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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Oct. 03, 2015 | Jan. 03, 2015
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | $ 135,640 | $ 141,706
Total short-term investments | 112,670 | 193,489
Total long-term investments | 7,240 | 7,419
Assets and liabilities measured at fair value on recurring basis |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 67,219 | 89,562
Total short-term investments | 112,670 | 193,489
Total long-term investments | 7,240 | 7,419
Derivative instruments |  | 331
Other assets, net |  | 331
Total assets at fair value | 187,129 | 290,801
Total liabilities at fair value | 13,591 | 18,438
Assets and liabilities measured at fair value on recurring basis | Accrued expenses: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration, current | 4,070 | 4,288
Assets and liabilities measured at fair value on recurring basis | Other non-current liabilities: |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Contingent consideration, noncurrent | 9,192 | 14,150
Derivative instruments | 329 |
Total liabilities at fair value | 9,521 |
Assets and liabilities measured at fair value on recurring basis | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 63,316 | 71,415
Assets and liabilities measured at fair value on recurring basis | Certificates of deposit |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 3,903 | 7,739
Total short-term investments |  | 250
Assets and liabilities measured at fair value on recurring basis | Commercial paper |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 5,348
Total short-term investments |  | 8,995
Assets and liabilities measured at fair value on recurring basis | Municipal bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,757
Total short-term investments | 98,741 | 129,152
Assets and liabilities measured at fair value on recurring basis | Variable-rate demand notes |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 9,495 | 12,915
Assets and liabilities measured at fair value on recurring basis | 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 | International government bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | 2,235 | 2,516
Assets and liabilities measured at fair value on recurring basis | 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 | Corporate bonds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,101
Total short-term investments | 2,199 | 33,033
Assets and liabilities measured at fair value on recurring basis | 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 | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total long-term investments | 7,240 | 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 | 63,316 | 72,415
Total short-term investments |  | 650
Total assets at fair value | 63,316 | 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 | 63,316 | 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 | 3,903 | 17,147
Total short-term investments | 112,670 | 192,839
Derivative instruments |  | 331
Other assets, net |  | 331
Total assets at fair value | 116,573 | 210,317
Total liabilities at fair value | 329 |
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 | 329 |
Total liabilities at fair value | 329 |
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 | 3,903 | 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 |  | 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 |  | 1,757
Total short-term investments | 98,741 | 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 | 9,495 | 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 | 2,235 | 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 |  | 1,101
Total short-term investments | 2,199 | 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 | 7,240 | 7,419
Total assets at fair value | 7,240 | 7,419
Total liabilities at fair value | 13,262 | 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, current | 4,070 | 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, noncurrent | 9,192 | 14,150
Total liabilities at fair value | 9,192 |
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 | $ 7,240 | $ 7,419

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