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Organization - Additional Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 12 Months Ended 18 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, 2025
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2021
Sep. 30, 2025
Feb. 28, 2025
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                 $ 683,837 $ 443,880     $ 683,837              
Deferred Offering Costs                 1,500       1,500              
Company acquired portfolio                 250,000       250,000              
Net realized (gain) loss                 $ (5,941) $ 222 $ (15,892)                  
Common stock shares issued                 21,638,000 18,845,194 13,389,064                  
Debt securitization                             $ 300,700 $ 297,800     $ 300,700  
Retained debt securitization         $ 85,000                              
Common stock issued issued                 $ 245,479 $ 213,910 $ 148,408                  
At The Market Offering                                        
Debt Instrument [Line Items]                                        
ATM Program terminated         250,000                              
Proceeds from Issuance of Common Stock                 $ 244,800 $ 213,300     $ 557,600              
Common stock shares issued                 21,638,000 18,845,194     49,486,081              
Weighted average price per share of common stock issued                 $ 11.34 $ 11.35     $ 11.27              
Proceeds from issuance of common stock                 $ 244,800 $ 213,300     $ 557,600              
Common stock issued issued                 192,200 437,300                    
Legal and other offering costs         $ 500,000       $ 300 $ 800     $ 300              
2026 Notes Payable                                        
Debt Instrument [Line Items]                                        
2035 Asset-backed debt net (par-$246,000)                                 $ 85,000 $ 100,000    
Percentage of public offering price per notes issued                                 101.50% 99.40%    
Debt instrument, interest rate                 4.25%                      
Effective percentage                 4.15%       4.15%              
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                            
Sale of investments to wholly owned subsidiary in cash           69,500                            
Sale of investments to wholly owned subsidiary in equity interest           $ 11,900                            
Percentage of outstanding class A units           23.08%           23.08%                
Net realized (gain) loss           $ 400                            
Capital commitment                       $ 15,300                
Voting interest in general partnership                       4.99%                
2023 Notes                                        
Debt Instrument [Line Items]                                        
2035 Asset-backed debt net (par-$246,000)                                       $ 138,600
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 basis points                 200.00%                      
SOFR | Funding I                                        
Debt Instrument [Line Items]                                        
Credit Facility payable                 $ 718,000       $ 718,000              
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%                        
2037 Asset-Backed Debt                                        
Debt Instrument [Line Items]                                        
Debt securitization                           $ 474,600            
2037 Debt Securitization                                        
Debt Instrument [Line Items]                                        
Retained debt securitization                           85,100            
2037 Debt Securitization | Class D Notes [Member]                                        
Debt Instrument [Line Items]                                        
Retained debt securitization                           $ 28,500            
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%