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Investments - Summary of Listing of PSSL's Individual Investments (Parenthetical) (Details)	12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Investment owned, percent of net assets	1335.90%	1101.70%
Investment owned, percent of liabilities in excess of other assets	(1229.00%)	(1057.10%)
Investment owned, percent of members' equity	100.00%	100.00%
PennantPark Senior Secured Loan Fund I LLC | Cash and Cash Equivalents
Schedule Of Investments [Line Items]
Investment owned, percent of net assets	59.70%	55.30%
PennantPark Senior Secured Loan Fund I LLC | Investments and Cash Equivalents
Schedule Of Investments [Line Items]
Investment owned, percent of net assets	1329.00%	1157.10%
PennantPark Senior Secured Loan Fund I LLC | Equity Securities
Schedule Of Investments [Line Items]
Investment owned, percent of net assets	0.40%	3.30%
First Lien Secured Debt - 1,280.8%
Schedule Of Investments [Line Items]
Investment owned, percent of net assets	1330.40%
First Lien Secured Debt - 1,088.% | PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Investment owned, percent of net assets		1088.00%
Second Lien Secured Debt | PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Investment owned, percent of net assets	5.00%	10.50%

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