Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 25, 2016	Dec. 27, 2015
Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	$ 449,535	$ 507,639
Long-term marketable securities	187,299	291,136
Debt Securities \| US Treasury Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	150,623	184,278
Long-term marketable securities	14,792	20,769
Debt Securities \| Corporate Debt Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	150,599	185,561
Long-term marketable securities	61,775	119,784
Debt Securities \| US Governmental Agency Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	64,135	65,222
Long-term marketable securities	110,732	150,583
Debt Securities \| Municipal Securities
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	0	1,363
Debt Securities \| Certificates of Deposit
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	0	60,244
Debt Securities \| Commercial Paper
Schedule of Held-to-maturity Securities [Line Items]
Short-term marketable securities	$ 84,178	$ 10,971
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	34 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=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

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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=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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