Document and Entity Information - USD ($)
$ in Billions
12 Months Ended
Dec. 28, 2019
Jan. 31, 2020
Dec. 29, 2018
Document and Entity Information [Abstract]      
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol IRBT    
Security Exchange Name NASDAQ    
Entity Address, State or Province MA    
Entity Incorporation, State or Country Code DE    
Document Transition Report false    
Document Annual Report true    
Common Stock, Shares, Outstanding 28,352,390   27,788,272
Entity Registrant Name iROBOT CORPORATION    
Entity Central Index Key 0001159167    
Document Type 10-K    
Entity File Number 001-36414    
Document Period End Date Dec. 28, 2019    
Amendment Flag false    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-28    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float $ 2.5    
Entity Common Stock, Shares Outstanding   28,352,390  
Entity Tax Identification Number 77-0259335    
Entity Address, Address Line One 8 Crosby Drive    
Entity Address, City or Town Bedford    
Entity Address, Postal Zip Code 01730    
City Area Code 781    
Local Phone Number 430-3000    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes