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Fair Value (Schedule Of Financial Instruments Measured At Fair Value On Recurring Basis) (Details) - USD ($)
$ in Millions
Dec. 30, 2016
Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Contingent consideration $ 10.7  
Fair Value, Measurements, Recurring [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 574.0 $ 408.7
Auction rate security 0.0 2.3
Total 574.0 411.0
Contingent consideration 16.9 7.9
Total 16.9 7.9
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 574.0 408.7
Auction rate security 0.0 0.0
Total 574.0 408.7
Contingent consideration 0.0 0.0
Total 0.0 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0.0 0.0
Auction rate security 0.0 0.0
Total 0.0 0.0
Contingent consideration 0.0 0.0
Total 0.0 0.0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0.0 0.0
Auction rate security 0.0 2.3
Total 0.0 2.3
Contingent consideration 16.9 7.9
Total $ 16.9 $ 7.9