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Industry Segment, Geographic Information and Significant Customers (Details Textual) | 12 Months Ended
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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 |  |

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