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Stockholders' Equity (Reconciliation of basic to diluted weighted average shares) (Detail) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Sep. 30, 2017
Oct. 01, 2016
Disclosure Reconciliation Of Basic To Diluted Weighted Average Shares [Abstract]        
Basic weighted average shares outstanding 366,083 379,368 368,885 382,235
Effect of potentially dilutive securities:        
Stock options 1,541 1,890 1,591 2,016
Restricted stock units 535 1,293 470 1,210
Employee stock purchase plan and other 1 7 1 17
Diluted weighted average shares outstanding 368,160 382,558 370,947 385,478