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Investments - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2024
USD ($)
Portfolio
Dec. 31, 2024
USD ($)
Portfolio
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Portfolio
May 31, 2024
USD ($)
Apr. 30, 2023
USD ($)
Jan. 31, 2021
USD ($)
Schedule Of Investments [Line Items]              
Purchases of investments, including PIK interest   $ 608,300 $ 303,500        
Sales and repayments of investments   401,300 $ 103,800        
Total assets $ 2,344,201 $ 2,344,201   $ 2,108,845      
Number of members appointed   four          
Quorum description   Quorum is defined as (i) the presence of two members of the board of directors or investment committee, provided that at least one individual is present that was elected, designated or appointed by each member; (ii) the presence of three members of the board of directors or investment committee, provided that the individual that was elected, designated or appointed by the member with only one individual present shall be entitled to cast two votes on each matter; and (iii) the presence of four members of the board of directors or investment committee shall constitute a quorum, provided that two individuals are present that were elected, designated or appointed by each member.          
Credit Facility payable, at fair value (cost-$608,855 and $443,885, respectively) $ 608,791 $ 608,791   443,880      
Credit facility interest rate description SOFR plus 225 basis points            
Debt securitization         $ 300,700 $ 297,800 $ 300,700
Pennant Park C L O I I Ltd              
Schedule Of Investments [Line Items]              
Asset backed debt, transfer of assets, description   On the closing date of the transaction, in consideration of PSSL’s transfer to PennantPark CLO II, Ltd. of the initial closing date loan portfolio, which included loans distributed to PSSL by certain of its wholly owned subsidiaries and us, PennantPark CLO II, Ltd. transferred to PSSL 100% of the Preferred Shares of PennantPark CLO II, Ltd. and 100% of the Class E Notes issued by PennantPark CLO II, Ltd.          
PennantPark CLO VI, LLC              
Schedule Of Investments [Line Items]              
Asset backed debt, transfer of assets, description   On the closing date of the transaction, in consideration of PSSL’s transfer to PennantPark CLO VI, LLC of the initial closing date loan portfolio, which included loans distributed to PSSL by certain of its wholly owned subsidiaries and us, PennantPark CLO VI, LLC transferred to PSSL 100% of the Preferred Shares of CLO VI, LLC.          
Senior Secured Revolving Credit Facility              
Schedule Of Investments [Line Items]              
Credit Facility payable, at fair value (cost-$608,855 and $443,885, respectively) $ 260,000 $ 260,000          
PennantPark Senior Secured Loan Fund I LLC              
Schedule Of Investments [Line Items]              
Total assets $ 1,109,630 $ 1,109,630   $ 988,122      
Number of portfolio companies consisted of debt investments | Portfolio 118 118   109      
Percentage of capital ownership in each of outstanding subordinated notes and equity interests   87.50%   12.50%      
Credit Facility payable, at fair value (cost-$608,855 and $443,885, respectively) $ 259,100 $ 259,100   $ 146,100      
PennantPark Senior Secured Loan Fund I LLC | Senior Secured Revolving Credit Facility              
Schedule Of Investments [Line Items]              
Credit Facility payable, at fair value (cost-$608,855 and $443,885, respectively) 325,000 325,000          
PennantPark Senior Secured Loan Fund I LLC | Investment In Single Portfolio Company              
Schedule Of Investments [Line Items]              
Fair value of largest investment in a single portfolio company 21,200 21,200   21,300      
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments              
Schedule Of Investments [Line Items]              
Fair value of investment in five largest portfolio company 98,600 98,600   97,300      
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt              
Schedule Of Investments [Line Items]              
Total investments 237,700 237,700   237,700      
Additional unfunded investment 0 0   0      
PennantPark Senior Secured Loan Fund I LLC | Equity Interests              
Schedule Of Investments [Line Items]              
Total investments 101,900 101,900   101,900      
Additional unfunded investment in equity $ 87,500 $ 87,500   $ 0