
Investment, Identifier [Axis]: Related Party PSSL, Total Investments and Cash Equivalents —1,485.4%    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets   1485.40%
Investment, Identifier [Axis]: Total Investments - 1,335.9%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets 1335.90%