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Investments - Summary of PSSLs Portfolio at Fair Value (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) Portfolio	Sep. 30, 2024 USD ($) Portfolio
Schedule Of Investments [Line Items]
Total investments	$ 2,344,052	$ 1,983,504
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Total investments	$ 1,060,161	$ 913,281
Weighted average cost yield on income producing investments	10.50%	11.40%
Number of portfolio companies in PSSL | Portfolio	118	109
Largest portfolio company investment	$ 21,167	$ 21,274
Total of five largest portfolio company investments	$ 98,701	$ 97,292

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