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Investments - Additional Information (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
May 31, 2025
USD ($)
Apr. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Apr. 30, 2023
USD ($)
Sep. 30, 2025
USD ($)
Portfolio
Sep. 30, 2024
USD ($)
Portfolio
Sep. 30, 2023
USD ($)
Jul. 31, 2024
USD ($)
May 31, 2024
USD ($)
Jan. 31, 2021
USD ($)
Schedule Of Investments [Line Items]                    
Purchases of investments, including PIK interest         $ 1,746,600 $ 1,411,200 $ 325,800      
Sales and repayments of investments         925,700 514,100 $ 399,100      
Total assets         $ 2,913,681 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-$443,885 and $9,400, respectively)         $ 683,837 443,880        
Credit facility interest rate description     SOFR plus 225              
Debt securitization       $ 297,800         $ 300,700 $ 300,700
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.          
2031 Asset-Backed Debt                    
Schedule Of Investments [Line Items]                    
Debt securitization               $ 351,000    
Pennant Park C L O V I L L C                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 315,800                  
Pennant Park C L O V I L L C | Class Loans A-R [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 228,000                  
Percentage points added to reference rate 1.85%                  
Pennant Park C L O V I L L C | Class Loans B-R [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 18,000                  
Percentage points added to reference rate 4.50%                  
Pennant Park C L O V I L L C | Class Loans C-R [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 18,000                  
Pennant Park C L O V I L L C | Sub Notes [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument $ 51,800                  
PennantPark CLO 12 LLC                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 301,000                
Instrument Issuance Date   2029-04                
Maturity date   2037-04                
PennantPark CLO 12 LLC | Sub Notes [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 55,000                
PennantPark CLO 12 LLC | Class A-1 Loans [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 30,000                
Percentage points added to reference rate   1.45%                
PennantPark CLO 12 LLC | Class A-1 Notes [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 141,000                
Percentage points added to reference rate   1.45%                
PennantPark CLO 12 LLC | Class A-2 Notes [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 12,000                
Percentage points added to reference rate   1.60%                
PennantPark CLO 12 LLC | Class B Notes [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 21,000                
Percentage points added to reference rate   1.85%                
PennantPark CLO 12 LLC | Class C Notes [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 24,000                
Percentage points added to reference rate   2.30%                
PennantPark CLO 12 LLC | Class D Notes [Member]                    
Schedule Of Investments [Line Items]                    
Debt instrument   $ 18,000                
Percentage points added to reference rate   3.30%                
Senior Secured Revolving Credit Facility                    
Schedule Of Investments [Line Items]                    
Credit Facility payable, at fair value (cost-$443,885 and $9,400, respectively)     $ 260,000              
PennantPark Senior Secured Loan Fund I LLC                    
Schedule Of Investments [Line Items]                    
Total assets         $ 1,153,689 $ 988,122        
Number of Portfolio Companies Consisted of Debt Investments | Portfolio         117 109        
Percentage of capital ownership in each of outstanding subordinated notes and equity interests         87.50% 12.50%        
Total investments         $ 200,000          
Secured notes investment         105,000          
Investment membership interest         45,000          
Credit Facility payable, at fair value (cost-$443,885 and $9,400, respectively)         74,500 $ 146,100        
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 Senior Secured Loan Fund I LLC | Senior Secured Revolving Credit Facility                    
Schedule Of Investments [Line Items]                    
Credit Facility payable, at fair value (cost-$443,885 and $9,400, 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         20,900 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         99,300 97,300        
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt                    
Schedule Of Investments [Line Items]                    
Total investments         237,700 237,700        
Additional unfunded investment         0 0        
PennantPark Senior Secured Loan Fund I LLC | Equity Interests                    
Schedule Of Investments [Line Items]                    
Total investments         123,700 101,900        
Additional unfunded investment in equity         65,600 $ 0        
PennantPark Floating Rate Capital                    
Schedule Of Investments [Line Items]                    
Total investments         150,000          
Hamilton Lane (HL)                    
Schedule Of Investments [Line Items]                    
Total investments         50,000          
Secured notes investment         35,000          
Investment membership interest         $ 15,000