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Cash and Investments (Details) (USD $) In Thousands, unless otherwise specified | Mar. 29, 2014 | Dec. 28, 2013
--- | --- | ---
Cash and Cash equivalents [Member] | Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 38,247 | $ 43,139
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 38,247 | 43,139
Cash and Cash equivalents [Member] | Money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 586 | 876
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 586 | 876
Cash and Cash equivalents [Member] | Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 750
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Market Value |  | 750
Short-term investments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 88,028 | 92,853
Gross Unrealized Gains | 19 | 22
Gross Unrealized Losses | (10) | (13)
Estimated Fair Market Value | 88,037 | 92,862
Short-term investments [Member] | Commercial paper and corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 800 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 800 |
Short-term investments [Member] | US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,022 | 5,036
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 5,023 | 5,036
Short-term investments [Member] | US Government Agencies Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,768 | 11,980
Gross Unrealized Gains | 6 | 4
Gross Unrealized Losses | (2) | (4)
Estimated Fair Market Value | 11,772 | 11,980
Short-term investments [Member] | Municipal securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 10,367 | 9,756
Gross Unrealized Gains | 7 | 11
Gross Unrealized Losses | (1) | (4)
Estimated Fair Market Value | 10,373 | 9,763
Short-term investments [Member] | Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,238 | 21,316
Gross Unrealized Gains | 5 | 7
Gross Unrealized Losses | (7) | (5)
Estimated Fair Market Value | $ 21,236 | $ 21,318

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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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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