Document and Entity Information - USD ($)	12 Months Ended
	Mar. 31, 2020	May 29, 2020	Sep. 30, 2019
Document and Entity Information
Entity Registrant Name	ITERIS, INC.
Entity Central Index Key	0000350868
Document Type	10-K
Document Period End Date	Mar. 31, 2020
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Public Float			$ 233,300,000
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		40,732,994
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY