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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Jul. 04, 2015 | Jan. 03, 2015
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | $ 125,051 | $ 141,706
Total short-term investments | 147,556 | 193,489
Total long-term investments | 7,179 | 7,419
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 43,689 | 72,415
Total short-term investments |  | 650
Total assets at fair value | 43,689 | 73,065
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 43,689 | 71,415
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,000
Total short-term investments |  | 650
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 15,913 | 17,147
Total short-term investments | 147,556 | 192,839
Derivative instruments |  | 331
Other assets, net |  | 331
Total assets at fair value | 163,469 | 210,317
Total liabilities at fair value | 35 |
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Other non-current liabilities: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Derivative instruments | 35 |
Total liabilities at fair value | 35 |
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Certificates of deposit |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,547 | 7,739
Total short-term investments |  | 250
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Commercial paper |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 5,348
Total short-term investments | 1,199 | 8,995
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Municipal bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 543 | 1,757
Total short-term investments | 122,199 | 129,152
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Variable-rate demand notes |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 14,495 | 12,915
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Asset-backed securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments |  | 5,377
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | International government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 2,237 | 2,516
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | US government agency |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,202
Total short-term investments |  | 601
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 9,823 | 1,101
Total short-term investments | 7,426 | 33,033
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 7,179 | 7,419
Total assets at fair value | 7,179 | 7,419
Total liabilities at fair value | 15,092 | 18,438
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Accrued expenses: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration | 3,965 | 4,288
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Other non-current liabilities: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration | 11,127 | 14,150
Total liabilities at fair value | 11,127 |
Assets and liabilities measured at fair value on recurring basis | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 7,179 | 7,419
Assets and liabilities measured at fair value on recurring basis | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 59,602 | 89,562
Total short-term investments | 147,556 | 193,489
Total long-term investments | 7,179 | 7,419
Derivative instruments |  | 331
Other assets, net |  | 331
Total assets at fair value | 214,337 | 290,801
Total liabilities at fair value | 15,127 | 18,438
Assets and liabilities measured at fair value on recurring basis | Fair Value | Accrued expenses: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration | 3,965 | 4,288
Assets and liabilities measured at fair value on recurring basis | Fair Value | Other non-current liabilities: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration | 11,127 | 14,150
Derivative instruments | 35 |
Total liabilities at fair value | 11,162 |
Assets and liabilities measured at fair value on recurring basis | Fair Value | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 43,689 | 71,415
Assets and liabilities measured at fair value on recurring basis | Fair Value | Certificates of deposit |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 5,547 | 7,739
Total short-term investments |  | 250
Assets and liabilities measured at fair value on recurring basis | Fair Value | Commercial paper |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 5,348
Total short-term investments | 1,199 | 8,995
Assets and liabilities measured at fair value on recurring basis | Fair Value | Municipal bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 543 | 1,757
Total short-term investments | 122,199 | 129,152
Assets and liabilities measured at fair value on recurring basis | Fair Value | Variable-rate demand notes |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 14,495 | 12,915
Assets and liabilities measured at fair value on recurring basis | Fair Value | Asset-backed securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments |  | 5,377
Assets and liabilities measured at fair value on recurring basis | Fair Value | International government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 2,237 | 2,516
Assets and liabilities measured at fair value on recurring basis | Fair Value | US government agency |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,202
Total short-term investments |  | 601
Assets and liabilities measured at fair value on recurring basis | Fair Value | Corporate bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 9,823 | 1,101
Total short-term investments | 7,426 | 33,033
Assets and liabilities measured at fair value on recurring basis | Fair Value | U.S. government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,000
Total short-term investments |  | 650
Assets and liabilities measured at fair value on recurring basis | Fair Value | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | $ 7,179 | $ 7,419

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- Definition Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature more than one year from the balance sheet date or operating cycle, if longer. + 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 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 + 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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