Stock Plans (Summary of Stock Option Activity) (Details) (USD $) In Millions, except Share data in Thousands, unless otherwise specified	9 Months Ended
	Oct. 02, 2011 years segments days
Stock option activity
Number of Shares, Outstanding at January 2, 2011	6,983
Number of Shares, Granted	582
Number of Shares, Exercised	(1,133)
Number of Shares, Canceled	(1,219)
Number of Shares, Forfeited	(107)
Number of Shares, Outstanding at October 2, 2011	5,106
Number of Shares, Exercisable at October 2, 2011	3,566
Number of Shares, Vested and expected to vest in the future	4,644
Weighted-Average Price, Outstanding at January 2, 2011	$ 21.86
Weighted-Average Price, Granted	$ 26.74
Weighted-Average Price, Exercised	$ 20.90
Weighted-Average Price, Canceled	$ 30.40
Weighted-Average Price, Forfeited	$ 18.40
Weighted-Average Price, Outstanding at October 2, 2011	$ 20.67
Weighted-Average Price, Exercisable at October 2, 2011	$ 20.75
Weighted-Average Price, Vested and expected to vest in the future	$ 20.67
Weighted-Average Remaining Contractual Term in Years, Outstanding at October 2, 2011	3.6
Weighted-Average Remaining Contractual Term in Years, Exercisable at October 2, 2011	2.9
Weighted-Average Remaining Contractual Term in Years, Vested and expected to vest in the future	3.6
Total Intrinsic Value, Outstanding at October 2, 2011	$ 16.2
Total Intrinsic Value, Exercisable at October 2, 2011	10.3
Total Intrinsic Value, Vested and expected to vest in the future	$ 14.7