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Investments - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
May 31, 2022
USD ($)
Jun. 30, 2023
USD ($)
Portfolio
Jun. 30, 2022
USD ($)
Mar. 31, 2023
Jun. 30, 2023
USD ($)
Portfolio
Jun. 30, 2022
USD ($)
Sep. 30, 2022
USD ($)
Portfolio
Apr. 30, 2023
USD ($)
Apr. 30, 2022
USD ($)
Jan. 31, 2021
USD ($)
Schedule Of Investments [Line Items]                    
Purchases of investments, including PIK interest   $ 80,300,000 $ 105,100,000   $ 231,500,000 $ 554,300,000        
Sales and repayments of investments   132,400,000 $ 55,000,000   258,100,000 $ 397,200,000        
Total assets   1,183,223,000     $ 1,183,223,000   $ 1,223,866,000      
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   63,917,000     $ 63,917,000   167,563,000      
Credit facility interest rate description SOFR plus 260 basis points                  
Debt securitization               $ 297,800,000   $ 300,700,000
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 Subordinated Notes CLO VI, LLC          
Senior Secured Revolving Credit Facility                    
Schedule Of Investments [Line Items]                    
Line of credit $ 325,000,000               $ 225,000,000  
PennantPark Senior Secured Loan Fund I LLC                    
Schedule Of Investments [Line Items]                    
Total assets   $ 848,440,000     $ 848,440,000   $ 796,811,000      
Number of portfolio companies consisted of debt investments | Portfolio   105     105   95      
Percentage of capital ownership in each of outstanding subordinated notes and equity interests         87.50%   12.50%      
Line of credit   $ 41,300,000     $ 41,300,000   $ 259,500,000      
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   17,700,000     17,700,000   19,300,000      
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments                    
Schedule Of Investments [Line Items]                    
Fair value of investment in five largest portfolio company   83,700,000     83,700,000   86,900,000      
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt                    
Schedule Of Investments [Line Items]                    
Total investments   210,100,000     210,100,000   190,200,000      
Additional unfunded investment   0     0   19,900,000      
PennantPark Senior Secured Loan Fund I LLC | Equity Interests                    
Schedule Of Investments [Line Items]                    
Total investments   90,000,000     90,000,000   81,500,000      
Additional unfunded investment in equity   $ 0     $ 0   $ 8,500,000