Stockholders' Equity (Tables)

12 Months Ended

Apr. 27, 2012

Stockholders' Equity [Abstract]

Combined Activity Under Stock Option Plans And Agreements

	Numbers of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value
Outstanding at April 24, 2009		66.1		$	29.27
Options granted		7.1			26.95
Options exercised		(8.5	)		19.33
Options cancelled in the Exchange		(24.5	)		39.05
Options forfeitures and cancellations		(5.0	)		39.12
Outstanding at April 30, 2010		35.2			23.02
Options granted		3.9			45.28
Options assumed in acquisition		0.2			16.56
Options exercised		(13.8	)		21.85
Options forfeitures and cancellations		(1.0	)		34.43
Outstanding at April 29, 2011		24.5			26.62
Options granted		2.2			50.65
Options exercised		(5.2	)		21.54
Options forfeitures and cancellations		(0.9	)		37.23
Outstanding at April 27, 2012		20.6			29.98		3.81	$	234.2
Options vested and expected to vest as of April 27, 2012		20.0		$	29.58		3.76	$	231.9
Exercisable at April 27, 2012		14.0		$	26.41		3.21	$	189.7

Additional Information Related To Stock Options

	Year Ended
	April 27, 2012		April 29, 2011		April 30, 2010
Weighted-average fair value per share granted	$	16.70	$	15.83	$	9.74
Weighted-average fair value per share of options assumed in acquisition		N/A	$	21.15		N/A
Intrinsic value of options exercised	$	116.9	$	325.3	$	92.9
Proceeds received from the exercise of stock options	$	111.1	$	301.1	$	165.1
Fair value of options vested	$	71.8	$	96.6	$	165.6

Stock Options Outstanding Under Option Plans

				Options Outstanding						Options Exercisable
Range of Exercise Prices				Number of Shares (in millions)		Weighted- Average Remaining Contractual Term (in years)		Weighted- Average Exercise Price		Number of Shares (in  millions)		Weighted- Average Exercise Price
$	0.55	$	13.56		2.6		3.20	$	12.65		2.0	$	12.39
	13.63		20.69		3.0		3.01		19.09		2.3		18.70
	20.70		23.04		2.1		2.61		22.06		2.1		22.07
	23.33		26.20		2.1		3.51		24.35		1.8		24.32
	26.37		32.50		2.4		2.64		30.41		2.3		30.39
	32.70		33.54		2.1		4.45		33.46		1.1		33.40
	33.73		38.64		2.1		4.77		36.88		1.0		36.46
	39.63		52.67		2.5		5.02		48.17		1.1		45.66
	53.10		58.99		1.7		6.03		53.63		0.3		53.83
$	0.55	$	58.99		20.6		3.81	$	29.98		14.0	$	26.41

Activity Related To Restricted Stock Units (RSUs)

	Number of Shares			Weighted- Average Grant Date Fair Value
Outstanding at April 24, 2009		5.5		$	22.38
RSUs granted		3.1			29.32
RSUs issued in Exchange		3.2			21.73
RSUs vested		(2.1	)		24.64
RSUs forfeitures and cancellations		(0.7	)		23.39
Outstanding at April 30, 2010		9.0			23.92
RSUs granted		4.7			49.13
RSUs vested		(2.9	)		22.52
RSUs forfeitures and cancellations		(0.7	)		27.57
Outstanding at April 29, 2011		10.1			35.79
RSUs granted		6.5			47.17
RSUs vested		(3.7	)		30.35
RSUs forfeitures and cancellations		(0.9	)		40.91
Outstanding at April 27, 2012		12.0			43.28

Number And Value Of The Shares Netted For Employee Taxes

	Year Ended
	April 27, 2012		April 29, 2011		April 30, 2010
Shares withheld for taxes		1.2		1.0		0.7
Fair value of shares withheld and retired	$	52.0	$	45.9	$	20.8

Schedule Of Employee Stock Purchase Plan (ESPP) Disclosures

	Year Ended
	April 27, 2012		April 29, 2011		April 30, 2010
Weighted-average fair value per right granted	$	12.87	$	15.86	$	8.86
Shares issued under the ESPP		2.6		6.0		5.1
Weighted-average price per share issued	$	34.53	$	11.50	$	10.49

Stock-Based Compensation Expense

	Year Ended
	April 27, 2012		April 29, 2011		April 30, 2010
Cost of product revenues	$	5.4	$	3.6	$	4.0
Cost of service revenues		17.8		14.4		14.3
Sales and marketing		126.0		81.5		73.7
Research and development		74.1		44.5		38.5
General and administrative		34.3		31.2		29.3
Total stock-based compensation expense	$	257.6	$	175.2	$	159.8

Stock-Based Compensation Expense Associated With Each Type Of Award

	Year Ended
	April 27, 2012		April 29, 2011		April 30, 2010
Employee stock options	$	55.4	$	53.7	$	61.1
RSU's		153.9		88.9		64.1
ESPP		48.3		32.6		34.3
Change in amounts capitalized in inventory		0.0		0.0		0.3
Total stock-based compensation expense	$	257.6	$	175.2	$	159.8

Income Tax Benefits Associated With Employee Stock Transactions

	Year Ended
	April 27, 2012		April 29, 2011		April 30, 2010
Income tax benefits (charges) associated with employee stock transactions	$	107.5	$	128.5	$	(0.9	)

Valuation Assumptions

	Stock Options Year Ended									ESPP Year Ended
	April 27, 2012			April 29, 2011			April 30, 2010			April 27, 2012			April 29, 2011			April 30, 2010
Expected term in years		4.8			4.8			4.5			1.2			1.2			1.3
Risk-free interest rate		1.50	%		2.01	%		2.27	%		0.19	%		0.37	%		0.39	%
Volatility		36	%		37	%		41	%		44	%		39	%		39	%