v3.7.0.1
Document and Entity Information - shares
6 Months Ended
Jul. 01, 2017
Jul. 31, 2017
Entity Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jul. 01, 2017  
Document Fiscal Year Focus 2017  
Document Fiscal Period Focus Q2  
Trading Symbol IRBT  
Entity Registrant Name IROBOT CORP  
Entity Central Index Key 0001159167  
Current Fiscal Year End Date --12-30  
Entity Filer Category Large Accelerated Filer  
Entity Common Stock, Shares Outstanding   27,672,237