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Commitments And Contingencies (Details) | 3 Months Ended
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Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract] |
Product warranty period | 1 year

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- Definition Product Warranty Period + References No definition available. + Details
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Namespace Prefix: | ffiv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration