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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Investments at cost | $ 1,994,940 | $ 1,092,878
Cash and cash equivalents, cost | 112,046 | 100,555
PennantPark Senior Secured Loan Fund I LLC |  |
Investments at cost | 928,983 | 804,608
Cash and cash equivalents, cost | 68,429 | 77,446
Asset backed debt payable, par | 0 | 246,000
2035 Asset-backed debt, net | 246,000 | 246,000
2036 Asset-backed debt, net | 246,000 | 0
Unfunded commitments to fund investments | $ 600 | $ 1,100

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