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	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 30, 2012
Stock Options And Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Outstanding at beginning of period	2,744,057
Number of Shares, Granted	100,367
Number of Shares, Exercised	(82,854)
Number of Shares, Forfeited or expired	(23,383)
Number of Shares, Outstanding at end of period	2,738,187	2,744,057
Number of Shares, Vested and expected to vest	2,558,300
Number of Shares, Exercisable	2,141,920
Weighted-Average Exercise Price, Outstanding at beginning of period	$ 17.24
Weighted-Average Exercise Price, Granted	$ 12.23
Weighted-Average Exercise Price, Exercised	$ 12.03
Weighted-Average Exercise Price, Forfeited or expired	$ 12.24
Weighted-Average Exercise Price, Outstanding at end of period	$ 17.26	$ 17.24
Weighted-Average Exercise Price, Vested and expected to vest	$ 17.78
Weighted-Average Exercise Price, Exercisable	$ 19.28
Weighted-Average Remaining Contractual Term, Outstanding at beginning of period in years	5 years 0 months 4 days	5 years 0 months 4 days
Weighted-Average Remaining Contractual Term, Outstanding at end of period in years	5 years 0 months 4 days	5 years 0 months 4 days
Weighted-Average Remaining Contractual Term, Vested and expected to vest in years	4 years 8 months 16 days
Weighted-Average Remaining Contractual Term, Exercisable	3 years 9 months 29 days
Aggregate Intrinsic Value, Outstanding at beginning of period	$ 1,321
Aggregate Intrinsic Value, Outstanding at end of period	3,046	1,321
Aggregate Intrinsic Value, Vested and expected to vest	2,446
Aggregate Intrinsic Value, Exercisable	$ 1,113