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Investments - Summary of Listing of PSSLs Individual Investments (Parenthetical) (Details)
 6 Months Ended 12 Months Ended
Mar. 31, 2025
Sep. 30, 2024
Investment, Identifier [Axis]: Related Party PSSL Equity - 100.0%    
Schedule of Investments [Line Items]    
Investment owned, percent of members' equity [1] 100.00%  
Investment, Identifier [Axis]: Related Party PSSL First Lien Secured Debt - 1,404.5%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets [2]   1404.50%
Investment, Identifier [Axis]: Related Party PSSL First Lien Secured Debt - 1,548.7%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets [1] 1548.70%  
Investment, Identifier [Axis]: Related Party PSSL Liabilities in Excess of Other Assets — (1,871.0)%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets [1] 1871.00%  
Investment, Identifier [Axis]: Related Party PSSL Total Investments and Cash Equivalents —1,971.0%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [1] 1971.00%  
Investment, Identifier [Axis]: Related Party PSSL, Cash and Cash Equivalents - 106.0%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [2]   106.00%
Investment, Identifier [Axis]: Related Party PSSL, Cash and Cash Equivalents - 71.3%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [1] 71.30%  
Investment, Identifier [Axis]: Related Party PSSL, Equity Securities - 10.5%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [2]   10.50%
Investment, Identifier [Axis]: Related Party PSSL, Equity Securities - 7.6%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [1] 7.60%  
Investment, Identifier [Axis]: Related Party PSSL, Liabilities in Excess of Other Assets — (1,421.0)%    
Schedule of Investments [Line Items]    
Investment owned, percent of liabilities in excess of other assets [2]   1421.00%
Investment, Identifier [Axis]: Related Party PSSL, Members' Equity—100.0%    
Schedule of Investments [Line Items]    
Investment owned, percent of members' equity [2]   100.00%
Investment, Identifier [Axis]: Related Party PSSL, Total Investments - 1,415.0%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [2]   1415.00%
Investment, Identifier [Axis]: Related Party PSSL, Total Investments - 1,555.30%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [1] 1555.50%  
Investment, Identifier [Axis]: Related Party PSSL, Total Investments and Cash Equivalents —1,521.0%    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [2]   1521.00%
[1] All investments are in U.S. companies unless noted otherwise.
[2] All investments are in U.S. companies unless noted otherwise.