Income Taxes (Schedule Of Difference Between The Tax Provision At The Statutory Federal Income Tax Rate And The Tax Provision As A Percentage Of Income Before Taxes (Effective Tax Rate)) (Details)	12 Months Ended
Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Income Tax Disclosure [Abstract]
Statutory federal income tax rate	21.00%	35.00%	35.00%
Foreign income taxed at different rates	(7.00%)	(15.00%)	(10.00%)
US State income taxes	1.00%	1.00%	2.00%
US Federal research and development credits	(4.00%)	(3.00%)	(3.00%)
Stock-based compensation	1.00%	2.00%	3.00%
Excess tax benefit related to stock-based compensation	(3.00%)	(4.00%)
Effect of U.S. tax law change	(8.00%)	33.00%
Other US taxes on foreign operations	2.00%
Tax reserve releases	(9.00%)
Divestiture	0.00%	0.00%	(5.00%)
Other	4.00%	3.00%	3.00%
Effective tax rate	(2.00%)	52.00%	25.00%

Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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