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Stock Plans (Summary of Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Millions
9 Months Ended
Oct. 02, 2016
USD ($)
$ / shares
shares
Stock option activity  
Number of Shares, Outstanding at beginning of period | shares 2,372
Number of Shares, Granted | shares 594
Number of Shares, Exercised | shares (512)
Number of Shares, Canceled | shares (1)
Number of Shares, Forfeited | shares (93)
Number of Shares, Outstanding at end of period | shares 2,360
Number of Shares, Exercisable at end of period | shares 1,401
Weighted-Average Price, Outstanding at beginning of period | $ / shares $ 33.12
Weighted-Average Price, Granted | $ / shares 44.65
Weighted-Average Price, Exercised | $ / shares 23.58
Weighted-Average Price, Canceled | $ / shares 12.95
Weighted-Average Price, Forfeited | $ / shares 45.03
Weighted-Average Price, Outstanding at end of period | $ / shares 37.64
Weighted-Average Price, Exercisable at end of period | $ / shares $ 32.61
Weighted-Average Remaining Contractual Term in Years, Outstanding at end of period 4 years
Weighted-Average Remaining Contractual Term in Years, Exercisable at end of period 2 years 9 months
Total Intrinsic Value, Outstanding at end of period | $ $ 40.0
Total Intrinsic Value, Exercisable at end of period | $ $ 30.8