Debt (Senior Notes) (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended		0 Months Ended		9 Months Ended			3 Months Ended
	Sep. 25, 2013	Sep. 27, 2014	Sep. 28, 2013	Sep. 27, 2014	Sep. 28, 2013	Jan. 31, 2013 3.85% Senior Notes Due February 1,2023 [Member]	Sep. 27, 2014 3.85% Senior Notes Due February 1,2023 [Member]	Aug. 15, 2014 6.125% Notes, Payable January 15, 2016 [Member]	Jan. 17, 2006 6.125% Notes, Payable January 15, 2016 [Member]	Sep. 28, 2013 6.125% Notes, Payable January 15, 2016 [Member]	Sep. 27, 2014 6.125% Notes, Payable January 15, 2016 [Member]	Aug. 15, 2014 6.125% Notes, Payable January 15, 2016 [Member]	Sep. 27, 2014 6.125% Notes, Payable January 15, 2016 [Member] Interest Expense [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debts						$ 600,000,000			$ 900,000,000
Interest rate percentage						3.85%	3.85%		6.125%		6.125%
Payment of financing costs	1,836,000					6,000,000
Senior notes due date									Jan. 15, 2016
Increase in interest rate from rating agency downgrade										0.25%
Maximum increase in interest rate per agency from rating agency downgrade										1.00%
Increase in interest expense per quarter for .25% increase in notes per $100,000 of outstanding notes		34,786,000	25,630,000	77,584,000	70,098,000					63,000
Incremental increase in outstanding notes									100,000,000
Amount of debt repurchased												200,000,000
Price as a percentage of the principal amount debt repurchased								107.73%
Premium to tendering noteholders													15,450,000
Fees associated with cash tender													$ 1,080,000