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Derivatives and Hedging Activities - Schedule of Derivative Instruments 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 in AOCI	$ 6.4	$ 4.4
Gain (Loss) Reclassified from AOCI into Income	$ 4.5	$ 1.8

- Definition

The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References+ Details

- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References+ Details