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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Sep. 30, 2023
Investments at cost $ 1,489,679 $ 1,092,878
Cash and cash equivalents, cost 125,246 100,555
PennantPark Senior Secured Loan Fund I LLC    
Investments at cost 879,528 804,608
Cash and cash equivalents, cost 62,892 77,446
Asset-backed debt payable, par 246,000 246,000
2035 Asset backed debt payable, par 246,000 246,000
Unfunded commitments to fund investments $ 1,200 $ 1,100