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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Sep. 30, 2024
--- | --- | ---
Investments at cost | $ 2,405,219 | $ 1,994,940
Cash and cash equivalents, cost | 111,368 | 112,046
PennantPark Senior Secured Loan Fund I LLC |  |
Investments at cost | 1,091,005 | 928,983
Cash and cash equivalents, cost | 48,624 | 68,429
2035 Asset backed debt payable, par | 246,000 | 246,000
2036 Asset-backed debt | 246,000 | 246,000
Unfunded commitments to fund investments | $ 0 | $ 600

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