Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 27, 2015	Dec. 28, 2014
Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	$ 507,639	$ 636,743
Long-term marketable securities	291,136	167,820
Debt Securities \| US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	184,278	238,488
Long-term marketable securities	20,769	0
Debt Securities \| Corporate Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	185,561	208,346
Long-term marketable securities	119,784	71,191
Debt Securities \| US Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	65,222	32,009
Long-term marketable securities	150,583	95,204
Debt Securities \| Municipal Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	1,363	13,622
Long-term marketable securities	0	1,425
Debt Securities \| Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	60,244	109,293
Debt Securities \| Commercial Paper
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	$ 10,971	$ 34,985
Short-term Marketable Securities \| Minimum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	1 month
Short-term Marketable Securities \| Maximum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	12 months
Long-term Marketable Securities [Member] \| Minimum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	13 months
Long-term Marketable Securities [Member] \| Maximum [Member]
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	35 months

Held-to-maturity Securities, Term

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle.

+ 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=49167202&loc=d3e26626-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

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Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity, not expected to be converted to cash, sold or exchanged within one year or the normal 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 (c)
-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26626-111562

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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.

+ References

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