Stock Plans (Summary of Stock Option Activity) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	6 Months Ended
	Jun. 29, 2014
Stock option activity
Number of Shares, Outstanding at beginning of period	3,494
Number of Shares, Granted	511
Number of Shares, Exercised	(814)
Number of Shares, Canceled	(4)
Number of Shares, Forfeited	(44)
Number of Shares, Outstanding at end of period	3,143
Number of Shares, Exercisable at end of period	2,108
Number of Shares, Vested and expected to vest in the future	3,099
Weighted-Average Price, Outstanding at beginning of period	$ 23.34
Weighted-Average Price, Granted	$ 43.06
Weighted-Average Price, Exercised	$ 23.89
Weighted-Average Price, Canceled	$ 20.97
Weighted-Average Price, Forfeited	$ 33.70
Weighted-Average Price, Outstanding at end of period	$ 26.26
Weighted-Average Price, Exercisable at end of period	$ 21.40
Weighted-Average Price, Vested and expected to vest in the future	$ 26.15
Weighted-Average Remaining Contractual Term in Years, Outstanding at end of period	3 years 11 months
Weighted-Average Remaining Contractual Term in Years, Exercisable at end of period	2 years 11 months
Weighted-Average Remaining Contractual Term in Years, Vested and expected to vest in the future	3 years 11 months
Total Intrinsic Value, Outstanding at end of period	$ 58.5
Total Intrinsic Value, Exercisable at end of period	49.5
Total Intrinsic Value, Vested and expected to vest in the future	$ 58.0