Debt (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	1 Months Ended			1 Months Ended
	Mar. 30, 2014	Dec. 29, 2013 Point Eight Seven Five Percentage Senior Notes [Member]	Mar. 30, 2014 Point Eight Seven Five Percentage Senior Notes [Member]	Sep. 29, 2013 Point Eight Seven Five Percentage Senior Notes [Member]	Dec. 29, 2013 Two Point Zero Percentage Senior Notes [Member]	Mar. 30, 2014 Two Point Zero Percentage Senior Notes [Member]	Sep. 29, 2013 Two Point Zero Percentage Senior Notes [Member]
Issuance date of Senior Notes		Dec. 02, 2013			Dec. 02, 2013
Face amount of Senior Notes		$ 400.0	$ 400.0	$ 0	$ 350.0	$ 350.0	$ 0
Stated interest rate of Senior Notes		0.875%	0.875%		2.00%	2.00%
Maturity date of Senior Notes		Dec. 05, 2016			Dec. 05, 2018
Long-term debt covenant compliance	The indentures under which the above notes were issued also require us to maintain compliance with certain covenants, including limits on future liens and sale and leaseback transactions on certain material properties. As of March 30, 2014, we were in compliance with each of these covenants.