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Agreements and Related Party Transactions - Additional Information (Details) - USD ($)
 3 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Sep. 30, 2023
Related Party Transaction [Line Items]      
Annual rate of base management fee 1.00%    
Base management fee $ 3,000,000 $ 2,900,000  
Base management fee calculation description The base management fee is calculated based on the average adjusted gross assets at the end of the two most recently completed calendar quarters, and appropriately adjusted for any share issuances or repurchases during the current calendar quarter.    
Incentive fee quarter hurdle rate 1.75%    
Incentive fee annual hurdle rate 7.00%    
Incentive fees on net investment income $ 4,900,000 3,400,000  
Description of incentive fee on net investment income We pay the Investment Adviser an incentive fee with respect to our Pre-Incentive Fee Net Investment Income in each calendar quarter as follows: (1) no incentive fee in any calendar quarter in which our Pre-Incentive Fee Net Investment Income does not exceed the hurdle rate of 1.75%, (2) 50% of our Pre-Incentive Fee Net Investment Income with respect to that portion of such Pre-Incentive Fee Net Investment Income, if any, that exceeds the hurdle rate but is less than 2.9167% in any calendar quarter (11.67% annualized) (we refer to this portion of our Pre-Incentive Fee Net Investment Income (which exceeds the hurdle but is less than 2.9167%) as the “catch-up,” which is meant to provide our Investment Adviser with 20% of our Pre-Incentive Fee Net Investment Income, as if a hurdle did not apply, if this net investment income exceeds 2.9167% in any calendar quarter), and (3) 20% of the amount of our Pre-Incentive Fee Net Investment Income, if any, that exceeds 2.9167% in any calendar quarter.    
Incentive fee on capital gains percentage 20.00%    
Incentive fee on capital gains accrued $ 0 0  
Incentive fee on unrealized and realized capital gains accrued 0 0  
Administration fees 988,000 706,000  
Net investment income 19,449,000 13,732,000  
Due to affiliates 492,000   $ 566,000
Other Related Party      
Related Party Transaction [Line Items]      
Gain on Sale of Investments 0 0  
Net investment income 0 0  
PennantPark Senior Secured Loan Fund I LLC      
Related Party Transaction [Line Items]      
Administration fees [1] 558,000 508,000  
Net investment income 62,700,000 18,800,000  
Due to affiliates 500,000   600,000
Receivable from the Administraton 100,000   $ 100,000
Administrator      
Related Party Transaction [Line Items]      
Administration fees 600,000 $ 100,000  
Incentive Fee Payment Condition One      
Related Party Transaction [Line Items]      
Incentive fees on net investment income $ 0    
Incentive Fee Payment Condition One | Maximum      
Related Party Transaction [Line Items]      
Incentive fee quarter hurdle rate 1.75%    
Incentive Fee Payment Condition Two      
Related Party Transaction [Line Items]      
Pre-incentive fee net investment income percentage 50.00%    
Incentive Fee Payment Condition Two | Maximum      
Related Party Transaction [Line Items]      
Incentive fee quarter hurdle rate 2.9167%    
Incentive fee annual hurdle rate 11.67%    
Incentive Fee Payment Condition Two | Minimum      
Related Party Transaction [Line Items]      
Incentive fee quarter hurdle rate 2.9167%    
Pre-incentive fee net investment income percentage 20.00%    
Incentive Fee Payment Condition Three      
Related Party Transaction [Line Items]      
Pre-incentive fee net investment income percentage 20.00%    
Incentive Fee Payment Condition Three | Minimum      
Related Party Transaction [Line Items]      
Incentive fee quarter hurdle rate 2.9167%    
[1] No management or incentive fees are payable by PSSL. If any fees were to be charged, they would be separately disclosed in the consolidated statement of operations.