Cover page - USD ($)	12 Months Ended
	Jan. 31, 2020	Mar. 02, 2020	Jul. 31, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Period End Date	Jan. 31, 2020
Document Transition Report	false
Entity File Number	001-38056
Entity Registrant Name	YEXT, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	20-8059722
Entity Address, Address Line One	1 Madison Ave, 5th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10010
City Area Code	212
Local Phone Number	994-3900
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	YEXT
Security Exchange Name	NYSE
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 2,100,000,000
Entity Common Stock, Shares Outstanding		115,847,791
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for its 2020 Annual Meeting of Stockholders (the “Proxy Statement”), to be filed within 120 days of the registrant’s fiscal year ended January 31, 2020, are incorporated by reference in Part III of this Annual Report on Form 10-K. Except with respect to information specifically incorporated by reference in this Form 10-K, the Proxy Statement is not deemed to be filed as part of this Form 10-K.
Entity Central Index Key	0001614178
Current Fiscal Year End Date	--01-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false