Stockholders' Equity (Stock Options Outstanding Under Option Plans) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Apr. 27, 2012
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Exercisable, Number	14.0
Options Exercisable, Weighted-Average Exercise Price	$ 26.41
$0.55 - $13.56 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 0.55
Exercise Price Range, Upper Range Limit	$ 13.56
Options Outstanding, Number	2.6
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	3 years 2 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 12.65
Options Exercisable, Number	2.0
Options Exercisable, Weighted-Average Exercise Price	$ 12.39
$13.63 - $20.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 13.63
Exercise Price Range, Upper Range Limit	$ 20.69
Options Outstanding, Number	3.0
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	3 years 4 days
Options Outstanding, Weighted-Average Exercise Price	$ 19.09
Options Exercisable, Number	2.3
Options Exercisable, Weighted-Average Exercise Price	$ 18.70
$20.70 - $23.04 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 20.70
Exercise Price Range, Upper Range Limit	$ 23.04
Options Outstanding, Number	2.1
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	2 years 7 months 10 days
Options Outstanding, Weighted-Average Exercise Price	$ 22.06
Options Exercisable, Number	2.1
Options Exercisable, Weighted-Average Exercise Price	$ 22.07
$23.33 - $26.20 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 23.33
Exercise Price Range, Upper Range Limit	$ 26.20
Options Outstanding, Number	2.1
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	3 years 6 months 4 days
Options Outstanding, Weighted-Average Exercise Price	$ 24.35
Options Exercisable, Number	1.8
Options Exercisable, Weighted-Average Exercise Price	$ 24.32
$26.37 - $32.50 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 26.37
Exercise Price Range, Upper Range Limit	$ 32.50
Options Outstanding, Number	2.4
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	2 years 7 months 21 days
Options Outstanding, Weighted-Average Exercise Price	$ 30.41
Options Exercisable, Number	2.3
Options Exercisable, Weighted-Average Exercise Price	$ 30.39
$32.70 - $33.54 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 32.70
Exercise Price Range, Upper Range Limit	$ 33.54
Options Outstanding, Number	2.1
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	4 years 5 months 12 days
Options Outstanding, Weighted-Average Exercise Price	$ 33.46
Options Exercisable, Number	1.1
Options Exercisable, Weighted-Average Exercise Price	$ 33.40
$33.73 - $38.64 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 33.73
Exercise Price Range, Upper Range Limit	$ 38.64
Options Outstanding, Number	2.1
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	4 years 9 months 7 days
Options Outstanding, Weighted-Average Exercise Price	$ 36.88
Options Exercisable, Number	1.0
Options Exercisable, Weighted-Average Exercise Price	$ 36.46
$39.63 - $52.67 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 39.63
Exercise Price Range, Upper Range Limit	$ 52.67
Options Outstanding, Number	2.5
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	5 years 7 days
Options Outstanding, Weighted-Average Exercise Price	$ 48.17
Options Exercisable, Number	1.1
Options Exercisable, Weighted-Average Exercise Price	$ 45.66
$53.10 - $58.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 53.10
Exercise Price Range, Upper Range Limit	$ 58.99
Options Outstanding, Number	1.7
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	6 years 11 months
Options Outstanding, Weighted-Average Exercise Price	$ 53.63
Options Exercisable, Number	0.3
Options Exercisable, Weighted-Average Exercise Price	$ 53.83
$0.55 - $58.99 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Range, Lower Range Limit	$ 0.55
Exercise Price Range, Upper Range Limit	$ 58.99
Options Outstanding, Number	20.6
Options Outstanding, Weighted-Average Remaining Contractual Term (In Years)	3 years 9 months 22 days
Options Outstanding, Weighted-Average Exercise Price	$ 29.98
Options Exercisable, Number	14.0
Options Exercisable, Weighted-Average Exercise Price	$ 26.41