Debt (Narrative) (Details) (USD $)	12 Months Ended					12 Months Ended
	Sep. 29, 2013	Sep. 30, 2012	Oct. 02, 2011	Sep. 29, 2013 2010 Credit Facility [Member]	Nov. 30, 2010 2010 Credit Facility [Member]	Sep. 29, 2013 2013 Credit Facility [Member]	Sep. 29, 2013 Eurodollar [Member] 2013 Credit Facility [Member]	Sep. 29, 2013 Base Rate [Member] 2013 Credit Facility [Member]	Sep. 29, 2013 Three Point Eight Five Percentage Senior Notes [Member]	Sep. 29, 2013 Six Point Two Five Percentage Senior Notes [Member]	Sep. 30, 2012 Six Point Two Five Percentage Senior Notes [Member]
Unsecured credit facility	$ 750,000,000				$ 500,000,000	$ 750,000,000
Maturity date of credit facility				Nov. 14, 2014		Feb. 05, 2018
Amount of credit facility available for issuances of letters of credit						150,000,000
Maximum increase in commitment amount allowable under the credit facility						750,000,000
Incremental interest rate over variable rate loans							0.795%	0.00%
Maximum allowable aggregate amount outstanding under Commercial Paper Program	1,000,000,000
Maximum allowable maturity period of credit under Commercial Paper Program	397 days
Combined borrowing limit of Commercial Paper Program and Credit Facility	729,000,000
Letters of credit outstanding	21,000,000	18,000,000
Borrowings outstanding under commercial paper program	0	0
Issuance date of Senior Notes									Sep. 06, 2013	Aug. 15, 2007
Face amount of long-term debt									750,000,000	550,000,000
Interest rate of Senior Notes									3.85%	6.25%
Maturity date of Senior Notes									Oct. 01, 2023	Aug. 31, 2017
Effective borrowing cost of 3.85% Senior Notes									2.86%
Carrying amount of Senior Notes									749,800,000	549,700,000	549,600,000
Debt instrument, covenant compliance	The indentures under which the 2013 notes and the 2007 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 September 29, 2013 and September 30, 2012, we were in compliance with each of these covenants.
Interest expense, net of interest capitalized	28,100,000	32,700,000	33,300,000
Interest capitalized	$ 10,400,000	$ 3,200,000	$ 4,400,000