Fair Value (Details) - USD ($) $ in Thousands	Dec. 29, 2018	Dec. 30, 2017
Assets
Marketable equity securities	$ 3,887	$ 4,455
Securities held in NQDC trust	27,767	31,473
Foreign currency exchange contracts	101	2,937
Total Assets	359,596	542,799
Money market funds [Member]
Assets
Money market funds	327,841	503,934
Fair Value Measurements, Level 1 [Member]
Assets
Marketable equity securities	3,887	4,455
Securities held in NQDC trust	27,767	31,473
Foreign currency exchange contracts	0	0
Total Assets	359,495	539,862
Fair Value Measurements, Level 1 [Member] \| Money market funds [Member]
Assets
Money market funds	327,841	503,934
Fair Value Measurements, Level 2 [Member]
Assets
Marketable equity securities	0	0
Securities held in NQDC trust	0	0
Foreign currency exchange contracts	101	2,937
Total Assets	101	2,937
Fair Value Measurements, Level 2 [Member] \| Money market funds [Member]
Assets
Money market funds	0	0
Fair Value Measurements, Level 3 [Member]
Assets
Marketable equity securities	0	0
Securities held in NQDC trust	0	0
Foreign currency exchange contracts	0	0
Total Assets	0	0
Fair Value Measurements, Level 3 [Member] \| Money market funds [Member]
Assets
Money market funds	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.17)
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740

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Fair value portion of asset contracts related to the exchange of different currencies, including, but not limited to, foreign currency options, forward contracts, and swaps.

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