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Fair Value of Financial Instruments - Summary (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 30, 2017
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Financial assets and liabilities measured at fair value on a recurring basis |  |
Total short-term investments | $ 347,416 | $ 494,657
Recurring | 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 | 82,111 | 159,662
Total short-term investments | 71,459 | 94,575
Total assets at fair value | 153,570 | 254,237
Recurring | 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 | 82,111 | 106,047
Recurring | 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 |  | 53,615
Total short-term investments | 71,459 | 94,575
Recurring | Significant Other Observable Inputs (Level 2) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 32,265 | 12,684
Total short-term investments | 275,957 | 400,082
Total assets at fair value | 308,222 | 412,766
Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 23,906 | 11,231
Total short-term investments | 151,635 | 171,835
Recurring | Significant Other Observable Inputs (Level 2) | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 8,359 | 1,453
Total short-term investments | 124,322 | 228,247
Recurring | Significant Unobservable Inputs (Level 3) |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,642 | 5,681
Total assets at fair value | 5,642 | 5,681
Recurring | Significant Unobservable Inputs (Level 3) | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | 5,642 | 5,681
Recurring | Fair Value |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 114,376 | 172,346
Total short-term investments | 347,416 | 494,657
Other assets, net | 5,642 | 5,681
Total assets at fair value | 467,434 | 672,684
Recurring | Fair Value | Money market funds |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 82,111 | 106,047
Recurring | Fair Value | Corporate debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 23,906 | 11,231
Total short-term investments | 151,635 | 171,835
Recurring | Fair Value | Government debt securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Total cash equivalents | 8,359 | 55,068
Total short-term investments | 195,781 | 322,822
Recurring | Fair Value | Auction rate securities |  |
Financial assets and liabilities measured at fair value on a recurring basis |  |
Other assets, net | $ 5,642 | $ 5,681

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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=66048111&loc=d3e19207-110258 + 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 No definition available. + Details
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