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Investments - Additional Information (Details) - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
May 31, 2022
Jun. 30, 2022
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2020
Apr. 30, 2022
Jan. 31, 2021
Schedule Of Investments [Line Items]              
Purchases of investments, including PIK interest     $ 609,200 $ 664,100 $ 439,200    
Sales and repayments of investments     495,200 702,100 $ 396,900    
Total assets     1,223,866 1,170,856      
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     $ 167,563 218,851      
Credit facility interest rate description SOFR plus 260 basis points            
Debt securitization             $ 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]              
Line of credit $ 325,000         $ 225,000  
PennantPark Senior Secured Loan Fund I LLC              
Schedule Of Investments [Line Items]              
Total assets     $ 796,811 $ 603,559      
Percentage of capital ownership in each of outstanding subordinated notes and equity interests     87.50% 12.50%      
Line of credit     $ 259,500 $ 112,000      
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     19,300 18,900      
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 84,300      
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt              
Schedule Of Investments [Line Items]              
Total investments     190,200 140,900      
Additional unfunded investment     19,900 29,400      
PennantPark Senior Secured Loan Fund I LLC | Equity Interests              
Schedule Of Investments [Line Items]              
Total investments     81,500 60,400      
Additional unfunded investment in equity     $ 8,500 $ 12,600