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Investments - Additional Information (Details)
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Portfolio
Mar. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Portfolio
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Portfolio
Apr. 30, 2023
USD ($)
Jan. 31, 2021
USD ($)
Schedule Of Investments [Line Items]                
Purchases of investments, including PIK interest   $ 339,100,000 $ 85,600,000 $ 642,500,000 $ 151,200,000      
Sales and repayments of investments   144,800,000 $ 62,600,000 248,700,000 $ 125,600,000      
Total assets   1,615,840,000   $ 1,615,840,000   $ 1,179,611,000    
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.        
Line of credit   168,878,000   $ 168,878,000   9,400,000    
Credit facility interest rate description SOFR plus 260 basis points              
Debt securitization             $ 297,800,000 $ 300,700,000
SOFR                
Schedule Of Investments [Line Items]                
Percentage points added to reference rate 260.00%              
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.        
Senior Secured Revolving Credit Facility                
Schedule Of Investments [Line Items]                
Line of credit $ 325,000,000              
PennantPark Senior Secured Loan Fund I LLC                
Schedule Of Investments [Line Items]                
Total assets   $ 940,966,000   $ 940,966,000   $ 869,410,000    
Number of portfolio companies consisted of debt investments | Portfolio   106   106   105    
Percentage of capital ownership in each of outstanding subordinated notes and equity interests       87.50%   12.50%    
Line of credit   $ 135,600,000   $ 135,600,000   $ 48,600,000    
PennantPark Senior Secured Loan Fund I LLC | Senior Secured Revolving Credit Facility                
Schedule Of Investments [Line Items]                
Line of credit $ 260,000,000              
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   21,400,000   21,400,000   18,500,000    
PennantPark Senior Secured Loan Fund I LLC | Five Largest Investments                
Schedule Of Investments [Line Items]                
Fair value of investment in five largest portfolio company   95,600   95,600   83,400,000    
PennantPark Senior Secured Loan Fund I LLC | First Lien Secured Debt                
Schedule Of Investments [Line Items]                
Total investments   210,100,000   210,100,000   210,100,000    
Additional unfunded investment   27,600,000   27,600,000   27,600,000    
PennantPark Senior Secured Loan Fund I LLC | Equity Interests                
Schedule Of Investments [Line Items]                
Total investments   90,000,000   90,000,000   90,000,000    
Additional unfunded investment   $ 11,800,000   $ 11,800,000        
Additional unfunded investment in equity           $ 11,800,000