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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Investments at cost | $ 1,140,433 | $ 1,177,357
Cash and cash equivalents, cost | 59,092 | 47,916
2031 Asset Backed Debt payable, par | 228,000 | 228,000
PennantPark Senior Secured Loan Fund I LLC |  |
Investments at cost | 827,107 | 770,280
Cash and cash equivalents, cost | 37,943 | 33,725
2031 Asset Backed Debt payable, par | 246,000 | 246,000
2035 Asset backed debt payable, par | 246,000 | 246,000
Unfunded commitments to fund investments | $ 2,000 | $ 2,500

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