Stock-Based Compensation (Stock Option Activity Under The Principal Option Plans) (Details) (Stock Options And Awards [Member], USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended
	Sep. 25, 2011 years
Stock Options And Awards [Member]
Number of Shares, Outstanding at beginning of period	2,745,796
Number of Shares, Granted	93,144
Number of Shares, Exercised	(127,271)
Number of Shares, Forfeited or expired	(64,633)
Number of Shares, Outstanding at end of period	2,647,036
Number of Shares, Vested and expected to vest	2,614,642
Number of Shares, Exercisable	2,164,386
Weighted-Average Exercise Price, Outstanding at beginning of period	$ 19.11
Weighted-Average Exercise Price, Granted	$ 21.91
Weighted-Average Exercise Price, Exercised	$ 12.40
Weighted-Average Exercise Price, Forfeited or expired	$ 18.32
Weighted-Average Exercise Price, Outstanding at end of period	$ 19.55
Weighted-Average Exercise Price, Vested and expected to vest	$ 19.55
Weighted-Average Exercise Price, Exercisable	$ 19.63
Weighted-Average Remaining Contractual Term, Outstanding at beginning of period in years	5.32
Weighted-Average Remaining Contractual Term, Outstanding at end of period in years	4.70
Weighted-Average Remaining Contractual Term, Vested and expected to vest in years	4.65
Weighted-Average Remaining Contractual Term, Exercisable	4.07
Aggregate Intrinsic Value, Outstanding at beginning of period	$ 8,731
Aggregate Intrinsic Value, Outstanding at end of period	899
Aggregate Intrinsic Value, Vested and expected to vest	893
Aggregate Intrinsic Value, Exercisable	$ 634