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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | Sep. 27, 2014 | Dec. 28, 2013
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | $ 111,705 | $ 95,800
Total short-term investments | 216,973 | 179,593
Total long-term investments | 11,505 | 10,632
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 | 28,036 | 39,538
Total short-term investments | 650 |
Total assets at fair value | 28,686 | 39,538
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 | 28,036 | 39,538
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 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 | 20,385 | 10,718
Total short-term investments | 216,323 | 179,593
Derivative instruments | 507 | 513
Other assets, net | 507 | 513
Total assets at fair value | 237,215 | 190,824
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 | 14,147 | 2,499
Total short-term investments | 11,439 | 3,748
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 | 5,331 | 7,768
Total short-term investments | 850 |
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 | 907 | 451
Total short-term investments | 143,449 | 119,460
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 short-term investments | 36,014 | 17,844
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 | 15,755 | 38,025
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 | 5,687 | 516
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 | 2,528 |
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 short-term investments | 601 |
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 | 11,505 | 10,632
Total assets at fair value | 11,505 | 10,632
Total liabilities at fair value | 17,959 | 12,919
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 | 6,279 |
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 | 11,680 | 12,919
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 | 11,505 | 10,632
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 | 48,421 | 50,256
Total short-term investments | 216,973 | 179,593
Total long-term investments | 11,505 | 10,632
Derivative instruments | 507 | 513
Other assets, net | 507 | 513
Total assets at fair value | 277,406 | 240,994
Total liabilities at fair value | 17,959 | 12,919
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 | 6,279 |
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 | 11,680 | 12,919
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 | 28,036 | 39,538
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 | 14,147 | 2,499
Total short-term investments | 11,439 | 3,748
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 | 5,331 | 7,768
Total short-term investments | 850 |
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 | 907 | 451
Total short-term investments | 143,449 | 119,460
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 short-term investments | 36,014 | 17,844
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 | 15,755 | 38,025
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 | 5,687 | 516
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 | 2,528 |
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 short-term investments | 650 |
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 short-term investments | 601 |
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 | $ 11,505 | $ 10,632

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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=36462937&loc=d3e19207-110258 + Details
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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 For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + 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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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=35750535&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=36459792&loc=SL20226008-175313 + Details
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- Definition Fair value of financial and nonfinancial obligations. + 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=36462937&loc=d3e19207-110258 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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