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Derivatives And Hedging Activities (Schedule Of Notional Value Of Outstanding Foreign Currency Forward Contracts) (Details) (USD $)
In Millions, unless otherwise specified
Jan. 27, 2012
Apr. 29, 2011
Euro [Member]
   
Derivative [Line Items]    
Cash Flow Hedges $ 147.9 $ 104.0
Balance Sheet Contracts 256.3 253.7
British Pound Sterling [Member]
   
Derivative [Line Items]    
Cash Flow Hedges 36.5 20.9
Balance Sheet Contracts 45.4 70.8
Australian Dollar [Member]
   
Derivative [Line Items]    
Balance Sheet Contracts 39.8 34.4
Canadian Dollar [Member]
   
Derivative [Line Items]    
Balance Sheet Contracts 22.9 56.0
Other [Member]
   
Derivative [Line Items]    
Balance Sheet Contracts $ 63.6 $ 52.6