Stockholders' Equity (Tables)

6 Months Ended

Oct. 26, 2012

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):

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (Years)		Aggregate Intrinsic Value
Outstanding at April 27, 2012		20.6		$	29.98
Options granted		2.2			30.03
Options exercised		(1.1	)		18.05
Options forfeited and expired		(0.6	)		39.75
Outstanding at October 26, 2012		21.1			30.31		3.66	$	75.3
Options vested and expected to vest as of October 26, 2012		20.5			30.07		3.59		75.2
Exercisable at October 26, 2012		15.0			27.46		2.95		69.3

Additional Information Related To Stock Options

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

	Three Months Ended				Six Months Ended
	October 26, 2012		October 28, 2011		October 26, 2012		October 28, 2011
Weighted-average fair value per share granted	$	12.40	$	13.77	$	10.86	$	16.96
Intrinsic value of options exercised	$	10.4	$	6.8	$	15.8	$	50.6
Proceeds received from the exercise of stock options	$	12.8	$	7.7	$	19.5	$	42.7
Fair value of options vested	$	15.1	$	20.3	$	29.5	$	38.7

Activity Related To Restricted Stock Units (RSUs)

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

	Number of Shares			Weighted- Average Grant Date Fair Value
Outstanding at April 27, 2012		12.0		$	43.28
RSUs granted		5.0			29.31
RSUs vested		(2.3	)		39.74
RSUs forfeited		(0.7	)		41.32
Outstanding at October 26, 2012		14.0			39.01

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):

	Three Months Ended				Six Months Ended
	October 26, 2012		October 28, 2011		October 26, 2012		October 28, 2011
Shares withheld for taxes		0.1		0.1		0.7		0.6
Fair value of shares withheld and retired	$	2.8	$	2.5	$	22.6	$	27.8

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 and per share information):

	Six Months Ended
	October 26, 2012		October 28, 2011
Weighted-average fair value per right granted	$	10.25	$	15.88
Shares issued under the ESPP		1.9		1.1
Weighted-average price per share issued	$	25.30	$	39.17

Stock-Based Compensation Expense

Stock-based compensation expense included in the condensed consolidated statements of operations is as follows (in millions):

	Three Months Ended				Six Months Ended
	October 26, 2012		October 28, 2011		October 26, 2012		October 28, 2011
Cost of product revenues	$	1.5	$	1.4	$	3.3	$	2.5
Cost of service revenues		4.6		4.2		10.2		8.1
Sales and marketing		30.9		30.4		69.9		59.0
Research and development		19.3		18.2		43.0		34.2
General and administrative		8.7		8.8		17.8		17.3
Total stock-based compensation expense	$	65.0	$	63.0	$	144.2	$	121.1

Stock-Based Compensation Expense Associated With Each Type Of Award

The following table summarizes stock-based compensation associated with each type of award (in millions):

	Three Months Ended				Six Months Ended
	October 26, 2012		October 28, 2011		October 26, 2012		October 28, 2011
Employee stock options	$	11.7	$	14.7	$	23.7	$	29.2
RSUs		43.3		38.9		87.8		73.3
ESPP		10.0		9.4		32.7		18.6
Total stock-based compensation expense	$	65.0	$	63.0	$	144.2	$	121.1

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):

	Six Months Ended
	October 26, 2012		October 28, 2011
Income tax benefit associated with employee stock transactions	$	28.2	$	79.1

Valuation Assumptions - Stock Options

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
	Three Months Ended						Six Months Ended
	October 26, 2012			October 28, 2011			October 26, 2012			October 28, 2011
Expected term in years		4.8			4.8			4.8			4.8
Risk-free interest rate		0.62	%		0.97	%		0.63	%		1.55	%
Volatility		43	%		41	%		41	%		36	%

Valuation Assumptions - ESPP

	ESPP
	Six Months Ended
	October 26, 2012			October 28, 2011
Expected term in years		1.2			1.2
Risk-free interest rate		0.18	%		0.25	%
Volatility		38	%		35	%