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Number of customer generating major revenues.

+ References

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Name Accounting Standards Codification
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- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

No definition available.

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Industry Segment, Geographic Information and Significant Customers (Details Textual)	12 Months Ended
	Jan. 02, 2016 USD ($) customer segment	Dec. 27, 2014 USD ($)	Dec. 28, 2013
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Number of reportable segments \| segment	2
Goodwill	$ 48,751,000	$ 48,751,000
Intangible assets, net	$ 15,664,000	$ 19,146,000
Number of customer generating major revenues \| customer	15
Evolution Robotics, Inc. (ER) [Member]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Goodwill	$ 41,000,000
Government Contracts Concentration Risk [Member]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Concentration Risk, Percentage	5.10%	4.30%	6.20%
Foreign [Member] \| Customers [member]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Concentration Risk, Percentage	56.00%	60.90%	59.50%
JAPAN \| Customers [member]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Concentration Risk, Percentage	13.30%	17.00%	19.80%
Home Robots [Member] \| Evolution Robotics, Inc. (ER) [Member]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Goodwill	$ 41,000,000
Intangible assets, net	$ 15,700,000
Home Robots [Member] \| Customers [member]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Concentration Risk, Percentage	76.60%	75.70%	75.30%
Home Robots [Member] \| Major Distributor [Domain]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Concentration Risk, Percentage	26.00%	29.80%	33.20%
Defense & Security Robots [Member] \| Business Acquisition Nekton [Member]
Industry Segment Geographic Information and Significant Customers (Textual) [Abstract]
Goodwill	$ 7,700,000