Available-for-Sale Securities, Accumulated Gross Unrealized Gains, before Tax, Current

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- Definition

Available-for-Sale Securities, Accumulated Gross Unrealized Losses, before Tax, Current

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- Definition

Available-for-Sale Securities, Accumulated Gross Unrealized Losses, before Tax, Non-Current

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- Definition

Available-for-Sale Securities, Accumulated Gross Unrealized Gains, before Tax, Non-Current

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- Definition

Available-for-sale Securities, Amortized Cost Basis, Current

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Available-for-sale Securities, Amortized Cost Basis, Non-Current

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- Definition

Amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer.

+ 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)
-URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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Investments in debt and equity securities which are categorized neither as held-to-maturity nor trading and which are intended to be sold or mature more than one year from the balance sheet date or operating cycle, if longer. Such securities are reported at fair value; unrealized gains (losses) related to Available-for-sale Securities are excluded from earnings and reported in a separate component of shareholders' equity (other comprehensive income), unless the Available-for-sale security is designated as a hedge or is determined to have had an other than temporary decline in fair value below its amortized cost basis. All or a portion of the unrealized holding gain (loss) of an Available-for-sale security that is designated as being hedged in a fair value hedge is recognized in earnings during the period of the hedge, as are other than temporary declines in fair value below the cost basis for investments in equity securities and debt securities that an entity intends to sell or it is more likely than not that it will be required to sell before the recovery of its amortized cost basis. Other than temporary declines in fair value below the cost basis for debt securities categorized as Available-for-sale that an entity does not intend to sell and for which it is not more likely than not that the entity will be required to sell before the recovery of its amortized cost basis are bifurcated into credit losses and losses related to all other factors. Other than temporary declines in fair value below cost basis related to credit losses are recognized in earnings, and losses related to all other factors are recognized in other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26626-111562

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Amount before tax and reclassification adjustments of unrealized holding gain (loss) on available-for-sale securities.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 10A
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section 45
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Marketable Securities - Available for Sale (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 24, 2017	Sep. 25, 2016	Sep. 24, 2017	Sep. 25, 2016
Schedule of Available-for-sale Securities [Line Items]
Net unrealized loss in other comprehensive income	$ 1,081	$ 0	$ 1,081	$ 0
Short-term AFS securities
Amortized cost, short-term AFS securities	336,619		336,619
Gross unrealized gains, short-term AFS securities	36		36
Gross unrealized losses, short-term AFS securities	(213)		(213)
Fair value, short-term AFS securities	336,442		336,442
Long-term AFS securities
Amortized cost, long-term AFS securities	242,686		242,686
Gross unrealized gains, long-term AFS securities	23		23
Gross unrealized losses, long-term AFS securities	(927)		(927)
Fair value, long-term AFS securities	241,782		241,782
U.S Treasury securities
Short-term AFS securities
Amortized cost, short-term AFS securities	73,220		73,220
Gross unrealized gains, short-term AFS securities	0		0
Gross unrealized losses, short-term AFS securities	(45)		(45)
Fair value, short-term AFS securities	73,175		73,175
Long-term AFS securities
Amortized cost, long-term AFS securities	47,672		47,672
Gross unrealized gains, long-term AFS securities	0		0
Gross unrealized losses, long-term AFS securities	(52)		(52)
Fair value, long-term AFS securities	47,620		47,620
Corporate debt securities
Short-term AFS securities
Amortized cost, short-term AFS securities	156,683		156,683
Gross unrealized gains, short-term AFS securities	35		35
Gross unrealized losses, short-term AFS securities	(79)		(79)
Fair value, short-term AFS securities	156,639		156,639
Long-term AFS securities
Amortized cost, long-term AFS securities	97,583		97,583
Gross unrealized gains, long-term AFS securities	21		21
Gross unrealized losses, long-term AFS securities	(259)		(259)
Fair value, long-term AFS securities	97,345		97,345
U.S. governmental agency securities
Short-term AFS securities
Amortized cost, short-term AFS securities	53,842		53,842
Gross unrealized gains, short-term AFS securities	1		1
Gross unrealized losses, short-term AFS securities	(89)		(89)
Fair value, short-term AFS securities	53,754		53,754
Long-term AFS securities
Amortized cost, long-term AFS securities	97,431		97,431
Gross unrealized gains, long-term AFS securities	2		2
Gross unrealized losses, long-term AFS securities	(616)		(616)
Fair value, long-term AFS securities	96,817		96,817
Certificates of deposit
Short-term AFS securities
Amortized cost, short-term AFS securities	20,403		20,403
Gross unrealized gains, short-term AFS securities	0		0
Fair value, short-term AFS securities	20,403		20,403
Commercial paper
Short-term AFS securities
Amortized cost, short-term AFS securities	32,471		32,471
Gross unrealized gains, short-term AFS securities	0		0
Fair value, short-term AFS securities	$ 32,471		$ 32,471