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Agreements and Related Party Transactions - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Related Party Transaction [Line Items]        
Annual rate of base management fee     1.00%  
Base management fee $ 2,900,000 $ 2,900,000 $ 5,800,000 $ 5,800,000
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 4,200,000 2,700,000 $ 7,600,000 5,900,000
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
Administrative services expenses (See Note 3) 705,000 655,000 $ 1,410,000 1,309,000
Other Related Party        
Related Party Transaction [Line Items]        
Net investment income 0     0
Net realised loss on sale of investment   (200,000)   (500,000)
PennantPark Senior Secured Loan Fund I LLC        
Related Party Transaction [Line Items]        
Administrative services expenses (See Note 3) 516,000 300,000 1,024,000 600,000
Net investment income 27,100,000 57,700,000 45,900,000 180,400,000
Administrator        
Related Party Transaction [Line Items]        
Administrative services expenses (See Note 3) 200,000 $ 400,000 300,000 $ 900,000
Maximum | Other Related Party        
Related Party Transaction [Line Items]        
Net realised loss on sale of investment $ (100,000)   (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%