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Investments - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2023
USD ($)
Jun. 30, 2024
USD ($)
Portfolio
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Portfolio
Jun. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Portfolio
May 31, 2024
USD ($)
Mar. 31, 2024
USD ($)
Apr. 30, 2023
USD ($)
Jan. 31, 2021
USD ($)
Schedule Of Investments [Line Items]                    
Purchases of investments, including PIK interest   $ 321,500 $ 80,300 $ 964,000 $ 231,500          
Sales and repayments of investments   137,600 $ 132,400 386,300 $ 258,100          
Total assets   1,756,896   $ 1,756,896   $ 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   218,862   $ 218,862   9,400        
Credit facility interest rate description SOFR plus 260 basis points                  
Debt securitization             $ 300,700   $ 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   $ 958,802   $ 958,802   $ 869,410        
Number of portfolio companies consisted of debt investments | Portfolio   108   108   105        
Percentage of capital ownership in each of outstanding subordinated notes and equity interests       87.50%   12.50%        
Line of credit   $ 116,100   $ 116,100   $ 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   21,300   21,300   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   98,200   98,200   83,400        
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt                    
Schedule Of Investments [Line Items]                    
Total investments   237,700   237,700   210,100        
Additional unfunded investment   0   0   27,600        
PennantPark Senior Secured Loan Fund I LLC | Equity Interests                    
Schedule Of Investments [Line Items]                    
Total investments   101,900   101,900   $ 90,000        
Additional unfunded investment   $ 0   $ 0       $ 11,800