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Derivatives and Hedging Activities - Schedule of Derivative Instruments Not Designated as Cash Flow Hedges (Detail) (Foreign Exchange Forward Contracts, USD $)
In Millions, unless otherwise specified
3 Months Ended
Jul. 26, 2013
Jul. 27, 2012
Foreign Exchange Forward Contracts
   
Derivative Instruments, Gain (Loss) [Line Items]    
Gain Recognized into Income $ 0.2 $ 15.9