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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, 2025
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Apr. 30, 2025
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Dec. 31, 2024
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Jun. 30, 2025
USD ($)
Portfolio
Jun. 30, 2024
USD ($)
Mar. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Portfolio
Jun. 30, 2024
USD ($)
Sep. 30, 2024
USD ($)
Portfolio
May 31, 2024
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Apr. 30, 2023
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Jan. 31, 2021
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Schedule Of Investments [Line Items]                        
Purchases of investments, including PIK interest       $ 209,200,000 $ 321,500,000   $ 1,112,500,000 $ 964,000,000        
Sales and repayments of investments       145,800,000 $ 137,600,000   669,500,000 $ 386,300,000        
Total assets       2,521,602,000     $ 2,521,602,000   $ 2,108,845,000      
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.          
Credit Facility payable, at fair value (cost-$298,855 and $443,855, respectively)       298,865,000     $ 298,865,000   443,880,000      
Credit facility interest rate description     SOFR plus 225 basis points                  
Debt securitization                   $ 300,700,000 $ 297,800,000 $ 300,700,000
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.          
Debt instrument $ 315,800,000                      
PennantPark CLO VI, LLC | Class Loans A-R                        
Schedule Of Investments [Line Items]                        
Debt instrument $ 228,000,000                      
Interest rate 1.85%                      
PennantPark CLO VI, LLC | Class Loans B-R                        
Schedule Of Investments [Line Items]                        
Debt instrument $ 18,000                      
PennantPark CLO VI, LLC | Class Loans C-R                        
Schedule Of Investments [Line Items]                        
Debt instrument $ 18,000                      
Interest rate 4.50%                      
PennantPark CLO VI, LLC | Sub Notes                        
Schedule Of Investments [Line Items]                        
Debt instrument $ 51,800                      
PennantPark CLO 12, LLC                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 301,000,000                    
Issuance date   2029-04                    
Maturity date   2037-04                    
Secured credit facility   $ 325,000,000                    
PennantPark CLO 12, LLC | Class A-1 Loans                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 30,000,000                    
Interest rate   1.45%                    
PennantPark CLO 12, LLC | Class A-1 Notes                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 141,000,000                    
Interest rate   1.45%                    
PennantPark CLO 12, LLC | Class A-2 Notes                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 12,000,000                    
Interest rate   1.60%                    
PennantPark CLO 12, LLC | Class B Notes                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 21,000,000                    
Interest rate   1.85%                    
PennantPark CLO 12, LLC | Class C Notes                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 24,000,000                    
Interest rate   2.30%                    
PennantPark CLO 12, LLC | Class D Notes                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 18,000,000                    
Interest rate   3.30%                    
PennantPark CLO 12, LLC | Sub Notes                        
Schedule Of Investments [Line Items]                        
Debt instrument   $ 55,000,000                    
Senior Secured Revolving Credit Facility                        
Schedule Of Investments [Line Items]                        
Credit Facility payable, at fair value (cost-$298,855 and $443,855, respectively)     $ 260,000,000                  
PennantPark Senior Secured Loan Fund I LLC                        
Schedule Of Investments [Line Items]                        
Total assets       $ 1,108,373,000     $ 1,108,373,000   $ 988,122,000      
Number of portfolio companies consisted of debt investments | Portfolio       117     117   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-$298,855 and $443,855, respectively)       $ 27,000,000     $ 27,000,000   $ 146,100,000      
PennantPark Senior Secured Loan Fund I LLC | Senior Secured Revolving Credit Facility                        
Schedule Of Investments [Line Items]                        
Credit Facility payable, at fair value (cost-$298,855 and $443,855, respectively)     $ 325,000,000                  
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       21,000,000     21,000,000   21,300,000      
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments                        
Schedule Of Investments [Line Items]                        
Fair value of investment in five largest portfolio company       98,000,000     98,000,000   97,300,000      
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt                        
Schedule Of Investments [Line Items]                        
Total investments       237,700,000     237,700,000   237,700,000      
Additional unfunded investment       0     0   0      
PennantPark Senior Secured Loan Fund I LLC | Equity Interests                        
Schedule Of Investments [Line Items]                        
Total investments       $ 123,700,000     $ 123,700,000   101,900,000      
Additional unfunded investment in equity           $ (65,600,000)     $ 0