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Investments - Summary of PSSL's Portfolio at Fair Value (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2022 USD ($) Portfolio | Sep. 30, 2021 USD ($) Portfolio
Schedule Of Investments [Line Items] |  |  |
Fair Value | $ 1,164,254 | [1],[2],[3] | $ 1,081,619
PennantPark Senior Secured Loan Fund I LLC |  |  |
Schedule Of Investments [Line Items] |  |  |
Fair Value | $ 754,722 |  | $ 564,783
Weighted average cost yield on income producing investments | 9.60% |  | 7.10%
Number of portfolio companies in PSSL | Portfolio | 95 |  | 74
Largest portfolio company investment | $ 19,250 |  | $ 18,933
Total of five largest portfolio company investments | $ 86,872 |  | $ 84,287
[1] | 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.
[2] | 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.
[3] | Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).

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