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Income Taxes (Details Textual) - USD ($) | Jan. 02, 2016 | Dec. 27, 2014 | Dec. 28, 2013 | Dec. 29, 2012
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Income Taxes (Textual) [Abstract] |  |  |  |
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued | $ 0 | $ 0 | $ 0 |
Deferred tax liability not established for undistributed earnings of non-US subsidiaries | 1,000,000 |  |  |
Net deferred tax assets | 31,721,000 | 29,914,000 |  |
Decrease in unrecognised tax benefits due to settlement of federal tax audit | 200,000 |  |  |
Unrecognized Tax Benefit to the income tax provision if it become recognizable | 2,100,000 |  |  |
Unrecognized Tax Benefit, related to stock-based compensation, state NOLs | 1,000,000 | 0 |  |
Unrecognized Tax Benefits | 600,000 | 500,000 |  |
Deferred Tax Assets, Valuation Allowance | 0 | 0 | $ 2,090,000 | $ 2,691,000
Evolution Robotics, Inc. (ER) [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating Loss Carryforwards | 23,000,000 |  |  |
Research Tax Credit Carryforward [Member] | Evolution Robotics, Inc. (ER) [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Tax Credit Carryforward, Amount | 2,200,000 |  |  |
Investment Tax Credit Carryforward [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Tax Credit Carryforward, Amount | 300,000 | 700,000 |  |
State and Local Jurisdiction [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating Loss Carryforwards | 8,000,000 | 15,100,000 |  |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Tax Credit Carryforward, Amount | 1,000,000 | 1,000,000 |  |
State and Local Jurisdiction [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Operating Loss Carryforwards | 15,000,000 | 19,400,000 |  |
State and Local Jurisdiction [Member] | Research Tax Credit Carryforward [Member] |  |  |  |
Income Taxes (Textual) [Abstract] |  |  |  |
Tax Credit Carryforward, Amount | $ 9,300,000 | $ 8,100,000 |  |

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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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