Stockholders' Equity (Tables)

12 Months Ended

Apr. 26, 2013

Combined Activity Under Stock Option Plans and Agreements

A summary of the activity under our stock option plans and agreements is as follows (in millions, except for the exercise price and contractual term):

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
Outstanding as of April 30, 2010		35.2		$	23.02
Granted		3.9			45.28
Assumed in acquisition		0.2			16.56
Exercised		(13.8	)		21.85
Forfeited and expired		(1.0	)		34.43
Outstanding as of April 29, 2011		24.5			26.62
Granted		2.2			50.65
Exercised		(5.2	)		21.54
Forfeited and expired		(0.9	)		37.23
Outstanding as of April 27, 2012		20.6			29.98
Granted		2.4			28.87
Exercised		(3.0	)		18.37
Forfeited and expired		(0.8	)		40.11
Outstanding as of April 26, 2013		19.2			31.27		3.36	$	131.6
Options vested and expected to vest as of April 26, 2013		18.8			31.14		3.31		130.3
Exercisable as of April 26, 2013		14.7			29.15		2.77		118.8

Additional Information Related to Stock Options

Additional information related to our stock options is summarized below (in millions, except per share information):

	Year Ended
	April 26, 2013		April 27, 2012		April 29, 2011
Weighted-average fair value per share granted	$	11.52	$	16.70	$	15.83
Weighted-average fair value per share of vested options assumed in acquisition		N/A		N/A	$	21.15
Intrinsic value of options exercised	$	46.1	$	116.9	$	325.3
Proceeds received from the exercise of stock options	$	56.5	$	111.1	$	301.1
Fair value of options vested	$	55.9	$	71.8	$	96.6

Activity Related to Restricted Stock Units (RSUs)

The following table summarizes activity related to our RSUs (in millions, except for fair value):

	Number of Shares			Weighted- Average Grant Date Fair Value
Outstanding as of April 30, 2010		9.0		$	23.92
Granted		4.7			49.13
Vested		(2.9	)		22.52
Forfeited		(0.7	)		27.57
Outstanding as of April 29, 2011		10.1			35.79
Granted		6.5			47.17
Vested		(3.7	)		30.35
Forfeited		(0.9	)		40.91
Outstanding as of April 27, 2012		12.0			43.28
Granted		6.0			29.94
Vested		(4.0	)		39.83
Forfeited		(1.2	)		40.95
Outstanding as of April 26, 2013		12.8			38.36

Number and Value of the Shares Netted For Employee Taxes

The number and value of the shares netted for employee taxes are summarized in the table below (in millions):

	Year Ended
	April 26 2013		April 27, 2012		April 29, 2011
Shares withheld for taxes		1.3		1.2		1.0
Fair value of shares withheld	$	40.9	$	52.0	$	45.9

Schedule of Employee Stock Purchase Plan (ESPP) Disclosures

Additional information related to the purchase rights issued under the ESPP is provided below (in millions, except per right information):

	Year Ended
	April 26 2013		April 27, 2012		April 29, 2011
Weighted-average fair value per right granted	$	10.36	$	12.87	$	15.86
Shares issued under the ESPP		3.8		2.6		6.0
Proceeds from issuance of shares under the ESPP	$	95.0	$	89.6	$	69.0

Stock-Based Compensation Expense

Stock-based compensation expense consists primarily of expenses for stock options, RSUs and ESPP and is included in the consolidated statements of operations as follows (in millions):

	Year Ended
	April 26, 2013		April 27, 2012		April 29, 2011
Cost of product revenues	$	6.1	$	5.4	$	3.6
Cost of service revenues		19.4		17.8		14.4
Sales and marketing		132.2		126.0		81.5
Research and development		84.1		74.1		44.5
General and administrative		34.8		34.3		31.2
Total stock-based compensation expense	$	276.6	$	257.6	$	175.2

Income Tax Benefits Associated with Employee Stock Transactions

Total income tax benefit associated with employee stock transactions and recognized in stockholders’ equity was as follows (in millions):

	Year Ended
	April 26, 2013		April 27, 2012		April 29, 2011
Income tax benefit associated with employee stock transactions	$	53.8	$	107.5	$	128.5

Valuation Assumptions

The fair value of each award is estimated on the grant date using the Black-Scholes option pricing model, assuming no expected dividends and the following weighted-average assumptions:

	Stock Options Year Ended									ESPP Year Ended
	April 26, 2013			April 27, 2012			April 29, 2011			April 26, 2013			April 27, 2012			April 29, 2011
Expected term in years		4.8			4.8			4.8			1.2			1.2			1.2
Risk-free interest rate		0.63	%		1.50	%		2.01	%		0.19	%		0.19	%		0.37	%
Volatility		41	%		36	%		37	%		40	%		44	%		39	%