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Cover
Apr. 23, 2021
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 23, 2021
Current Fiscal Year End Date --12-31
Entity File Number 001-34511
Entity Registrant Name FORTINET, INC.
Entity Central Index Key 0001262039
Entity Tax Identification Number 77-0560389
Entity Incorporation, State or Country Code DE
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