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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 9 Months Ended
Jan. 25, 2013
Jan. 27, 2012
Jan. 25, 2013
Jan. 27, 2012
Foreign Exchange Forward Purchase Contracts
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain Recognized into Income $ 0 $ 10.7 $ 6.2 $ 24.9