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Investments - Additional Information (Details)
$ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2023
USD ($)
Apr. 30, 2023
USD ($)
Sep. 30, 2023
USD ($)
Portfolio
Sep. 30, 2022
USD ($)
Portfolio
Sep. 30, 2021
USD ($)
Jul. 31, 2023
USD ($)
Jan. 31, 2021
USD ($)
Schedule Of Investments [Line Items]              
Purchases of investments, including PIK interest     $ 325,800 $ 609,200 $ 664,100    
Sales and repayments of investments     399,100 495,200 $ 702,100    
Total assets     $ 1,179,611 1,227,474      
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-$9,400 and $168,830, respectively) (See Notes 5 and 11)     $ 9,400 167,563      
Credit facility interest rate description 260            
Debt securitization   $ 297,800         $ 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.        
Senior Secured Revolving Credit Facility              
Schedule Of Investments [Line Items]              
Credit Facility payable, at fair value (cost-$9,400 and $168,830, respectively) (See Notes 5 and 11) $ 260,000         $ 325,000  
PennantPark Senior Secured Loan Fund I LLC              
Schedule Of Investments [Line Items]              
Total assets     $ 869,410 $ 796,811      
Number of Portfolio Companies Consisted of Debt Investments | Portfolio     105 95      
Percentage of capital ownership in each of outstanding subordinated notes and equity interests     87.50% 12.50%      
Credit Facility payable, at fair value (cost-$9,400 and $168,830, respectively) (See Notes 5 and 11)     $ 48,600 $ 259,500      
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 | Investment In Single Portfolio Company              
Schedule Of Investments [Line Items]              
Fair value of largest investment in a single portfolio company     19,300        
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments              
Schedule Of Investments [Line Items]              
Fair value of investment in five largest portfolio company     86,900        
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt              
Schedule Of Investments [Line Items]              
Total investments     210,100 190,200      
Additional unfunded investment     27,600 19,900      
PennantPark Senior Secured Loan Fund I LLC | Equity Interests              
Schedule Of Investments [Line Items]              
Total investments     90,000 81,500      
Additional unfunded investment in equity     $ 11,800 $ 8,500