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Cash and Investments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 28, 2013 | Dec. 29, 2012
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 92,865 | $ 109,910
Gross Unrealized Gains | 35 | 10
Gross Unrealized Losses | (10) | (12)
Estimated Fair Market Value | 92,890 | 109,908
Cash and Cash equivalents [Member] | Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 43,085 | 60,206
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 43,085 | 60,206
Cash and Cash equivalents [Member] | Money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 748 | 109
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 748 | 109
Cash and Cash equivalents [Member] | Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 2,600
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Estimated Fair Market Value |  | 2,600
Short-term investments [Member] | Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 950 | 3,199
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 950 | 3,199
Short-term investments [Member] | US Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,048 | 4,996
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 5,048 | 4,997
Short-term investments [Member] | US Government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 15,685 | 15,567
Gross Unrealized Gains | 8 | 6
Gross Unrealized Losses | (4) | (2)
Estimated Fair Market Value | 15,689 | 15,571
Short-term investments [Member] | Municipal securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 8,546 | 5,396
Gross Unrealized Gains | 11 | 1
Gross Unrealized Losses | 0 | (1)
Estimated Fair Market Value | 8,557 | 5,396
Short-term investments [Member] | Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,803 | 17,837
Gross Unrealized Gains | 16 | 2
Gross Unrealized Losses | (6) | (9)
Estimated Fair Market Value | $ 18,813 | $ 17,830

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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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