Quarterly report pursuant to Section 13 or 15(d)

Common Stock and Employee Equity Plans (Schedule of Common Shares Outstanding) (Details)

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Common Stock and Employee Equity Plans (Schedule of Common Shares Outstanding) (Details) - shares
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Sep. 26, 2020
Sep. 28, 2019
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance, beginning of period (in shares)     1,175,000  
Balance, end of period (in shares) 1,208,000   1,208,000  
Common stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance, beginning of period (in shares) 1,174,000 1,086,000 1,170,000 1,005,000
Common stock issued under employee equity plans (in shares) 9,000 12,000 13,000 17,000
Common stock repurchased for tax withholding on equity awards (in shares) (1,000) 0 (1,000) 0
Issuance of common stock upon warrant exercise (in shares) 0 0 0 75,000
Issuance of common stock to settle convertible debt (in shares) 20,000 16,000 20,000 16,000
Balance, end of period (in shares) 1,202,000 1,114,000 1,202,000 1,114,000
Treasury stock        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of treasury stock to partially settle debt (in shares) 0 0 0 1,000