Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2020	Jan. 31, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	000-22418
Entity Registrant Name	ITRON, INC.
Entity Incorporation, State or Country Code	WA
Entity Tax Identification Number	91-1011792
Entity Address, Address Line One	2111 N Molter Road
Entity Address, City or Town	Liberty Lake
Entity Address, State or Province	WA
Entity Address, Postal Zip Code	99019
City Area Code	(509)
Local Phone Number	924-9900
Title of 12(b) Security	Common stock, no par value
Trading Symbol	ITRI
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 2,649,283,506
Entity Common Stock, Shares Outstanding		40,455,126
Documents Incorporated by Reference	DOCUMENTS INCORPORATED BY REFERENCEThe information called for by Part III is incorporated by reference to the definitive Proxy Statement for the Annual Meeting of Shareholders of the Company to be held on May 13, 2021.
Entity Central Index Key	0000780571
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false