v3.25.4
Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2023
Investments In And Advances To Affiliates [Line Items]      
Fair Value $ 1,287,273 [1],[2] $ 1,328,050 [3],[4],[5]  
Net Realized Gains (Losses) (52,460) (33,833) $ (151,516)
AKW Holdings Limited      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 88,646 60,798 51,660
Gross Additions   270 [6] 2,687 [7]
Gross Reductions   (3,361) 0
Net Change in Appreciation / (Depreciation)   30,939 6,451
Interest Income 6,375 3,820  
Payment-in-kind 0 2,687  
Dividend Income 27 0  
Net Realized Gains (Losses) 0 0  
Flock Financial, LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 49,314 48,839 [8] 32,300 [8]
Gross Additions   823 [6] 20,816 [7],[8]
Gross Reductions   0 (5,306) [8]
Net Change in Appreciation / (Depreciation)   (348) 1,029 [8]
Interest Income 2,182 1,341 [8]  
Payment-in-kind 823 1,397 [8]  
Dividend Income 0 0 [8]  
Net Realized Gains (Losses) (0) (5,305) [8]  
JF Intermediate, LLC (JF Holdings Corp.)      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 68,332 90,858 [9] 8,759 [9]
Gross Additions   512 [6] 51,912 [7],[9]
Gross Reductions   (49,625) (375) [9]
Net Change in Appreciation / (Depreciation)   26,587 30,562 [9]
Interest Income 4,282 5,536 [9]  
Payment-in-kind 0 0 [9]  
Dividend Income 0 0 [9]  
Net Realized Gains (Losses) 0 0 [9]  
Pragmatic Institute, LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value [10] 10,875 0  
Gross Additions [6],[10]   15,108  
Gross Reductions [10]   (108)  
Net Change in Appreciation / (Depreciation) [10]   (4,125)  
Interest Income [10] 3    
Payment-in-kind [10] 723    
Dividend Income [10] 0    
Net Realized Gains (Losses) [10] (0)    
Mailsouth Inc.      
Investments In And Advances To Affiliates [Line Items]      
Fair Value   0 0
Gross Additions [7]     0
Gross Reductions     (28,899)
Net Change in Appreciation / (Depreciation)     28,899
Interest Income   0  
Payment-in-kind   0  
Dividend Income   0  
Net Realized Gains (Losses)   28,899  
PennantPark Senior Loan Fund, LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 207,800 [11] 183,809 [11] 164,408 [12]
Gross Additions   39,323 [6],[11] 22,353 [7],[12]
Gross Reductions   0 [11] 0 [12]
Net Change in Appreciation / (Depreciation)   (15,332) [11] (2,952) [12]
Interest Income 17,207 [11] 15,041 [12]  
Payment-in-kind 0 [11] 0 [12]  
Dividend Income 20,471 [11] 21,605 [12]  
Net Realized Gains (Losses) 0 [11] 0 [12]  
RAM Energy LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value [13]   0 0
Gross Additions [7],[13]     0
Gross Reductions [13]     0
Net Change in Appreciation / (Depreciation) [13]     (0)
Interest Income [13]   0  
Payment-in-kind [13]   0  
Dividend Income [13]   0  
Net Realized Gains (Losses) [13]   795  
Cascade Environmental Holdings, LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 4,891 29,262 32,105
Gross Additions   0 [6] 0 [7]
Gross Reductions   0 0
Net Change in Appreciation / (Depreciation)   (24,371) (2,843)
Interest Income 0 0  
Payment-in-kind 0 0  
Dividend Income 0 0  
Net Realized Gains (Losses) 0 0  
Walker Edison Furniture Company LLC      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 0 [14] 4,161 [14] 13,907
Gross Additions   2,069 [6],[14] 3,012 [7]
Gross Reductions   (22,243) [14] 0
Net Change in Appreciation / (Depreciation)   16,013 [14] (12,758)
Interest Income 0 [14] 0  
Payment-in-kind 0 [14] 347  
Dividend Income 0 [14] 0  
Net Realized Gains (Losses) 21,946 [14] 0  
Controlled Affiliates      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 424,967 [2],[15],[16] 384,304 [3],[4],[5] 257,127
Gross Additions   56,036 [6] 97,768 [7]
Gross Reductions   (53,094) (34,580)
Net Change in Appreciation / (Depreciation)   37,721 63,989
Interest Income 30,049 25,738  
Payment-in-kind 1,546 4,084  
Dividend Income 20,498 21,605  
Net Realized Gains (Losses) (0) (34,999)  
