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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 28, 2018	Jan. 03, 2020	Dec. 28, 2018	Dec. 31, 2017	Dec. 30, 2016
Income Tax Examination [Line Items]
Valuation allowance	$ 58,112	$ 61,659	$ 58,112
Valuation allowance increase (decrease)	244,100	3,500	(360,800)
Unrecognized tax benefits	$ 76,060	79,078	$ 76,060	$ 79,342	$ 61,809
Unrecognized tax benefits that would reduce income tax provision and effective tax rate		48,100
Federal
Income Tax Examination [Line Items]
Net operating loss carryforwards		225,000
Operating loss carryforwards with expiration dates		203,000
Research and development tax credits		112,000
State and Local Jurisdiction
Income Tax Examination [Line Items]
Net operating loss carryforwards		450,000
State and Local Jurisdiction | Research Tax Credit Carryforward
Income Tax Examination [Line Items]
Research and development tax credits		$ 38,000

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