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Industry Segment, Geographic Information and Significant Customers - Segment Information about Revenue, Cost of Revenue, Gross Margin and Income before Income Taxes (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Sep. 27, 2014
Sep. 28, 2013
Revenue:        
Total revenue $ 143,497 $ 124,501 $ 397,504 $ 361,058
Cost of revenue:        
Total cost of revenue 75,608 70,440 215,784 198,865
Gross margin:        
Gross margin 67,889 54,061 181,720 162,193
Research and development 17,343 15,212 51,522 [1] 45,617 [1]
Selling and marketing 15,844 16,317 53,911 [1] 49,323 [1]
General and administrative 12,008 11,495 35,938 [1] 39,348 [1]
Other income (expense), net (374) 152 (469) (49)
Income before income taxes 22,320 11,189 39,880 27,856
Home Robots
        
Revenue:        
Total revenue 132,013 111,363 373,283 319,590
Cost of revenue:        
Total cost of revenue 65,135 58,300 186,991 162,411
Gross margin:        
Gross margin 66,878 53,063 186,292 157,179
Defense & Security
        
Revenue:        
Total revenue 10,667 10,094 21,369 33,664
Cost of revenue:        
Total cost of revenue 4,977 5,981 11,725 18,348
Gross margin:        
Gross margin 5,690 4,113 9,644 15,316
Other
        
Revenue:        
Total revenue 817 3,044 2,852 7,804
Cost of revenue:        
Total cost of revenue 5,496 6,159 17,068 18,106
Gross margin:        
Gross margin $ (4,679) $ (3,115) $ (14,216) $ (10,302)
[1] Total stock-based compensation recorded in the three and nine months ended September 27, 2014 and September 28, 2013 included in the above figures breaks down by expense classification as follows: Three Months Ended Nine Months Ended September 27, 2014 September 28, 2013 September 27, 2014 September 28, 2013Cost of revenue$291 $250 $626 $496Research and development866 669 2,425 1,963Selling and marketing319 348 860 832General and administrative2,315 2,210 6,105 6,378