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Investments - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Aug. 31, 2023
USD ($)
Dec. 31, 2023
USD ($)
Portfolio
Dec. 31, 2022
USD ($)
Sep. 30, 2023
USD ($)
Portfolio
Apr. 30, 2023
USD ($)
Jan. 31, 2021
USD ($)
Schedule Of Investments [Line Items]            
Purchases of investments, including PIK interest   $ 303,500 $ 65,600      
Sales and repayments of investments   103,800 $ 63,000      
Total assets   $ 1,359,059   $ 1,179,611    
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.        
Line of credit   $ 260,917   9,400    
Credit facility interest rate description SOFR plus 260 basis points          
Debt securitization         $ 297,800 $ 300,700
SOFR            
Schedule Of Investments [Line Items]            
Percentage points added to reference rate 260.00%          
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]            
Line of credit $ 325,000          
PennantPark Senior Secured Loan Fund I LLC            
Schedule Of Investments [Line Items]            
Total assets   $ 879,393   $ 869,410    
Number of portfolio companies consisted of debt investments | Portfolio   106   105    
Percentage of capital ownership in each of outstanding subordinated notes and equity interests   87.50%   12.50%    
Line of credit   $ 75,600   $ 48,600    
PennantPark Senior Secured Loan Fund I LLC | Senior Secured Revolving Credit Facility            
Schedule Of Investments [Line Items]            
Line of credit $ 260,000          
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   21,100   18,500    
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments            
Schedule Of Investments [Line Items]            
Fair value of investment in five largest portfolio company   91,700   83,400    
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt            
Schedule Of Investments [Line Items]            
Total investments   210,100   210,100    
Additional unfunded investment   27,600   27,600    
PennantPark Senior Secured Loan Fund I LLC | Equity Interests            
Schedule Of Investments [Line Items]            
Total investments   90,000   90,000    
Additional unfunded investment   $ 11,800        
Additional unfunded investment in equity       $ 11,800