XML 68 R50.htm IDEA: XBRL DOCUMENT v3.23.3

Fair Value Measurements - Schedule of Impairment Charges by Income Statement Line Item (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Property, Plant and Equipment [Line Items]
Impairment of assets	$ 3,455	$ 6,175	$ 40,698
Cost of net product revenue
Property, Plant and Equipment [Line Items]
Impairment of assets	0	0	2,865
Cost of net service revenue
Property, Plant and Equipment [Line Items]
Impairment of assets	0	0	3,492
Selling and Marketing Expense
Property, Plant and Equipment [Line Items]
Impairment of assets	0	6,175	11,515
Research and Development Expense
Property, Plant and Equipment [Line Items]
Impairment of assets	0	0	12,974
General and Administrative Expense
Property, Plant and Equipment [Line Items]
Impairment of assets	0	0	9,852
Restructuring Charges
Property, Plant and Equipment [Line Items]
Impairment of assets	$ 3,455	$ 0	$ 0

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482130/360-10-45-4

+ Details

Name:	us-gaap_AssetImpairmentCharges
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ffiv_ImpairedLongLivedAssetsByCostCenterAxis=ffiv_CostOfNetProductRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ffiv_ImpairedLongLivedAssetsByCostCenterAxis=ffiv_CostOfNetServiceRevenueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ffiv_ImpairedLongLivedAssetsByCostCenterAxis=us-gaap_SellingAndMarketingExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ffiv_ImpairedLongLivedAssetsByCostCenterAxis=us-gaap_ResearchAndDevelopmentExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ffiv_ImpairedLongLivedAssetsByCostCenterAxis=us-gaap_GeneralAndAdministrativeExpenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ffiv_ImpairedLongLivedAssetsByCostCenterAxis=us-gaap_RestructuringChargesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: