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Debt (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Aug. 31, 2007
Sep. 30, 2012
Oct. 02, 2011
Oct. 03, 2010
Debt Disclosure [Abstract]        
Unsecured credit facility   $ 500    
Amount of credit facility available for issuances of letters of credit   100    
Maturity date of credit facility   Nov. 30, 2014    
Maximum increase in commitment amount allowable under the credit facility   500    
Borrowings outstanding under credit facility   0 0  
Incremental interest rate over LIBOR   0.85%    
Maximum allowable aggregate amount outstanding under Commercial Paper Program   500    
Maximum allowable maturity period of credit under Commercial Paper Program   P397D    
Combined borrowing limit of Commercial Paper Program and Credit Facility   500    
Borrowings outstanding under commercial paper program   0 0  
Letters of credit outstanding   18 17  
Issuance date of 6.25% Senior Notes Aug. 31, 2007      
Face amount of long-term debt 550      
Interest rate of Senior Notes 6.25%      
Maturity date of 6.25% Senior Notes Aug. 31, 2017      
Carrying amount of 6.25% Senior Notes   549.6 549.5  
Interest expense, net of interest capitalized   32.7 33.3 32.7
Interest capitalized   $ 3.2 $ 4.4 $ 4.9