Borrowings (Components Of Long-Term Debt) (Details) (USD $)	9 Months Ended
	Sep. 25, 2011	Mar. 31, 2011	Dec. 31, 2010
Line of Credit Facility [Line Items]
Long-term debt	$ 1,025,000,000		$ 965,800,000
Subtotal, Long-term debt	952,322,000		885,909,000
Less: Current portion of borrowings			(72,500,000)
Total long-term debt	952,322,000		813,409,000
Senior Credit Facility, Term Loan Facility, At An Average Rate Of 1.31%, Due 10/1/2012 [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility		36,100,000	36,123,000
Annual interest rate	1.31%
Debt maturity date	10/1/2012
Senior Credit Facility, Term Loan Facility, At An Average Rate Of 2.50%, Due 10/1/2014 [Member]
Line of Credit Facility [Line Items]
Senior Credit Facility	375,000,000		363,877,000
Annual interest rate	2.50%
Debt maturity date	10/1/2014
2004 Notes, 6.66% Series 2004-1 Tranche A Senior Notes Due 7/8/2011 [Member]
Line of Credit Facility [Line Items]
Senior notes			72,500,000
Annual interest rate	6.66%
Debt maturity date	7/8/2011
2004 Notes, 7.14% Series 2004-1 Tranche B Senior Notes Due 7/8/2014 [Member]
Line of Credit Facility [Line Items]
Senior notes			48,250,000
Annual interest rate	7.14%
Debt maturity date	7/8/2014
2004 Notes, 7.46% Series 2004-1 Tranche C Senior Notes Due 7/8/2016 [Member]
Line of Credit Facility [Line Items]
Senior notes			45,050,000
Annual interest rate	7.46%
Debt maturity date	7/8/2016
3.875% Convertible Senior Subordinated Notes Due 2017 [Member]
Line of Credit Facility [Line Items]
3.875% Convertible Senior Subordinated Notes due 2017	400,000,000		400,000,000
Less: Unamortized debt discount on 3.875% Convertible Senior Subordinated Notes due 2017	(72,678,000)		(79,891,000)
Annual interest rate	3.875%
Debt maturity date	2017
6.875% Senior Subordinated Notes Due 2019 [Member]
Line of Credit Facility [Line Items]
6.875% Senior Subordinated Notes due 2019	$ 250,000,000
Annual interest rate	6.875%
Debt maturity date	June 1, 2019