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Investments - Consolidated Statements of Assets and Liabilities for PSSL (Parenthetical) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Sep. 30, 2023
Investments at cost $ 1,290,478 $ 1,092,878
Cash and cash equivalents, cost 75,809 100,555
2031 Asset Backed Debt payable, par 228,000 228,000
PennantPark Senior Secured Loan Fund I LLC    
Investments at cost 847,548 804,608
Cash and cash equivalents, cost 36,339 77,446
2031 Asset Backed Debt payable, par 246,000 246,000
2035 Asset backed debt payable, par 246,000 246,000
Unfunded commitments to fund investments $ 1,600 $ 1,100