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Commitments And Contingencies (Details)	6 Months Ended
	Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Product warranty period	1 year

X

- Definition

Product Warranty Period

+ References

No definition available.

+ Details

Name:	ffiv_ProductWarrantyPeriod
Namespace Prefix:	ffiv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration