Earnings Per Share (Reconciliation Of The Average Number Of Common Shares Outstanding To Average Number Of Diluted Shares Outstanding) (Details)	3 Months Ended
	Mar. 31, 2012	Mar. 26, 2011
Earnings Per Share [Abstract]
Average number of common shares outstanding	46,800,000	47,870,000
Incremental shares from assumed exercises of stock options	261,000	30,000
Average number of common shares and common share equivalents outstanding	47,061,000	47,900,000
Common stock excluded from calculation of diluted earnings per share antidilutive		584,813