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Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments In And Advances To Affiliates [Line Items]        
Fair Value $ 2,605,347 [1],[2],[3],[4],[5]   $ 2,773,328 [6],[7],[8],[9],[10]  
Net Change in Unrealized Appreciation (Depreciation) (32,287) $ (28,961)    
Net Realized Gains (Losses) 1,457 26,674    
Net Realized Gains (Losses) 1,457 26,674    
Marketplace Events, LLC        
Investments In And Advances To Affiliates [Line Items]        
Fair Value [11]   0   $ 57,107
Gross Additions [11]   4,214    
Investments in and Advances to Affiliates, at Fair Value, Gross Reductions [11]   62,477    
Gross Reductions [11]   (62,477)    
Net Change in Unrealized Appreciation (Depreciation) [11]   24,337    
Interest Income [11]   5,062    
Dividend/Other Income [11]   306    
Net Realized Gains (Losses) [11]   25,493    
PennantPark Senior Secured Loan Fund I LLC        
Investments In And Advances To Affiliates [Line Items]        
Fair Value 310,340 [12] 286,561 [13] 281,968 [12] 294,128 [13]
Gross Additions [12] 39,375      
Investments in and Advances to Affiliates, at Fair Value, Gross Reductions 0 [12] 0 [13]    
Gross Reductions 0 [12] 0 [13]    
Net Change in Unrealized Appreciation (Depreciation) (11,003) [12] (7,567) [13]    
Interest Income 7,273 [12] 7,746 [13]    
Dividend/Other Income 4,944 [12] 4,375 [13]    
Net Realized Gains (Losses) 0 [12] 0 [13]    
PennantPark Senior Secured Loan Fund II LLC        
Investments In And Advances To Affiliates [Line Items]        
Fair Value [14] 56,232   0  
Gross Additions [14] 56,250      
Investments in and Advances to Affiliates, at Fair Value, Gross Reductions [14] 0      
Gross Reductions [14] 0      
Net Change in Unrealized Appreciation (Depreciation) [14] (18)      
Interest Income [14] 572      
Dividend/Other Income [14] 0      
Net Realized Gains (Losses) [14] 0      
Controlled Affiliated Investments [Member]        
Investments In And Advances To Affiliates [Line Items]        
Fair Value 366,572 286,561 $ 281,968 $ 351,235
Gross Additions 95,625 4,214    
Investments in and Advances to Affiliates, at Fair Value, Gross Reductions 0 62,477    
Gross Reductions 0 (62,477)    
Net Change in Unrealized Appreciation (Depreciation) (11,021) 31,904    
Interest Income 7,845 12,808    
Dividend/Other Income 4,944 4,681    
Net Realized Gains (Losses) $ 0 $ 25,493    
[1] All of our investments are not registered under the 1933 Act and have restrictions on resale.
[2] As of December 31, 2025, all investments were in U.S. companies and total cost, fair value, and percentage of Net Assets for the U.S companies were $2,683.7 million, $2,605.3 million, and 250.4%
[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.
[5] Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).
[6] All of our investments are not registered under the 1933 Act and have restrictions on resale.
[7] As of September 30, 2025, all investments were in U.S companies and total cost, fair value, and percentage of Net Assets for the U.S. companies were $2,819.4 million, $2,773.3 million, and 258.1%
[8] 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.
[9] 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.
[10] Valued based on our accounting policy (See Note 2). The value of all securities was determined using significant unobservable inputs (See Note 5).
[11] Marketplace was sold during the Q1 2025 quarter.
[12] We and Kemper are the members of PSSL, a joint venture formed as a Delaware limited liability company that is not consolidated by us for financial reporting purposes. The members of PSSL make investments in PSSL in the form of first lien secured debt and equity interests, and all portfolio and other material decisions regarding PSSL must be submitted to PSSL’s board of directors or investment committee, both of which are comprised of two members appointed by each of us and Kemper. Because management of PSSL is shared equally between us and Kemper, we do not believe we control PSSL for purposes of the 1940 Act or otherwise
[13] We and Kemper are the members of PSSL, a joint venture formed as a Delaware limited liability company that is not consolidated by us for financial reporting purposes. The members of PSSL make investments in PSSL in the form of first lien secured debt and equity interests, and all portfolio and other material decisions regarding PSSL must be submitted to PSSL’s board of directors or investment committee, both of which are comprised of two members appointed by each of us and Kemper. Because management of PSSL is shared equally between us and Kemper, we do not believe we control PSSL for purposes of the 1940 Act or otherwise.
[14] We and HL are the members of PSSL II, a joint venture formed as a Delaware limited liability company that is not consolidated by us for financial reporting purposes. The members of PSSL II make investments in PSSL II in the form of first lien secured debt and equity interests, and all portfolio and other material decisions regarding PSSL II must be submitted to PSSL II’s board of directors or investment committee, both of which are comprised of equal number of representatives from each the Company and HL. Because management of PSSL II is shared equally between us and HL, we do not believe we control PSSL II for purposes of the 1940 Act or otherwise.