Fair Value (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Dec. 28, 2019
Short-term investments:
Marketable equity securities	$ 4,164	$ 4,600
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	32,312	34,096
Foreign currency exchange contracts	4,694	3,557
Total Assets	750,731	488,195
Money Market Funds
Assets
Cash equivalents	709,561	445,942
Fair Value Measurements, Level 1 [Member]
Short-term investments:
Marketable equity securities	4,164	4,600
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	32,312	34,096
Foreign currency exchange contracts	0	0
Total Assets	746,037	484,638
Fair Value Measurements, Level 1 [Member] \| Money Market Funds
Assets
Cash equivalents	709,561	445,942
Fair Value Measurements, Level 2 [Member]
Short-term investments:
Marketable equity securities	0	0
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	0	0
Foreign currency exchange contracts	4,694	3,557
Total Assets	4,694	3,557
Fair Value Measurements, Level 2 [Member] \| Money Market Funds
Assets
Cash equivalents	0	0
Fair Value Measurements, Level 3 [Member]
Short-term investments:
Marketable equity securities	0	0
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	0	0
Foreign currency exchange contracts	0	0
Total Assets	0	0
Fair Value Measurements, Level 3 [Member] \| Money Market Funds
Assets
Cash equivalents	$ 0	$ 0

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

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

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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).

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-Publisher FASB
-Name Accounting Standards Codification
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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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