Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 25, 2011	Sep. 30, 2012	Sep. 25, 2011
Earnings Per Share (Thousands of Dollars and Shares Except Per Share Data) [Abstract]
Net earnings (in dollars)	$ 164,852	$ 170,990	$ 205,700	$ 246,237
Basic [Abstract]
Average shares outstanding (in shares)	130,619	132,448	130,146	135,388
Equivalent shares (basic) (in shares)	130,619	132,448	130,146	135,388
Net earnings per common share-basic (in dollars per share)	$ 1.26	$ 1.29	$ 1.58	$ 1.82
Diluted [Abstract]
Average shares outstanding (in shares)	130,619	132,448	130,146	135,388
Effect of dilutive securities:
Options and other share-based awards (in shares)	1,864	2,476	1,893	2,985
Equivalent shares (diluted) (in shares)	132,483	134,924	132,039	138,373
Net earnings per common share-diluted (in dollars per share)	$ 1.24	$ 1.27	$ 1.56	$ 1.78
Options to acquire shares totaling excluded as antidilutive	3,478	1,851	3,508	1,394