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Investments - Summary of Listing of PSSL's Individual Investments (Parenthetical) (Details)	3 Months Ended	12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022
PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Investment owned, percentage of net assets	1360.10%	1335.90%
Investment owned, percent of liabilities in excess of other assets	(1229.00%)	(1229.00%)
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, percentage of net assets	75.50%	59.70%
PennantPark Senior Secured Loan Fund I LLC | Total Investments and Cash Equivalents
Schedule Of Investments [Line Items]
Investment owned, percentage of net assets	1329.00%	1329.00%
PennantPark Senior Secured Loan Fund I LLC | Equity Securities
Schedule Of Investments [Line Items]
Investment owned, percentage of net assets	0.40%	0.40%
First Lien Secured Debt - 1,354.1%
Schedule Of Investments [Line Items]
Investment owned, percentage of net assets	1354.10%
First Lien Secured Debt - 1,330.4%
Schedule Of Investments [Line Items]
Investment owned, percentage of net assets		1330.40%
Second Lien Secured Debt | PennantPark Senior Secured Loan Fund I LLC
Schedule Of Investments [Line Items]
Investment owned, percentage of net assets	5.00%	5.00%

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