Stockholders' Equity (Combined Activity Under Stock Option Plans And Agreements) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 27, 2012	Apr. 29, 2011	Apr. 30, 2010
Stockholders' Equity [Abstract]
Beginning balance, Number of Shares	24.5	35.2	66.1
Beginning balance, Weighted-Average Exercise Price	$ 26.62	$ 23.02	$ 29.27
Options granted, Numbers of Shares	2.2	3.9	7.1
Options granted, Weighted-Average Exercise Price	$ 50.65	$ 45.28	$ 26.95
Options exercised, Number of Shares	(5.2)	(13.8)	(8.5)
Options exercised, Weighted-Average Exercise Price	$ 21.54	$ 21.85	$ 19.33
Options cancelled in the Exchange, Number of Shares			(24.5)
Options cancelled in the Exchange, weighted average exercise price			$ 39.05
Options forfeitures and cancellations, Number of Shares	(0.9)	(1.0)	(5.0)
Options forfeitures and cancellations, Weighted-Average Exercise Price	$ 37.23	$ 34.43	$ 39.12
Options assumed in acquisition, Number of Shares		0.2
Options assumed in acquisition, Weighted-Average Exercise Price		$ 16.56
Ending balance, Number of Shares	20.6	24.5	35.2
Ending balance, Weighted-Average Exercise Price	$ 29.98	$ 26.62	$ 23.02
Outstanding, Weighted-Average Remaining Contractual Term	3 years 9 months 22 days
Outstanding, Aggregate Intrinsic Value	$ 234.2
Options vested and expected to vest, Number of Shares	20.0
Options vested and expected to vest, Weighted-Average Exercise Price	$ 29.58
Options vested and expected to vest, Weighted-Average Remaining Contractual Term	3 years 9 months 4 days
Options vested and expected to vest, Aggregate Intrinsic Value	231.9
Exercisable, Number of Shares	14.0
Exercisable, Weighted-Average Exercise Price	$ 26.41
Exercisable, Weighted-Average Remaining Contractual Term	3 years 2 months 16 days
Exercisable, Aggregate Intrinsic Value	$ 189.7