Earnings Per Share (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jul. 01, 2012	Apr. 01, 2012	Dec. 31, 2011	Sep. 25, 2011	Jun. 26, 2011	Mar. 27, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Income from continuing operations used in computing basic and diluted earnings per share	$ 70,600	$ 134,000	$ 247,300	$ 172,000	$ 54,600	$ 183,600	$ 190,600	$ 119,300	$ 623,925,000	$ 548,078,000	$ 259,669,000
Denominator for basic earnings per share-weighted-average common shares									227,119,000	232,889,000	233,312,000
Effect of dilutive securities - employee stock compensation plan									2,110,000	2,029,000	1,475,000
Denominator for diluted earnings per share-adjusted weighted-average shares outstanding									229,229,000	234,918,000	234,787,000
Basic	$ 0.31	$ 0.59	$ 1.08	$ 0.75	$ 0.24	$ 0.79	$ 0.81	$ 0.51	$ 2.75	$ 2.35	$ 1.11
Diluted	$ 0.31	$ 0.59	$ 1.07	$ 0.74	$ 0.24	$ 0.78	$ 0.81	$ 0.51	$ 2.72	$ 2.33	$ 1.11
Shares considered anti-dilutive and excluded from computation									2,100,000	3,800,000	4,200,000