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Agreements and Related Party Transactions - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Jun. 30, 2025
Sep. 30, 2025
Related Party Transaction [Line Items]        
Annual rate of base management fee 1.00%      
Base management fee $ 6,800 $ 5,300    
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 $ 6,700 7,500    
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 1,200 1,200    
Total Payable 0     $ 700
Other Related Party        
Related Party Transaction [Line Items]        
Net investment income 0 0    
PennantPark Senior Secured Loan Fund I LLC        
Related Party Transaction [Line Items]        
Gain on Sale of Investments (300) (100)    
Administration fees [1] 758 668    
Net investment income 132,500 187,700    
Receivable from the Administraton 200     300
Total Payable 271,600     $ 271,600
PennantPark Senior Secured Loan Fund II LLC        
Related Party Transaction [Line Items]        
Net investment income 196,500 0    
Administrator        
Related Party Transaction [Line Items]        
Administration fees $ 700 $ 400    
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. PSSL pays the Administrator an annual fee of 0.25% of average gross assets under management on a quarterly basis.