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Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Investments In And Advances To Affiliates [Line Items]      
Fair Value $ 1,067,174 $ 1,164,254  
Net realized loss on investments (15,892) (11,106) $ (12,796)
Marketplace Events, LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 34,028 31,390  
Gross Additions   1,413  
Net Change in Unrealized Appreciation (Depreciation)   1,226  
Interest Income 4,513    
PennantPark Senior Secured Loan Fund I LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 260,969 239,615  
Gross Additions   28,438  
Net Change in Unrealized Appreciation (Depreciation)   (7,084)  
Interest Income 26,534    
Dividend/Other Income 11,463    
Controlled, Affiliated Investments      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 294,996 271,005  
Gross Additions   29,850  
Net Change in Unrealized Appreciation (Depreciation)   (5,858)  
Interest Income 31,047    
Dividend/Other Income 11,463    
Controlled and Non-Controlled Affiliates      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 294,996 271,005  
Gross Additions   29,850  
Net Change in Unrealized Appreciation (Depreciation)   $ (5,858)  
Interest Income 31,047    
Dividend/Other Income $ 11,463