Fair Value (Details) - USD ($) $ in Thousands	Dec. 28, 2019	Dec. 29, 2018
Assets
Marketable equity securities	$ 4,600	$ 3,887
Securities held in NQDC trust	34,096	27,767
Foreign currency exchange contracts	3,557	101
Total Assets	488,195	359,596
Money market funds [Member]
Assets
Money market funds	445,942	327,841
Fair Value Measurements, Level 1 [Member]
Assets
Marketable equity securities	4,600	3,887
Securities held in NQDC trust	34,096	27,767
Foreign currency exchange contracts	0	0
Total Assets	484,638	359,495
Fair Value Measurements, Level 1 [Member] \| Money market funds [Member]
Assets
Money market funds	445,942	327,841
Fair Value Measurements, Level 2 [Member]
Assets
Marketable equity securities	0	0
Securities held in NQDC trust	0	0
Foreign currency exchange contracts	3,557	101
Total Assets	3,557	101
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
-Subparagraph (a)
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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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