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Note 15. Financial Instruments and Fair Value Measurements (Details) - Estimated Fair Value of Financial Instruments, Current Year (USD $) In Thousands, unless otherwise specified | Mar. 30, 2014 | Dec. 29, 2013
--- | --- | ---
Short-Term Investments |  |
Available for Sale Securities | $ 48,405 | $ 49,099
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Short-Term Investments |  |
Available for Sale Securities | 29,943 | 21,993
Commercial Paper, Not Included with Cash and Cash Equivalents [Member] |  |
Short-Term Investments |  |
Available for Sale Securities | 29,943 | 21,993
Corporate Bond Securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Short-Term Investments |  |
Available for Sale Securities | 15,864 | 27,106
Corporate Bond Securities [Member] |  |
Short-Term Investments |  |
Available for Sale Securities | 15,864 | 27,106
Certificates of Deposit [Member] | Fair Value, Inputs, Level 1 [Member] |  |
Short-Term Investments |  |
Available for Sale Securities | 2,598 |
Certificates of Deposit [Member] |  |
Short-Term Investments |  |
Available for Sale Securities | $ 2,598 |

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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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