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Stockholders' Equity (Reconciliation of basic to diluted weighted average shares) (Detail) - shares
shares in Thousands
3 Months Ended
Mar. 31, 2018
Apr. 01, 2017
Disclosure Reconciliation Of Basic To Diluted Weighted Average Shares [Abstract]    
Basic weighted average shares outstanding 361,882 373,218
Effect of potentially dilutive securities:    
Stock options 1,067 1,640
Restricted stock units 335 385
Employee stock purchase plan and other 7 8
Diluted weighted average shares outstanding 363,291 375,251