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Stock Plans (Summary of Stock Option Activity) (Details) (USD $)
In Millions, except Share data in Thousands, unless otherwise specified
3 Months Ended
Apr. 01, 2012
years
Stock option activity  
Number of Shares, Outstanding at January 1, 2012 5,346
Number of Shares, Granted 686
Number of Shares, Exercised (521)
Number of Shares, Canceled (203)
Number of Shares, Forfeited (4)
Number of Shares, Outstanding at April 1, 2012 5,304
Number of Shares, Exercisable at April 1, 2012 3,655
Number of Shares, Vested and expected to vest in the future 4,843
Weighted-Average Price, Outstanding at January 1, 2012 $ 20.57
Weighted-Average Price, Granted $ 26.15
Weighted-Average Price, Exercised $ 18.22
Weighted-Average Price, Canceled $ 22.21
Weighted-Average Price, Forfeited $ 12.95
Weighted-Average Price, Outstanding at April 1, 2012 $ 21.46
Weighted-Average Price, Exercisable at April 1, 2012 $ 20.28
Weighted-Average Price, Vested and expected to vest in the future $ 21.46
Weighted-Average Remaining Contractual Term in Years, Outstanding at April 1, 2012 4.0
Weighted-Average Remaining Contractual Term in Years, Exercisable at April 1, 2012 3.0
Weighted-Average Remaining Contractual Term in Years, Vested and expected to vest in the future 4.0
Total Intrinsic Value, Outstanding at April 1, 2012 $ 22.5
Total Intrinsic Value, Exercisable at April 1, 2012 19.2
Total Intrinsic Value, Vested and expected to vest in the future $ 20.5