Debt (Senior Notes) (Details)						3 Months Ended		9 Months Ended
	Jun. 09, 2015 USD ($)	Nov. 03, 2014 USD ($)	Aug. 15, 2014 USD ($)	Jan. 31, 2013 USD ($)	Jan. 17, 2006 USD ($)	Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)	Oct. 03, 2015 USD ($)	Sep. 27, 2014 USD ($)	Jun. 12, 2015	Jun. 09, 2015 EUR (€)
Debt Instrument [Line Items]
Increase in interest expense per quarter for .25% increase in notes per $100,000 of outstanding notes						$ 19,319,000	$ 34,786,000	$ 52,606,000	$ 77,584,000
3.85% Senior Notes Due February 1,2023 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debts				$ 600,000,000
Interest rate percentage				3.85%		3.85%		3.85%
Payment of financing costs				$ 6,000,000
6.125% Notes, Payable January 15, 2016 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debts					$ 900,000,000
Interest rate percentage					6.125%	6.125%		6.125%
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								$ 63,000
Incremental increase in outstanding notes					$ 100,000,000
Amount of debt repurchased		$ 54,400,000	$ 200,000,000
Price as a percentage of the principal amount debt repurchased		106.38%	107.73%
6.125% Notes, Payable January 15, 2016 [Member] | Interest Expense [Member]
Debt Instrument [Line Items]
Premium to tendering noteholders		$ 3,500,000	$ 15,450,000
Fees associated with cash tender			$ 1,080,000
2.00% Notes, Payable January 14, 2022 [Member]
Debt Instrument [Line Items]
Aggregate principal amount of debts | €											€ 500,000,000
Interest rate percentage						2.00%		2.00%		2.00%	2.00%
Payment of financing costs	$ 4,218,000