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Cash and Investments - Investments by Security Type (Details) - USD ($) $ in Thousands | Mar. 30, 2018 | Dec. 29, 2017
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Investment [Line Items] |  |
Amortized Cost | $ 505,159 | $ 440,756
Gross Unrealized Gains | 13 | 18
Gross Unrealized Losses | (900) | (364)
Fair Value | 504,272 | 440,410
Money market funds |  |
Investment [Line Items] |  |
Amortized Cost | 55,241 | 45,478
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 55,241 | 45,478
Commercial paper |  |
Investment [Line Items] |  |
Amortized Cost | 237,067 | 199,647
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 237,067 | 199,647
Corporate bonds |  |
Investment [Line Items] |  |
Amortized Cost | 191,361 | 179,336
Gross Unrealized Gains | 13 | 18
Gross Unrealized Losses | (843) | (332)
Fair Value | 190,531 | 179,022
U.S. Treasury and government sponsored enterprises |  |
Investment [Line Items] |  |
Amortized Cost | 21,490 | 16,295
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (57) | (32)
Fair Value | $ 21,433 | $ 16,263

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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