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Investments - Summary of PSSL's Portfolio at Fair Value (Details) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2023 USD ($) Portfolio	Sep. 30, 2023 USD ($) Portfolio
Schedule Of Investments [Line Items]
Fair Value	$ 1,270,927	$ 1,067,174
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Fair Value	$ 836,857	$ 785,859
Weighted average cost yield on income producing investments	12.10%	12.10%
Number of portfolio companies in PSSL | Portfolio	106	105
Largest portfolio company investment	$ 21,114	$ 18,463
Total of five largest portfolio company investments	$ 91,715	$ 83,365

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