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Transactions with Affiliated Companies - Summary of Transactions with Affiliated Companies (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Investments In And Advances To Affiliates [Line Items] |  |  |  |  |  |
Fair Value | $ 1,983,504 |  | $ 1,067,174 |  |  |
Net realized loss on investments | 222 |  | (15,892) |  | $ (11,106) |
Marketplace Events, LLC |  |  |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |  |  |
Fair Value | 57,107 |  | 34,027 |  |  |
Gross Additions | 8,258 |  |  |  |  |
Net Change in Unrealized Appreciation (Depreciation) | 14,822 |  |  |  |  |
Interest Income | 5,180 |  |  |  |  |
Dividend/Other Income | 130 |  |  |  |  |
PennantPark Senior Secured Loan Fund I LLC |  |  |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |  |  |
Fair Value | 294,128 | [1] | 260,969 | [1],[2] | 239,615 | [2]
Gross Additions | 39,375 | [1] | 28,438 | [2] |  |
Net Change in Unrealized Appreciation (Depreciation) | (6,216) | [1] | (7,084) | [2] |  |
Interest Income | 29,913 | [1] | 26,534 | [2] |  |
Dividend/Other Income | 14,875 | [1] | 11,463 | [2] |  |
Controlled, Affiliated Investments |  |  |  |  |  |
Investments In And Advances To Affiliates [Line Items] |  |  |  |  |  |
Fair Value | 351,235 |  | 294,996 |  | 271,005 |
Gross Additions | 47,633 |  | 29,850 |  |  |
Net Change in Unrealized Appreciation (Depreciation) | 8,606 |  | (5,858) |  |  |
Interest Income | 35,093 |  | 31,047 |  |  |
Dividend/Other Income | $ 15,005 |  | 11,463 |  |  |
Controlled, Affiliated Investments | 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 |  |  |
Dividend/Other Income |  |  | $ 0 |  |  |
[1] | 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 the 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.
[2] | * 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 the 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

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