Fair Value (Details) - USD ($) $ in Thousands	Sep. 26, 2020	Dec. 28, 2019
Short-term investments:
Marketable equity securities	$ 4,570	$ 4,600
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	36,668	34,096
Foreign currency exchange contracts		3,557
Total Assets	891,886	488,195
Foreign currency exchange contracts	3,975
Total Liabilities	3,975
Money Market Funds
Assets
Cash equivalents	850,648	445,942
Fair Value Measurements, Level 1 [Member]
Short-term investments:
Marketable equity securities	4,570	4,600
Securities held in Non-Qualified Deferred Compensation trust, or NQDC	36,668	34,096
Foreign currency exchange contracts		0
Total Assets	891,886	484,638
Foreign currency exchange contracts	0
Total Liabilities	0
Fair Value Measurements, Level 1 [Member] \| Money Market Funds
Assets
Cash equivalents	850,648	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		3,557
Total Assets	0	3,557
Foreign currency exchange contracts	3,975
Total Liabilities	3,975
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
Total Assets	0	0
Foreign currency exchange contracts	0
Total Liabilities	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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-Publisher FASB
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