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N-2 - $ / shares | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2024 | Sep. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022
Cover [Abstract] |  |  |  |
Entity Central Index Key | 0001504619 |  |  |
Amendment Flag | false |  |  |
Securities Act File Number | 814-00891 |  |  |
Document Type | 10-Q |  |  |
Entity Registrant Name | PENNANTPARK FLOATING RATE CAPITAL LTD. |  |  |
Entity Address, Address Line One | 1691 Michigan Avenue |  |  |
Entity Address, City or Town | Miami Beach |  |  |
Entity Address, State or Province | FL |  |  |
Entity Address, Postal Zip Code | 33139 |  |  |
City Area Code | 786 |  |  |
Local Phone Number | 297-9500 |  |  |
Entity Emerging Growth Company | false |  |  |
General Description of Registrant [Abstract] |  |  |  |
Risk Factors [Table Text Block] | Item 1A. R isk Factors In addition to the other information set forth in this Report, you should consider carefully the factors discussed below, as well as in Part I “Item 1A. Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended September 30, 2023 filed on December 8, 2023, which could materially affect our business, financial condition and/or operating results. The risks described as in our Annual Report on Form 10-K are not the only risks facing PennantPark Floating Rate Capital Ltd. Additional risks and uncertainties not currently known to us or that we currently deem to be immaterial also may materially and adversely affect our business, financial condition and/or operating results. |  |  |
NAV Per Share | $ 11.4 | $ 11.13 | $ 11.15 | $ 11.62

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