Stock Based Compensation (Tables)

9 Months Ended

Oct. 27, 2013

Notes to financial statements [Abstract]

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

	Three Months Ended				Nine Months Ended
	October 27, 2013		October 28, 2012		October 27, 2013		October 28, 2012
	(In thousands)				(In thousands)
Cost of revenue	$	3,090	$	2,489	$	7,911	$	7,664
Research and development	20,902		20,056		61,392		60,148
Sales, general and administrative	10,307		10,524		30,788		33,081
Total	$	34,299	$	33,069	$	100,091	$	100,893

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

	Three Months Ended		Nine Months Ended
	October 27, 2013	October 28, 2012	October 27, 2013	October 28, 2012
Stock Options	(Using a binomial model)
Expected life (in years)	3.3-3.5	4.3-4.9	2.4-3.5	3.1-4.9
Risk-free interest rate	2.6%-3.0%	1.7%-1.8%	1.8%-3.0%	1.5% - 2.3%
Volatility	30%-32%	45%-49%	30%-37%	43% - 49%
Dividend yield	1.9%-2.0%	—	1.9%-2.4%	—

	Three Months Ended				Nine Months Ended
	October 27, 2013		October 28, 2012		October 27, 2013	October 28, 2012
Employee Stock Purchase Plan	(Using a Black-Scholes model)
Expected life (in years)	0.5-2.0		0.5-2.0		0.5 - 2.0	0.5 - 2.0
Risk-free interest rate	0.1%-0.4%		0.1%-0.2%		0.1%-0.4%	0.1% - 0.3%
Volatility	32	%	47	%	32%-37%	44%-47%
Dividend yield	2.0	%	—		2.0%-2.4%	—

Equity Award Activity

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

	Options Outstanding		Weighted Average Exercise Price
Stock Options	(In thousands)		(Per share)
Balances, January 27, 2013	32,995		$	14.66
Granted	6,049		$	14.29
Exercised	(2,557	)	$	10.15
Cancelled	(3,358	)	$	22.14
Balances, October 27, 2013	33,129		$	14.18

	RSUs Outstanding		Weighted Average Grant-Date Fair Value
Restricted Stock Units	(In thousands)		(Per share)
Balances, January 27, 2013	15,159		$	14.46
Granted	10,427		$	13.44
Vested	(5,891	)	$	14.80
Cancelled	(921	)	$	13.87
Balances, October 27, 2013	18,774		$	13.82