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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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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
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-Paragraph 1
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-Topic 320
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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