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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