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Revenue from Contracts with Customers - Capitalized contract acquisition costs (Details) - USD ($) $ in Thousands | 3 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Changes In Capitalized Contract Cost [Roll Forward] |  |
Beginning Balance | $ 66,258 | $ 66,468
Additional capitalized contract acquisition costs | 13,223 | 7,287
Amortization of capitalized contract acquisition costs | (9,134) | (9,114)
Ending Balance | $ 70,347 | $ 64,641

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- 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

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- Definition Changes In Capitalized Contract Cost [Roll Forward] + References No definition available. + Details
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Namespace Prefix: | ffiv_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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