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Debt Debt (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Feb. 29, 2016
Mar. 27, 2016
Mar. 27, 2016
Sep. 27, 2015
Debt Instrument [Line Items]        
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 27, 2016, we were in compliance with all applicable covenants.    
Commercial Paper [Member]        
Short-term Debt [Line Items]        
Maximum allowable amount under Commercial Paper Program   $ 1,000.0 $ 1,000.0  
Outstanding commercial paper   $ 149.1 $ 149.1  
Weighted average interest rate on short-term debt   0.60% 0.60%  
Maximum [Member] | Commercial Paper [Member]        
Short-term Debt [Line Items]        
Maximum allowable maturity period of credit under Commercial Paper Program     397 days  
Two Point One Percentage Senior Notes [Member]        
Debt Instrument [Line Items]        
Debt Instrument, Issuance Date Feb. 04, 2016      
Debt Instrument, Face Value   $ 500.0 $ 500.0 $ 0.0
Stated Interest Rate   2.10% 2.10%  
Debt Instrument, Maturity Feb. 04, 2021