Document and Entity Information
Jul. 08, 2020
Cover [Abstract]  
Document Type 8-K
Amendment Flag false
Document Period End Date Jul. 08, 2020
Entity Registrant Name FORESCOUT TECHNOLOGIES, INC.
Entity Central Index Key 0001145057
Entity Incorporation, State or Country Code DE
Entity File Number 001-38253
Entity Tax Identification Number 51-0406800
Entity Address, Address Line One 190 West Tasman Drive
Entity Address, City or Town San Jose
Entity Address, State or Province CA
Entity Address, Postal Zip Code 95134
City Area Code 408
Local Phone Number 213-3191
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Title of 12(b) Security Common Stock, par value $0.001 per share
Trading Symbol FSCT
Security Exchange Name NASDAQ
Entity Emerging Growth Company false