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Revenue from Contracts with Customers - Capitalized contract acquisition costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Changes In Capitalized Contract Cost [Roll Forward]
Beginning Balance			$ 66,258	$ 66,468
Additional capitalized contract acquisition costs			21,529	13,851
Amortization of capitalized contract acquisition costs	$ (9,600)	$ (8,900)	(18,676)	(18,015)
Ending Balance	$ 69,111	$ 62,304	$ 69,111	$ 62,304

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
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479483/340-40-50-3

+ 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
-Topic 340
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479483/340-40-50-3

+ Details

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Balance Type:	debit
Period Type:	instant