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Investments (Gross Unrealized Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 29, 2017	Dec. 30, 2016
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position, fair value, less than 12 months	$ 154,357	$ 169,214
Gross unrealized losses, less than 12 months	(319)	(319)
Unrealized loss position, fair value,12 months or greater	22,698	3,001
Gross unrealized losses, 12 months or greater	(45)	(3)
Unrealized loss position, fair value	177,055	172,215
Gross unrealized losses	(364)	(322)
Corporate bonds [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position, fair value, less than 12 months	140,746	140,559
Gross unrealized losses, less than 12 months	(296)	(305)
Unrealized loss position, fair value,12 months or greater	20,047	3,001
Gross unrealized losses, 12 months or greater	(36)	(3)
Unrealized loss position, fair value	160,793	143,560
Gross unrealized losses	(332)	(308)
US Treasury and Government [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position, fair value, less than 12 months	13,611	27,657
Gross unrealized losses, less than 12 months	(23)	(14)
Unrealized loss position, fair value,12 months or greater	2,651	0
Gross unrealized losses, 12 months or greater	(9)	0
Unrealized loss position, fair value	16,262	27,657
Gross unrealized losses	$ (32)	(14)
Commercial paper [Member]
Schedule of Available-for-sale Securities [Line Items]
Unrealized loss position, fair value, less than 12 months		998
Gross unrealized losses, less than 12 months		0
Unrealized loss position, fair value,12 months or greater		0
Gross unrealized losses, 12 months or greater		0
Unrealized loss position, fair value		998
Gross unrealized losses		$ 0

X

- Definition

Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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Amount of unrealized loss on 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 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
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Amount of unrealized loss on investments in available-for-sale securities that have been in a loss position for less than twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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