v3.19.1
Document and Entity Information Document - shares
3 Months Ended
Mar. 31, 2019
Apr. 30, 2019
Entity Information [Line Items]    
Entity Registrant Name ITRON INC /WA/  
Entity Central Index Key 0000780571  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Entity Small Business false  
Document Type 10-Q  
Document Period End Date Mar. 31, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q1  
Amendment Flag false  
Trading Symbol ITRI  
Entity Common Stock, Shares Outstanding   39,349,003