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Derivatives and Hedging Activities - Schedule of Derivative Instruments Not Designated as Cash Flow Hedges (Detail) (Foreign Exchange Forward Purchase Contracts, USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 27, 2012
Jul. 29, 2011
Foreign Exchange Forward Purchase Contracts
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) Recognized into Income $ 15.9 $ 6.0