| Document and Entity Information | Jun. 01, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jun. 1, 2021 |
| Entity Registrant Name | ITRON, INC. |
| Entity Incorporation, State or Country Code | WA |
| Entity File Number | 000-22418 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000780571 |
| Title of 12(b) Security | Common stock |
| Trading Symbol | ITRI |
| Security Exchange Name | NASDAQ |
