Stockholders' Equity and Earnings per Share (Details) (USD $)	1 Months Ended		3 Months Ended			1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended
	May 31, 2011	Nov. 30, 2010	Dec. 30, 2011	Dec. 31, 2011	Dec. 31, 2010	Nov. 30, 2009 November 2009 Share Repurchase Program Member [Member]	Dec. 31, 2010 November 2009 Share Repurchase Program Member [Member]	Sep. 30, 2010 September 2010 Share Repurchase Program [Member]	Dec. 31, 2010 September 2010 Share Repurchase Program [Member]	Aug. 31, 2011 August 2011 Share Repurchase Program [Member]	Dec. 31, 2011 August 2011 Share Repurchase Program [Member]
Stockholders' Equity and Earnings per Share (Details) [Abstract]
Net income				$ 162,116,000	$ 160,500,000
Other Comprehensive Income (Loss), Net of Tax				6,487,000	6,702,000
Comprehensive Income				168,603,000	167,202,000
Dividend Increase Percentage	15.00%	25.00%		13.00%
Dividends Declared	0.115	0.10		0.13
Basic				258,461,000	275,605,000
Incremental Common Shares Attributable To Share Based Payment Arrangements				4,623,000	5,088,000
Diluted				263,084,000	280,693,000
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount				3,200,000	3,500,000
Treasury Stock Purchase Programs [Line Items]
Stock Repurchase Program, Authorized Amount						500,000,000		500,000,000		750,000,000
Treasury Stock Value Acquired Cost Method							$ 98,100,000		$ 87,100,000		$ 119,900,000
Treasury Stock, Shares, Acquired							3,200,000		2,800,000		3,300,000
Treasury Stock, Shares, Retired			238,800,000