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Fair Value Measurements and Disclosures (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified | Dec. 28, 2013 | Dec. 29, 2012
--- | --- | ---
Cash [Member] |  |
Assets: |  |
Cash and Cash Equivalents | $ 43,100 | $ 60,200
Level 1 [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 876 | 110
Marketable Securities | 5,036 | 4,997
Total assets: | 5,912 | 5,107
Liabilities: |  |
Contingent consideration payable | 0 | 0
Level 1 [Member] | Money market funds [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 876 | 110
Level 1 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Marketable Securities | 5,036 | 4,997
Level 1 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 0 | 0
Marketable Securities | 0 | 0
Level 2 [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 750 | 2,600
Marketable Securities | 43,061 | 41,996
Total assets: | 43,811 | 44,596
Liabilities: |  |
Contingent consideration payable | 0 | 0
Level 2 [Member] | Money market funds [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 0 | 0
Level 2 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Marketable Securities | 11,980 | 19,130
Level 2 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 750 | 2,600
Marketable Securities | 31,081 | 22,866
Level 3 [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 0 | 0
Marketable Securities | 0 | 0
Total assets: | 0 | 0
Liabilities: |  |
Contingent consideration payable | 2,783 | 2,462
Level 3 [Member] | Money market funds [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 0 | 0
Level 3 [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Marketable Securities | 0 | 0
Level 3 [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 0 | 0
Marketable Securities | 0 | 0
Total [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 1,626 | 2,710
Marketable Securities | 48,097 | 46,993
Total assets: | 49,723 | 49,703
Liabilities: |  |
Contingent consideration payable | 2,783 | 2,462
Total [Member] | Money market funds [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 876 | 110
Total [Member] | U.S. Treasury, U.S. Government and U.S. Government agency debt securities [Member] |  |
Assets: |  |
Marketable Securities | 17,016 | 24,127
Total [Member] | Commercial paper and corporate debt securities [Member] |  |
Assets: |  |
Cash and Cash Equivalents | 750 | 2,600
Marketable Securities | $ 31,081 | $ 22,866

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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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 Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 + Details
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