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Cover Page - USD ($)
 12 Months Ended
Sep. 30, 2022
Nov. 07, 2022
Mar. 31, 2022
Cover [Abstract]      
Entity Central Index Key 0001048695    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Sep. 30, 2022    
Document Transition Report false    
Entity File Number 000-26041    
Entity Registrant Name F5, Inc.    
Entity Incorporation, State or Country Code WA    
Entity Tax Identification Number 91-1714307    
Entity Address, Address Line One 801 5th Avenue    
Entity Address, City or Town Seattle    
Entity Address, State or Province WA    
Entity Address, Postal Zip Code 98104    
City Area Code 206    
Local Phone Number 272-5555    
Title of 12(b) Security Common stock, no par value    
Trading Symbol FFIV    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 12,578,190,940
Entity Common Stock, Shares Outstanding   60,368,610  
Documents Incorporated by Reference [Text Block] Information required in response to Part III of this Form 10-K (Items 10, 11, 12, 13 and 14) is hereby incorporated by reference to the specified portions of the Registrant’s Definitive Proxy Statement for the Annual Shareholders Meeting for fiscal year 2022, which Definitive Proxy Statement shall be filed with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days of the end of the fiscal year to which this Report relates    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --09-30    
Amendment Flag false