Document and Entity Information - USD ($)
12 Months Ended
Dec. 30, 2017
Feb. 12, 2018
Jul. 01, 2017
Document and Entity Information [Abstract]      
Entity Registrant Name IROBOT CORP    
Entity Central Index Key 0001159167    
Document Type 10-K    
Document Period End Date Dec. 30, 2017    
Amendment Flag false    
Document Fiscal Year Focus 2017    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-30    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Large Accelerated Filer    
Entity Public Float     $ 2,300,000,000
Entity Common Stock, Shares Outstanding   27,945,275