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Investments - Summary of Listing of PSSL's Individual Investments (Parenthetical) (Details) | 3 Months Ended | 12 Months Ended
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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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