Marketable Securities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 26, 2017	Dec. 25, 2016
Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	$ 392,249	$ 449,535
Long-term marketable securities	209,331	187,299
Debt Securities \| US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	123,547	150,623
Long-term marketable securities	40,842	14,792
Debt Securities \| Corporate Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	154,255	150,599
Long-term marketable securities	52,799	61,775
Debt Securities \| U.S. governmental agency securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	56,079	64,135
Long-term marketable securities	115,690	110,732
Debt Securities \| Commercial Paper
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	$ 58,368	$ 84,178
Short-term Marketable Securities \| Minimum
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	1 month
Short-term Marketable Securities \| Maximum
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	12 months
Long-term Marketable Securities \| Minimum
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	13 months
Long-term Marketable Securities \| Maximum
Schedule of Held-to-maturity Securities [Line Items]
Term of investments	36 months

Held-to-maturity Securities, Term

No definition available.

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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=66010992&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=65884222&loc=d3e22054-111558

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- Definition

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=65884222&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=66010992&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

No definition available.

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