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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, 2021 | Dec. 31, 2020
Changes In Capitalized Contract Cost [Roll Forward] |  |
Beginning Balance | $ 77,836 | $ 70,396
Additional capitalized contract acquisition costs | 10,512 | 9,725
Amortization of capitalized contract acquisition costs | (9,414) | (8,152)
Ending Balance | $ 78,934 | $ 71,969

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123353750&loc=SL49131252-203054 + Details
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Period Type: | instant