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Cash and Investments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 27, 2014 | Dec. 28, 2013
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 84,371 | $ 92,853
Gross Unrealized Gains | 19 | 22
Gross Unrealized Losses | (17) | (13)
Estimated Fair Market Value | 84,373 | 92,862
Cash and Cash equivalents [Member] | Cash [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 34,426 | 43,139
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 34,426 | 43,139
Cash and Cash equivalents [Member] | Money market funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 549 | 876
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 549 | 876
Cash and Cash equivalents [Member] | Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 650 | 750
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 650 | 750
Short-term investments [Member] | Commercial paper [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 700 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Estimated Fair Market Value | 700 |
Short-term investments [Member] | U.S. Treasury securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 2,497 | 5,036
Gross Unrealized Gains | 1 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Market Value | 2,498 | 5,036
Short-term investments [Member] | U.S. Government agency securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,685 | 11,980
Gross Unrealized Gains | 6 | 4
Gross Unrealized Losses | (4) | (4)
Estimated Fair Market Value | 18,687 | 11,980
Short-term investments [Member] | Municipal securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 5,014 | 9,756
Gross Unrealized Gains | 3 | 11
Gross Unrealized Losses | (2) | (4)
Estimated Fair Market Value | 5,015 | 9,763
Short-term investments [Member] | Corporate debt securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 21,850 | 21,316
Gross Unrealized Gains | 9 | 7
Gross Unrealized Losses | (11) | (5)
Estimated Fair Market Value | $ 21,848 | $ 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 Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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