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Agreements and Related Party Transactions - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Related Party Transaction [Line Items]      
Annual rate of base management fee 1.00%    
Base management fee $ 23,300 $ 14,900 $ 11,400
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 fee on unrealized and realized capital gains accrued $ 0 0 0
Incentive fees on net investment income $ 26,000 18,100 16,900
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 0
Administrative services expenses 2,800 2,161 999
Company acquired a portfolio 250,000    
Due to Affiliates 739 0  
Other Related Party      
Related Party Transaction [Line Items]      
Net investment income 0 0 0
Net realized gains (loss) on sale of investment 0 0 0
PennantPark Senior Secured Loan Fund I LLC      
Related Party Transaction [Line Items]      
Administrative services expenses 2,819 2,354  
Net investment income 379,700 253,600 158,200
Net realized gains (loss) on sale of investment 200 100 200
Due to Affiliates 700 0  
Receivable from the Administraton 300 300  
Administrator      
Related Party Transaction [Line Items]      
Administrative services expenses 2,100 1,500 $ 600
Accounts payable and accrued expenses $ 300 600  
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%