Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Jan. 31, 2018	Apr. 06, 2018	Jul. 31, 2017
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jan. 31, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	FY
Trading Symbol	TNTR
Entity Registrant Name	Tintri, Inc.
Entity Central Index Key	0001554875
Current Fiscal Year End Date	--01-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		33,589,244
Entity Public Float			$ 49.5