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Investments - Summary of PSSL's Portfolio at Fair Value (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2023 USD ($) Portfolio	Sep. 30, 2022 USD ($) Portfolio
Schedule Of Investments [Line Items]
Fair Value	$ 1,105,265	$ 1,164,254
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Fair Value	$ 805,217	$ 754,722
Weighted average cost yield on income producing investments	12.00%	9.60%
Number of portfolio companies in PSSL | Portfolio	105	95
Largest portfolio company investment	$ 17,697	$ 19,250
Total of five largest portfolio company investments	$ 83,746	$ 86,872

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