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Investments - Summary of PSSLs Portfolio at Fair Value (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) Portfolio	Sep. 30, 2023 USD ($) Portfolio
Schedule Of Investments [Line Items]
Fair Value	$ 1,658,944	$ 1,067,174
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Fair Value	$ 904,179	$ 785,859
Weighted average cost yield on income producing investments	11.90%	12.10%
Number of portfolio companies in PSSL | Portfolio	108	105
Largest portfolio company investment	$ 21,328	$ 18,463
Total of five largest portfolio company investments	$ 98,172	$ 83,365

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