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Provision For (Benefit From) Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 01, 2021
Jan. 03, 2020
Dec. 28, 2018
Dec. 31, 2017
Income Tax Examination [Line Items]        
Valuation allowance $ 67,185 $ 61,659    
Valuation allowance increase (decrease) (5,500) (3,500)    
Unrecognized tax benefits 80,941 $ 79,078 $ 76,060 $ 79,342
Unrecognized tax benefits that would reduce income tax provision and effective tax rate 50,100      
Federal        
Income Tax Examination [Line Items]        
Net operating loss carryforwards 92,600      
Research and development tax credits 127,400      
State and Local Jurisdiction        
Income Tax Examination [Line Items]        
Net operating loss carryforwards 427,900      
State and Local Jurisdiction | Research Tax Credit Carryforward        
Income Tax Examination [Line Items]        
Research and development tax credits 42,900      
Tax credit carryforward amount with expiration dates $ 1,600