v2.4.0.8

Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified | 1 Months Ended
--- | ---
Jan. 31, 2014
Subsequent Event [Member] |
Subsequent Event [Line Items] |
Covenant-not-to-sue | $ 20.0
Covenant Not to Sue, Term | 6 years

X
- Definition Covenant Not to Sue, Term + References No definition available. + Details
Name: | ftnt_CovenantNottoSueTerm
Namespace Prefix: | ftnt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of judgment or settlement awarded to (against) the entity in respect of litigation. + References No definition available. + Details
Name: | us-gaap_LitigationSettlementAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration