Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Feb. 28, 2018	Jul. 31, 2017
Document and Entity Information [Abstract]
Entity Registrant Name	YEXT, INC.
Entity Central Index Key	0001614178
Current Fiscal Year End Date	--01-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	Jan. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Common Stock, Shares Outstanding		94,174,107
Entity Well-known Seasoned Issuer	No
Entity Public Float			$ 465.1
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes