Unconsolidated Significant Subsidiaries	12 Months Ended
Sep. 30, 2025
Investments in and Advances to Affiliates [Abstract]
Unconsolidated Significant Subsidiaries	13. UNCONSOLIDATED SIGNIFICANT SUBSIDIARIES We must determine which, if any, of our unconsolidated controlled portfolio companies is a "significant subsidiary" within the meaning of Regulation S-X. We have determined that, as of September 30, 2025, PennantPark Senior Secured Loan Fund I LLC triggered at least one of the significance tests. Because none of the significance tests under Rule 3-09 of Regulation S-X were triggered by PennantPark Senior Secured Loan Fund I LLC, separate audited financial statements of PennantPark Senior Secured Loan Fund I LLC are not required (and instead only summarized financial information is required pursuant to Rule 4-08(g) of Regulation S-X) but nonetheless, separate audited financial statements of PennantPark Senior Secured Loan Fund I LLC for the years ended September 30, 2025, 2024, and 2023 are also being filed voluntarily herewith as Exhibit 99.3 and Exhibit 99.4 to assist investors with better understanding the financial position of PennantPark Senior Secured Loan Fund I LLC.

Unconsolidated Significant Subsidiaries

12 Months Ended

Sep. 30, 2025

Investments in and Advances to Affiliates [Abstract]

13. UNCONSOLIDATED SIGNIFICANT SUBSIDIARIES

We must determine which, if any, of our unconsolidated controlled portfolio companies is a "significant subsidiary" within the meaning of Regulation S-X. We have determined that, as of September 30, 2025, PennantPark Senior Secured Loan Fund I LLC triggered at least one of the significance tests. Because none of the significance tests under Rule 3-09 of Regulation S-X were triggered by PennantPark Senior Secured Loan Fund I LLC, separate audited financial statements of PennantPark Senior Secured Loan Fund I LLC are not required (and instead only summarized financial information is required pursuant to Rule 4-08(g) of Regulation S-X) but nonetheless, separate audited financial statements of PennantPark Senior Secured Loan Fund I LLC for the years ended September 30, 2025, 2024, and 2023 are also being filed voluntarily herewith as Exhibit 99.3 and Exhibit 99.4 to assist investors with better understanding the financial position of PennantPark Senior Secured Loan Fund I LLC.