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

+ References

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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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No definition available.

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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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- Definition

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

+ References

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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-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 Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 25, 2016	Dec. 27, 2015
Schedule of Available-for-sale Securities [Line Items]
Net unrealized loss in other comprehensive income	$ 2,545	$ 0	$ 0
Short-term AFS securities
Amortized cost, short-term AFS securities	309,029
Gross unrealized gains, short-term AFS securities	0
Gross unrealized losses, short-term AFS securities	(440)
Fair value, short-term AFS securities	308,589
Long-term AFS securities
Amortized cost, long-term marketable securities	243,516
Gross unrealized gains, long-term marketable securities	0
Gross unrealized losses, long-term marketable securities	(2,105)
Fair value, long-term marketable securities	241,411
US Treasury Securities [Member]
Short-term AFS securities
Amortized cost, short-term AFS securities	70,985
Gross unrealized gains, short-term AFS securities	0
Gross unrealized losses, short-term AFS securities	(34)
Fair value, short-term AFS securities	70,951
Long-term AFS securities
Amortized cost, long-term marketable securities	53,031
Gross unrealized gains, long-term marketable securities	0
Gross unrealized losses, long-term marketable securities	(403)
Fair value, long-term marketable securities	52,628
Corporate Debt Securities [Member]
Short-term AFS securities
Amortized cost, short-term AFS securities	150,334
Gross unrealized gains, short-term AFS securities	0
Gross unrealized losses, short-term AFS securities	(227)
Fair value, short-term AFS securities	150,107
Long-term AFS securities
Amortized cost, long-term marketable securities	92,687
Gross unrealized gains, long-term marketable securities	0
Gross unrealized losses, long-term marketable securities	(683)
Fair value, long-term marketable securities	92,004
US Government Agencies Securities [Member]
Short-term AFS securities
Amortized cost, short-term AFS securities	45,819
Gross unrealized gains, short-term AFS securities	0
Gross unrealized losses, short-term AFS securities	(179)
Fair value, short-term AFS securities	45,640
Long-term AFS securities
Amortized cost, long-term marketable securities	97,798
Gross unrealized gains, long-term marketable securities	0
Gross unrealized losses, long-term marketable securities	(1,019)
Fair value, long-term marketable securities	96,779
Certificates of Deposit [Member]
Short-term AFS securities
Amortized cost, short-term AFS securities	9,300
Gross unrealized gains, short-term AFS securities	0
Fair value, short-term AFS securities	9,300
Commercial Paper [Member]
Short-term AFS securities
Amortized cost, short-term AFS securities	32,591
Gross unrealized gains, short-term AFS securities	0
Fair value, short-term AFS securities	$ 32,591