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Revenue from Contracts with Customers - Capitalized contract acquisition costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Changes In Capitalized Contract Cost [Roll Forward]
Beginning Balance	$ 77,220	$ 77,836
Additional capitalized contract acquisition costs	6,267	10,512
Amortization of capitalized contract acquisition costs	(9,687)	(9,414)
Ending Balance	$ 73,800	$ 78,934

X

- Definition

Capitalized Contract Cost, Deferred Acquisition Costs

+ References

No definition available.

+ Details

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Namespace Prefix:	ffiv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Changes In Capitalized Contract Cost [Roll Forward]

+ References

No definition available.

+ Details

Name:	ffiv_ChangesInCapitalizedContractCostRollForward
Namespace Prefix:	ffiv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054

+ Details

Name:	us-gaap_CapitalizedContractCostAmortization
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126905575&loc=SL49131252-203054

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant