XML 57 R39.htm IDEA: XBRL DOCUMENT
v3.23.3

Summary Of Significant Accounting Policies - Narrative (Details) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2023 USD ($) segment | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($)
Segment Reporting [Abstract] |  |  |
Number of Reportable Segments | segment | 1 |  |
Advertising |  |  |
Advertising Expense | $ | $ 8.9 | $ 15.4 | $ 10.0
Restricted Stock Units (RSUs) [Member] |  |  |
Restricted Stock Award |  |  |
Award vesting period | 2 years | 2 years | 2 years
Restricted Stock Units (RSUs) [Member] | Annual Equity Program [Member] |  |  |
Restricted Stock Award |  |  |
Percentage Of Annual Performance Stock Grant Based On Achieving Annual Revenue Goal | 50.00% |  |
Percentage Of Annual Performance Stock Grant Based On Achieving Annual Increase in Stand-alone Software Goal |  | 25.00% |
Percentage Of Annual Performance Stock Grant Based On Achieving Earnings Per Share Goal | 25.00% |  |
Percentage Of Annual Performance Stock Grant Based On Achieving Relative Total Shareholder Return Benchmarked to the S&P 500 Index Goal | 25.00% |  |
Percentage Of Over-Achievement To Which Annual Performance Based Vesting Cannot Exceed | 200.00% |  |
Maintenance [Member] |  |  |
Revenue Recognition |  |  |
Capitalized Contract Cost, Amortization Period | 4 years 6 months |  |
Hardware [Member] |  |  |
Guarantees and Product Warranties |  |  |
Standard Product Warranty Description | one year |  |
Minimum |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property and equipment, useful life | 2 years |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 4 years |  |
Revenue Recognition |  |  |
Revenue, Performance Obligation, Description of Payment Terms | 30 |  |
Restricted Stock Award |  |  |
Award vesting period | 1 year |  |
Minimum | Subscription and Circulation [Member] |  |  |
Revenue Recognition |  |  |
Capitalized Contract Cost, Amortization Period | 3 years |  |
Minimum | Software and Software Development Costs [Member] |  |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Maximum |  |  |
Property, Plant and Equipment [Abstract] |  |  |
Property and equipment, useful life | 5 years |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 15 years |  |
Revenue Recognition |  |  |
Revenue, Performance Obligation, Description of Payment Terms | 60 |  |
Restricted Stock Award |  |  |
Award vesting period | 4 years |  |
Maximum | Subscription and Circulation [Member] |  |  |
Revenue Recognition |  |  |
Capitalized Contract Cost, Amortization Period | 5 years |  |
Maximum | Software and Software Development Costs [Member] |  |  |
Segment Reporting [Abstract] |  |  |
Finite-Lived Intangible Asset, Useful Life | 10 years |  |

X
- Definition Percentage Of Annual Performance Stock Grant Based On Achieving Annual Increase in Stand-alone Software Goal + References No definition available. + Details
Name: | ffiv_PercentageOfAnnualPerformanceStockGrantBasedOnAchievingAnnualIncreaseinStandaloneSoftwareGoal
Namespace Prefix: | ffiv_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Annual Performance Stock Grant Based On Achieving Annual Revenue Goal + References No definition available. + Details
Name: | ffiv_PercentageOfAnnualPerformanceStockGrantBasedOnAchievingAnnualRevenueGoal
Namespace Prefix: | ffiv_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Annual Performance Stock Grant Based On Achieving EPS Goal + References No definition available. + Details
Name: | ffiv_PercentageOfAnnualPerformanceStockGrantBasedOnAchievingEPSGoal
Namespace Prefix: | ffiv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Annual Performance Stock Grant Based On Achieving Relative Total Shareholder Return Benchmarked to the S&P 500 Index Goal + References No definition available. + Details
Name: | ffiv_PercentageOfAnnualPerformanceStockGrantBasedOnAchievingRelativeTotalShareholderReturnBenchmarkedtotheSP500IndexGoal
Namespace Prefix: | ffiv_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage Of Over-Achievement To Which Annual Performance Based Vesting Cannot Exceed + References No definition available. + Details
Name: | ffiv_PercentageOfOverAchievementToWhichAnnualPerformanceBasedVestingCannotExceed
Namespace Prefix: | ffiv_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 720 -SubTopic 35 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483406/720-35-50-1 + Details
Name: | us-gaap_AdvertisingExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortization period of cost capitalized in obtaining or fulfilling contract with customer, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -SubTopic 40 -Topic 340 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479483/340-40-50-2 + Details
Name: | us-gaap_CapitalizedContractCostAmortizationPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_FiniteLivedIntangibleAssetUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_GuaranteesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_MarketingAndAdvertisingExpenseAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 18 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-18 + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RestrictedStockAwardForfeituresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Description of payment terms in contract with customer. Includes, but is not limited to, timing of payment, existence of financing component, variability of consideration and constraint on variable consideration. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479806/606-10-50-12 + Details
Name: | us-gaap_RevenuePerformanceObligationDescriptionOfPaymentTerms
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RevenueRecognitionAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
Name: | us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Describes the nature of the product warranty, including the approximate term of the product warranty, how the product warranty arose, and the events or circumstances that would require the warrantor to perform under the product warranty. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482425/460-10-50-8 + Details
Name: | us-gaap_StandardProductWarrantyDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AwardTypeAxis=us-gaap_RestrictedStockUnitsRSUMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PlanNameAxis=ffiv_AnnualEquityProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_MaintenanceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=ffiv_HardwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=us-gaap_SubscriptionAndCirculationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |