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Summary of Significant Accounting Policies (Cash, Cash Equivalents and Investments) (Details) - USD ($) $ in Thousands | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016 | Jan. 03, 2015
--- | --- | --- | --- | ---
Schedule of Investments [Line Items] |  |  |  |
Cash and cash equivalents | $ 23,348 | $ 36,312 | $ 28,548 | $ 34,144
Short-term investments | 2,015 | 2,252 |  |
Long-term investments | 10,479 | 10,033 |  |
Amortized cost basis of debt securities | 12,660 | 12,445 |  |
Debt securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Short-term investments | 2,015 | 2,252 |  |
Long-term investments | 10,479 | 10,033 |  |
Cash and money market accounts |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Cash and cash equivalents | 23,348 | 36,312 |  |
Short-term investments | 0 | 0 |  |
Long-term investments | $ 0 | $ 0 |  |

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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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