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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		6 Months Ended
	Oct. 26, 2012	Oct. 28, 2011	Oct. 26, 2012	Oct. 28, 2011
Foreign Exchange Forward Purchase Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Gain (Loss) Recognized in AOCI	$ (5.5)	$ 5.9	$ 0.9	$ 10.3
Gain (Loss) Reclassified from AOCI into Income	$ (2.6)	$ 5.8	$ 1.9	$ 7.6

- 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.

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- 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