Debt And Bank Credit Facilities (Details Of The Senior Notes) (Details) (USD $) In Thousands, unless otherwise specified				12 Months Ended
	Dec. 31, 2011	Jan. 01, 2011	Jan. 02, 2010	Dec. 31, 2011 Floating Rate Series 2007A Mature In August 2014 [Member]		Dec. 31, 2011 Floating Rate Series 2007A Mature In August 2017 [Member]		Dec. 31, 2011 Fixed Rate Series 2011A Mature In July 2018 [Member]	Dec. 31, 2011 Fixed Rate Series 2011A Mature In July 2021 [Member]	Dec. 31, 2011 Fixed Rate Series 2011A Mature In July 2023 [Member]	Dec. 31, 2011 Maximum [Member]	Dec. 31, 2011 Minimum [Member]
Debt Instrument [Line Items]
Senior notes	$ 750,000	$ 250,000		$ 150,000		$ 100,000		$ 100,000	$ 230,000	$ 170,000
Variable rate terms				Floating	[1]	Floating	[1]
Stated rate, minimum									4.80%	4.90%
Stated rate, maximum									5.00%	5.10%
Debt instrument interest rate			5.60%					4.10%
Spread on variable interest rate											1.20%	1.10%
Maturity date				Aug. 01, 2014		Aug. 01, 2017		Jul. 01, 2018	Jul. 01, 2021	Jul. 01, 2023

[1] Interest rates vary as LIBOR varies. At December 31, 2011, the interest rate was between 1.1 and 1.2%.