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Derivatives And Hedging Activities (Schedule of Derivative Instruments Not Designated as Cash Flow Hedges) (Details) (Foreign Exchange Forward Purchase Contracts [Member], USD $)
In Millions, unless otherwise specified
12 Months Ended
Apr. 27, 2012
Apr. 29, 2011
Apr. 30, 2010
Foreign Exchange Forward Purchase Contracts [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (Loss) Recognized into Income $ 21.0 $ (20.6) $ 8.2