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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
	Mar. 29, 2014	Mar. 30, 2013
Revenue:
Total revenue	$ 114,204	$ 106,195
Cost of revenue:
Total cost of revenue	62,494	59,668
Gross margin:
Gross margin	51,710	46,527
Research and development	16,934	14,408
Selling and marketing	14,532	10,697
General and administrative	12,264	12,458
Other income (expense), net	(187)	(96)
Income before income taxes	7,793	8,868
Home Robots
Revenue:
Total revenue	108,035	92,699
Cost of revenue:
Total cost of revenue	53,595	48,025
Gross margin:
Gross margin	54,440	44,674
Defense & Security
Revenue:
Total revenue	5,602	11,100
Cost of revenue:
Total cost of revenue	3,518	5,825
Gross margin:
Gross margin	2,084	5,275
Other
Revenue:
Total revenue	567	2,396
Cost of revenue:
Total cost of revenue	5,381	5,818
Gross margin:
Gross margin	$ (4,814)	$ (3,422)

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- Definition

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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