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Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 30, 2017
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | $ 417,867 | $ 494,657
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 | 136,863 | 159,662
Total short-term investments | 65,239 | 94,575
Total assets at fair value | 202,102 | 254,237
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 | 111,866 | 106,047
Assets and liabilities measured at fair value on recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 24,997 | 53,615
Total short-term investments | 65,239 | 94,575
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 | 9,419 | 12,684
Total short-term investments | 352,628 | 400,082
Total assets at fair value | 362,047 | 412,766
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 9,419 | 11,231
Total short-term investments | 133,135 | 171,835
Assets and liabilities measured at fair value on recurring basis | Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents |  | 1,453
Total short-term investments | 219,493 | 228,247
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 |  |
Other assets, net | 5,609 | 5,681
Total assets at fair value | 5,609 | 5,681
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 |  |
Other assets, net | 5,609 | 5,681
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 | 146,282 | 172,346
Total short-term investments | 417,867 | 494,657
Other assets, net | 5,609 | 5,681
Total assets at fair value | 569,758 | 672,684
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 | 111,866 | 106,047
Assets and liabilities measured at fair value on recurring basis | Fair Value | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 9,419 | 11,231
Total short-term investments | 133,135 | 171,835
Assets and liabilities measured at fair value on recurring basis | Fair Value | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 24,997 | 55,068
Total short-term investments | 284,732 | 322,822
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 |  |
Other assets, net | $ 5,609 | $ 5,681

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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 No definition available. + Details
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