Cover - shares	3 Months Ended
	Jun. 30, 2022	Aug. 01, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2022
Document Transition Report	false
Entity File Number	001-08762
Entity Registrant Name	ITERIS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	95-2588496
Entity Address, Address Line One	1250 S. Capital of Texas Hwy., Building 1, Suite 330
Entity Address, City or Town	Austin
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	78746
City Area Code	512
Local Phone Number	716-0808
Title of 12(b) Security	Common Stock, $0.10 par value
Trading Symbol	ITI
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		42,577,415
Entity Central Index Key	0000350868
Amendment Flag	false
Current Fiscal Year End Date	--03-31
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q1