Stockholders' Equity (Combined Activity Under Stock Option Plans And Agreements) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	6 Months Ended
	Oct. 28, 2011
Stockholders' Equity [Abstract]
Beginning balance, Number of Shares	24.5
Beginning balance, Weighted-Average Exercise Price	$ 26.62
Options granted, Numbers of Shares	2.0
Options granted, Weighted-Average Exercise Price	$ 51.71
Options exercised, Number of Shares	(1.8)
Options exercised, Weighted-Average Exercise Price	$ 22.86
Options forfeitures and cancellations, Number of Shares	(0.3)
Options forfeitures and cancellations, Weighted-Average Exercise Price	$ 31.44
Ending balance, Number of Shares	24.4
Ending balance, Weighted-Average Exercise Price	$ 28.92
Outstanding, Weighted-Average Remaining Contractual Term (Years)	4.10
Outstanding, Aggregate Intrinsic Value	$ 349.3
Options vested and expected to vest, Number of Shares	23.4
Options vested and expected to vest, Weighted-Average Exercise Price	$ 28.43
Options vested and expected to vest, Weighted-Average Remaining Contractual Term (Years)	4.03
Options vested and expected to vest, Aggregate Intrinsic Value	342.8
Exercisable, Number of Shares	14.9
Exercisable, Weighted-Average Exercise Price	$ 24.79
Exercisable, Weighted-Average Remaining Contractual Term (Years)	3.31
Exercisable, Aggregate Intrinsic Value	$ 255.2