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Investments - Summary of Listing of PSSLs Individual Investments (Parenthetical) (Details)
 9 Months Ended 12 Months Ended
Jun. 30, 2025
Sep. 30, 2024
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 221.00% [1] 226.10% [2],[3],[4]
Liabilities in Excess of Other Assets, Percent of Net Asset (130.50%) (138.90%)
First Lien Secured Debt [Member]    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [5] 1707.40%  
Investment owned, percent of liabilities in excess of other assets [6]   1404.50%
Liabilities in Excess of Other Assets    
Schedule of Investments [Line Items]    
Liabilities in Excess of Other Assets, Percent of Net Asset (1708.00%) [5] (1421.00%) [6]
Cash and Cash Equivalents [Member]    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 75.10% [5] 106.00% [6]
Investments And Cash Equivalents [Member]    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 1808.00% [5] 1521.00% [6]
Equity Securities [Member]    
Schedule of Investments [Line Items]    
Investment owned, percentage of net assets [5] 13.60%  
Investment owned, percent of liabilities in excess of other assets [6]   10.50%
Total Investments [Member]    
Schedule of Investments [Line Items]    
Investment owned, percent of net assets 1733.20% [5] 1415.00% [6]
Members' Equity [Member]    
Schedule of Investments [Line Items]    
Investment owned, percent of members' equity 100.00% [5] 100.00% [6]
[1] As of June 30, 2025, all investments are in U.S. companies.
[2] The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[3] The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities.
[4] All investments are in U.S. companies unless noted otherwise.
[5] All investments are in U.S. companies unless noted otherwise.
[6] All investments are in U.S. companies unless noted otherwise.