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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Sep. 30, 2023
--- | --- | ---
Investments at cost | $ 1,674,684 | $ 1,092,878
Cash and cash equivalents, cost | 84,589 | 100,555
PennantPark Senior Secured Loan Fund I LLC |  |
Investments at cost | 919,058 | 804,608
Cash and cash equivalents, cost | 47,077 | 77,446
Asset-backed debt payable, par | 246,000 | 246,000
2035 Asset backed debt payable, par | 246,000 | 246,000
2036 Asset-backed debt | 246,000 | 246,000
Unfunded commitments to fund investments | $ 1,000 | $ 1,100

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