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Organization - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended 156 Months Ended 168 Months Ended
Dec. 15, 2023
Dec. 15, 2022
Dec. 15, 2021
Dec. 15, 2020
Jul. 31, 2024
Apr. 30, 2021
Mar. 31, 2020
Sep. 30, 2019
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2023
Sep. 30, 2024
May 31, 2024
Apr. 30, 2023
Oct. 31, 2021
Mar. 31, 2021
Jan. 31, 2021
Nov. 30, 2017
Debt Instrument [Line Items]                                        
Percentage of managed assets invested                 80.00%                      
Credit Facility payable                 $ 443,880,000 $ 9,400,000     $ 9,400,000 $ 443,880,000            
Deferred Offering Costs                   1,200,000     $ 1,200,000              
Net realized (gain) loss                 $ 222,000 $ (15,892,000) $ (11,106,000)                  
Common stock shares issued                 18,845,194 13,389,064 6,464,910                  
Debt securitization                             $ 300,700,000 $ 297,800,000     $ 300,700,000  
Retained debt securitization         $ 85,000,000                              
Common stock issued issued                 $ 213,910,000 $ 148,408,000 $ 81,936,000                  
At The Market Offering                                        
Debt Instrument [Line Items]                                        
ATM Program terminated         250,000,000                              
Proceeds from Issuance of Common Stock                 $ 213,300,000 $ 100,200,000       $ 312,500            
Common stock shares issued                 1,884,519 9,089,064     27,848,081              
Weighted average price per share of common stock issued                 $ 11.35 $ 11.03       $ 11.22            
Proceeds from issuance of common stock                 $ 213,300,000 $ 100,200,000       $ 312,500            
Common stock issued issued                 437,300,000 154,100,000                    
Legal and other offering costs         $ 500,000,000       $ 800,000 $ 500,000     $ 500,000 800,000            
2026 Notes Payable                                        
Debt Instrument [Line Items]                                        
2035 Asset-backed debt net (par-$246,000)                                 $ 85,000,000 $ 100,000,000    
Percentage of public offering price per notes issued                                 101.50% 99.40%    
Debt instrument, interest rate                 4.25%                      
Debt instrument, maturity date                 Apr. 01, 2026                      
Debt instrument, periodic payment                 semi-annually                      
PennantPark-TSO Senior Loan Fund, LP                                        
Debt Instrument [Line Items]                                        
Sale of investments to wholly owned subsidiary           $ 81,400,000                            
Sale of investments to wholly owned subsidiary in cash           69,500,000                            
Sale of investments to wholly owned subsidiary in equity interest           $ 11,900,000                            
Percentage of outstanding class A units           23.08%           23.08%                
Net realized (gain) loss           $ 400,000                            
Capital commitment                       $ 15,300,000                
Voting interest in general partnership                       4.99%                
2023 Notes                                        
Debt Instrument [Line Items]                                        
2035 Asset-backed debt net (par-$246,000)                                       $ 138,600,000
Debt instrument, interest rate             4.30%                          
Debt instrument, periodic payment                 four annual installments four annual installments                    
Percentage of original principal amount payable 55.00% 15.00% 15.00% 15.00%                                
SOFR                                        
Debt Instrument [Line Items]                                        
Credit Facility payable                 $ 636,000,000         $ 636,000,000            
Credit facility basis points                 225.00%                      
2031 Asset-Backed Debt                                        
Debt Instrument [Line Items]                                        
Percentage of preferred shares of securitization issuer               100.00%                        
2031 Asset-Backed Debt | Class D Secured Deferrable Floating Rate Notes                                        
Debt Instrument [Line Items]                                        
Percentage of notes issued by securitization issuer               100.00%                        
First Lien Secured Debt | Minimum                                        
Debt Instrument [Line Items]                                        
Percentage of overall portfolio                 65.00%                      
Second Lien Secured Debt | Maximum                                        
Debt Instrument [Line Items]                                        
Percentage of overall portfolio                 35.00%