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Investments (Summary by Security Type) (Details) - USD ($) $ in Thousands | Dec. 29, 2017 | Dec. 30, 2016
--- | --- | ---
Investment [Line Items] |  |
Amortized Cost | $ 440,756 | $ 460,274
Gross Unrealized Gains | 18 | 14
Gross Unrealized Losses | (364) | (322)
Fair Value | 440,410 | 459,966
Money market funds [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 45,478 | 71,457
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 45,478 | 71,457
Commercial paper [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 199,647 | 165,375
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Fair Value | 199,647 | 165,375
Corporate bonds [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 179,336 | 152,712
Gross Unrealized Gains | 18 | 3
Gross Unrealized Losses | (332) | (308)
Fair Value | 179,022 | 152,407
US Treasury and Government [Member] |  |
Investment [Line Items] |  |
Amortized Cost | 16,295 | 70,730
Gross Unrealized Gains | 0 | 11
Gross Unrealized Losses | (32) | (14)
Fair Value | $ 16,263 | $ 70,727

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