Non-Controlled Affiliates      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 4,891 [2],[15],[16] 33,423 [3],[4],[5] 46,012
Gross Additions   2,069 [6] 3,012 [7]
Gross Reductions   (22,243) 0
Net Change in Appreciation / (Depreciation)   (8,358) (15,601)
Interest Income 0 0  
Payment-in-kind 0 347  
Dividend Income 0 0  
Net Realized Gains (Losses) 21,946 0  
Controlled and Non-Controlled Affiliates      
Investments In And Advances To Affiliates [Line Items]      
Fair Value 429,858 417,727 303,139
Gross Additions   58,105 [6] 100,780 [7]
Gross Reductions   (75,337) (34,580)
Net Change in Appreciation / (Depreciation)   29,363 $ 48,388
Interest Income 30,049 25,738  
Payment-in-kind 1,546 4,431  
Dividend Income 20,498 21,605  
Net Realized Gains (Losses) $ (21,946) $ (34,999)  
[1] All investments are in US Companies unless noted otherwise. Total cost, fair value, and percentage of Net Assets for the U.S. Companies were $1,181.8 million, $1,198.6 million, and 258.4%
[2] Valued based on our accounting policy (See Note 2).
[3] The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[4] The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities (See Note 6).
[5] Valued based on our accounting policy (See Note 2).
[6] Includes PIK.
[7] Includes PIK.
[8] Flock Financial, LLC became a controlled affiliate during the quarter ended June 30, 2024.
[9] JF Intermediate, LLC became a controlled affiliate during the quarter ended December 31, 2023
[10] Pragmatic Institute, LLC became a controlled affiliate during the quarter ended March 31, 2025.
[11] We and Pantheon are the members of PSLF, a joint venture formed as a Delaware limited liability company that is not consolidated by us for financial reporting purposes. The members of PSLF make investments in the PSLF in the form of subordinated debt and equity interests, and all portfolio and other material decision regarding PSLF must be submitted to PSFL’s board of directors or investment committee, both of which are comprised of two members appointed by each of us and Pantheon. Because management of PSLF is shared equally between us and Pantheon, we do not believe we control PSLF for purposes of the 1940 Act or otherwise.
[12] We and Pantheon are the members of PSLF, a joint venture formed as a Delaware limited liability company that is not consolidated by us for financial reporting purposes. The members of PSLF make investments in the PSLF in the form of subordinated debt and equity interests, and all portfolio and other material decision regarding PSLF must be submitted to PSFL’s board of directors or investment committee, both of which are comprised of two members appointed by each of us and Pantheon. Because management of PSLF is shared equally between us and Pantheon, we do not believe we control PSLF for purposes of the 1940 Act or otherwise.
[13] RAM Energy LLC was fully realized in January 2023, during the quarter ended June 30, 2024 there was realized loss due to reduction of the escrow receivable.
[14] Walker Edison Furniture Company, LLC equity investment was realized during the quarter ended September 30, 2025 and was no longer a controlled affiliate as of that date.
[15] The provisions of the 1940 Act classify investments based on the level of control that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally presumed to be “non-controlled” when we own 25% or less of the portfolio company’s voting securities and “controlled” when we own more than 25% of the portfolio company’s voting securities.
[16] The provisions of the 1940 Act classify investments further based on the level of ownership that we maintain in a particular portfolio company. As defined in the 1940 Act, a company is generally deemed as “non-affiliated” when we own less than 5% of a portfolio company’s voting securities and “affiliated” when we own 5% or more of a portfolio company’s voting securities (See Note 6).