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Investments - Summary of PSSL's Portfolio at Fair Value (Details)
$ in Thousands
12 Months Ended
Sep. 30, 2024
USD ($)
Portfolio
Sep. 30, 2023
USD ($)
Portfolio
Schedule Of Investments [Line Items]    
Total investments $ 1,983,504 $ 1,067,174
PennantPark Senior Secured Loan Fund I LLC    
Schedule Of Investments [Line Items]    
Total investments 913,281 785,859
PennantPark Senior Secured Loan Fund LLC Portfolio    
Schedule Of Investments [Line Items]    
Total investments $ 913,281 $ 785,859
Weighted average cost yield on income producing investments 11.40% 12.10%
Number of portfolio companies in PSSL | Portfolio 109 105
Largest portfolio company investment $ 21,274 $ 18,463
Total of five largest portfolio company investments $ 97,292 $ 83,365