Document and Entity Information - shares	6 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Document and Entity Information
Entity Registrant Name	ITERIS, INC.
Entity Central Index Key	0000350868
Document Type	10-Q
Document Period End Date	Sep. 30, 2019
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		40,575,532
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2