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Stockholders' Equity (Reconciliation of basic to diluted weighted average shares) (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jul. 01, 2017
Jun. 30, 2018
Jul. 01, 2017
Disclosure Reconciliation Of Basic To Diluted Weighted Average Shares [Abstract]        
Basic weighted average shares outstanding 362,011 365,911 361,944 370,075
Effect of potentially dilutive securities:        
Stock options 876 1,565 968 1,605
Restricted stock units 367 515 333 466
Employee stock purchase plan and other 0 1 0 1
Diluted weighted average shares outstanding 363,254 367,992 363,245 372,147