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Investments - Summary of PSSL's Portfolio at Fair Value (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2023 USD ($) Portfolio	Sep. 30, 2022 USD ($) Portfolio
Schedule Of Investments [Line Items]
Fair Value	$ 1,067,174	$ 1,164,254
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Fair Value	$ 785,859	$ 754,722
Weighted average cost yield on income producing investments	12.10%	9.60%
Number of portfolio companies | Portfolio	105	95
Largest portfolio company investment	$ 18,463	$ 19,250
Total of five largest portfolio company investments	$ 83,365	$ 86,872

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