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Investments - Additional Information (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Portfolio
Mar. 31, 2024
USD ($)
Mar. 31, 2025
USD ($)
Portfolio
Mar. 31, 2024
USD ($)
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     $ 295,000 $ 339,100 $ 903,300 $ 642,500        
Sales and repayments of investments     122,400 $ 144,800 523,700 $ 248,700        
Total assets     2,471,848   $ 2,471,848   $ 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- $273,855 and $443,855, respectively)     273,790   $ 273,790   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          
PennantPark CLO 12, LLC                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 301,000                  
Issuance date 2029-04                  
Maturity date 2037-04                  
Effective percentage 100.00%                  
Secured credit facility $ 325,000                  
PennantPark CLO 12, LLC | Class A-1 Loans                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 30,000                  
Interest rate 1.45%                  
PennantPark CLO 12, LLC | Class A-1 Notes                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 141,000                  
Interest rate 1.45%                  
PennantPark CLO 12, LLC | Class A-2 Notes                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 12,000                  
Interest rate 1.60%                  
PennantPark CLO 12, LLC | Class B Notes                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 21,000                  
Interest rate 1.85%                  
PennantPark CLO 12, LLC | Class C Notes                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 24,000                  
Interest rate 2.30%                  
PennantPark CLO 12, LLC | Class D Notes                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 18,000                  
Interest rate 3.30%                  
PennantPark CLO 12, LLC | Sub Notes                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 55,000                  
Senior Secured Revolving Credit Facility                    
Schedule Of Investments [Line Items]                    
Credit Facility payable, at fair value (cost- $273,855 and $443,855, respectively)   $ 260,000                
PennantPark Senior Secured Loan Fund I LLC                    
Schedule Of Investments [Line Items]                    
Total assets     $ 1,116,139   $ 1,116,139   $ 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- $273,855 and $443,855, respectively)     $ 271,100   $ 271,100   $ 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- $273,855 and $443,855, respectively)   $ 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     98,700   98,700   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     123,700   123,700   101,900      
Additional unfunded investment in equity     $ (65,600)   $ (65,600)   $ 0