Stock Based Compensation (Tables)

6 Months Ended

Jul. 27, 2014

Employee Service Share-based Compensation, Aggregate Disclosures [Abstract]

Stock-based compensation expense, net of amounts capitalized as inventory



	Three Months Ended				Six Months Ended
	July 27, 2014		July 28, 2013		July 27, 2014		July 28, 2013
	(In thousands)				(In thousands)
Cost of revenue	$	2,656	$	2,168	$	5,575	$	4,821
Research and development	21,462		18,555		41,956		40,490
Sales, general and administrative	14,297		11,672		26,405		20,481
Total	$	38,415	$	32,395	$	73,936	$	65,792

Disclosure of Share-based Compensation Arrangements by Share-based Payment Award



	Three Months Ended			Six Months Ended
	July 27, 2014		July 28, 2013	July 27, 2014		July 28, 2013
Stock Options	(Using a binomial model)
Expected life (in years)	2.5		2.4 - 3.4	2.5 - 3.2		2.4 - 3.4
Risk-free interest rate	2.5	%	1.8% - 2.7%	2.5% - 2.8%		1.8% - 2.7%
Volatility	31	%	30% - 33%	31	%	30% - 37%
Dividend yield	1.8	%	2.1% - 2.2%	1.8% - 1.9%		2.1% - 2.4%



	Three Months Ended				Six Months Ended
	July 27, 2014		July 28, 2013		July 27, 2014		July 28, 2013
Employee Stock Purchase Plan	(Using a Black-Scholes model)
Expected life (in years)	—		—		0.5 - 2.0		0.5 - 2.0
Risk-free interest rate	—		—		0.1% - 0.3%		0.1% - 0.3%
Volatility	—	%	—	%	31	%	37	%
Dividend yield	—	%	—	%	1.9	%	2.4	%

Equity Award Activity

The following summarizes the stock option, RSU and PSU activity under our equity incentive plans:



	Options Outstanding		Weighted Average Exercise Price
Stock Options	(In thousands)		(Per share)
Balances, January 26, 2014	32,504		$	14.22
Granted	86		$	18.66
Exercised	(6,291	)	$	12.89
Cancelled	(942	)	$	18.89
Balances, July 27, 2014	25,357		$	14.39



	RSUs and PSUs Outstanding		Weighted Average Grant-Date Fair Value
RSUs and PSUs	(In thousands)		(Per share)
Balances, January 26, 2014	18,852		$	13.82
Granted (1)	3,729		$	17.20
Vested	(3,319	)	$	13.33
Cancelled	(793	)	$	13.98
Balances, July 27, 2014	18,469		$	14.58

(1) Includes the total number of PSUs issuable if the maximum corporate financial performance target level for fiscal year 2015 is achieved. Depending on the actual level of achievement of the corporate performance goal at the end of fiscal year 2015, the range of PSUs issued could range from 1.4 million to 2.5 million shares.

- Definition

Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate.

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