XML 94 R76.htm IDEA: XBRL DOCUMENT
v3.25.3

Shareholders' Equity - Narrative (Details) - October Twenty Six Two Thousand Ten Program [Member] - USD ($) $ in Millions | Sep. 30, 2025 | Oct. 25, 2024 | Jul. 25, 2022
--- | --- | --- | ---
Common Stock Repurchase [Line Items] |  |  |
Share Repurchase Program, Authorized, Amount |  | $ 1,000.0 | $ 6,400.0
Share Repurchase Program, Remaining Authorized, Amount | $ 922.4 |  |

X
- Definition [Line Items] for Common Stock Repurchase [Table] + References No definition available. + Details
Name: | ffiv_CommonStockRepurchaseLineItems
Namespace Prefix: | ffiv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 505 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481520/505-30-50-4 + Details
Name: | srt_StockRepurchaseProgramAuthorizedAmount1
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | srt_ShareRepurchaseProgramAxis=ffiv_OctoberTwentySixTwoThousandTenProgramMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |