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Document and Entity Information - shares
 9 Months Ended
Jun. 30, 2024
Aug. 07, 2024
Cover [Abstract]    
Document Type 10-Q  
Document Quarterly Report true  
Current Fiscal Year End Date --09-30  
Document Period End Date Jun. 30, 2024  
Document Transition Report false  
Entity File Number 814-00891  
Entity Registrant Name PENNANTPARK FLOATING RATE CAPITAL LTD.  
Entity Incorporation, State or Country Code MD  
Entity Tax Identification Number 27-3794690  
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  
Title of 12(b) Security Common Stock, par value $0.001 per share  
Trading Symbol PFLT  
Security Exchange Name NYSE  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   73,420,712
Entity Central Index Key 0001504619  
Amendment Flag false  
Document Fiscal Year Focus 2024  
Document Fiscal Period Focus Q3