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Investments - Summary of Listing of PSSL's Individual Investments (Parenthetical) (Details)
 9 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Sep. 30, 2022
Investment, Identifier [Axis]: Cash and Cash Equivalents - 59.7%      
Schedule of Investments [Line Items]      
Investment owned, percent of liabilities in excess of other assets   59.70%  
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]: Liabilities in Excess of Other Assets — (1,229.0)%      
Schedule of Investments [Line Items]      
Investment owned, percent of liabilities in excess of other assets (1229.00%)    
Investment, Identifier [Axis]: Related Party PSSL Equity Securities - 0.4%      
Schedule of Investments [Line Items]      
Investment owned, percentage of net assets 0.40%   0.30%
Investment, Identifier [Axis]: Related Party PSSL First Lien Secured Debt - 1,464.6%      
Schedule of Investments [Line Items]      
Investment owned, percentage of net assets 1464.60%    
Investment, Identifier [Axis]: Related Party PSSL Investments and Cash Equivalents —1,329.0%      
Schedule of Investments [Line Items]      
Investment owned, percentage of net assets 1329.00%   1395.60%
Investment, Identifier [Axis]: Related Party PSSL Liabilities in Excess of Other Assets — (1,229.0)%      
Schedule of Investments [Line Items]      
Investment owned, percent of liabilities in excess of other assets     (1295.60%)
Investment, Identifier [Axis]: Related Party PSSL Members Equity-100.0%      
Schedule of Investments [Line Items]      
Investment owned, percent of members' equity 100.00%   100.00%
Investment, Identifier [Axis]: Related Party PSSL Related Party PSSL,First Lien Secured Debt - 1,464.6%      
Schedule of Investments [Line Items]      
Investment owned, percentage of net assets 1469.60%    
Investment, Identifier [Axis]: Related Party PSSL Related Party PSSL,First Lien Secured Debt - 69.3%      
Schedule of Investments [Line Items]      
Investment owned, percentage of net assets 69.30%    
Investment, Identifier [Axis]: Related Party PSSL Second Lien Secured Debt - 5.0%      
Schedule of Investments [Line Items]      
Investment owned, percentage of net assets     5.20%
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%