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Goodwill, Other Intangible Assets and Other Assets - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended 6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Dec. 28, 2013
Jun. 28, 2014
Minimum
Jun. 28, 2014
Maximum
Oct. 02, 2012
Home Robots
Evolution Robotics, Inc. (ER)
Jun. 28, 2014
Defense & Security
Nekton Research LLC [Member]
Business Acquisition [Line Items]                  
Goodwill $ 48,751,000   $ 48,751,000   $ 48,751,000     $ 41,100,000 $ 7,700,000
Estimated useful life of intangible assets           2 years 10 years    
Amortization of Acquired Intangible Assets $ 900,000 $ 1,000,000 $ 1,800,000 $ 1,900,000