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Leases - Narrative (Details) ft² in Thousands, $ in Millions	6 Months Ended
	Mar. 31, 2024 USD ($) ft²
Lessee, Lease, Description [Line Items]
Sublease Income	$ 8.6
Sublease income payment remainder of fiscal year	2.6
Lessor, Operating Lease, Payments to be Received, Two To Three Years	$ 6.0
Office Building
Lessee, Lease, Description [Line Items]
Operating lease, number of square feet | ft²	515

X

- Definition

Lessor, Operating Lease, Payments to be Received, Two To Three Years

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	instant

X

- Definition

Operating Lease, Number of Square Feet

+ References

No definition available.

+ Details

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Namespace Prefix:	ffiv_
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

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Balance Type:	na
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X

- Definition

Amount of lease payment to be received by lessor for operating lease in remainder of current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479773/842-30-50-12

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X

- Definition

Amount of sublease income excluding finance and operating lease expense.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 53
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479589/842-20-55-53

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (e)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-4

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