Document And Entity Information
Jul. 17, 2020
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jul. 17, 2020
Entity Registrant Name FORTINET, INC.
Entity Incorporation, State or Country Code DE
Entity File Number 001-34511
Entity Tax Identification Number 77-0560389
Entity Address, Address Line One 899 Kifer Road
Entity Address, City or Town Sunnyvale
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94086
City Area Code 408
Local Phone Number 235-7700
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, $0.001 Par Value
Trading Symbol FTNT
Security Exchange Name NASDAQ
Entity Emerging Growth Company false
Entity Central Index Key 0001262039
Amendment Flag false
Current Fiscal Year End Date --12-31