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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | ---
Investments at cost | $ 1,181,025 | $ 1,177,357
Cash and cash equivalents, cost | 52,944 | 47,917
Asset backed debt payable, par | 228,000 | 228,000
PennantPark Senior Secured Loan Fund I LLC |  |
Investments at cost | 772,064 | 770,280
Cash and cash equivalents, cost | 41,692 | 33,725
Asset backed debt payable, par | 246,000 | 246,000
Unfunded commitments to fund investments | $ 3,900 | $ 2,500

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- Definition Cost of the investment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 + Details
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