Stock Based Compensation (Tables)

6 Months Ended

Jul. 28, 2013

Notes to financial statements [Abstract]

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

	Three Months Ended				Six Months Ended
	July 28, 2013		July 29, 2012		July 28, 2013		July 29, 2012
	(In thousands)				(In thousands)
Cost of revenue	$	2,168	$	2,649	$	4,821	$	5,175
Research and development	18,555		18,885		40,490		40,092
Sales, general and administrative	11,672		10,721		20,481		22,557
Total	$	32,395	$	32,255	$	65,792	$	67,824

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

	Three Months Ended		Six Months Ended
	July 28, 2013	July 29, 2012	July 28, 2013	July 29, 2012
Stock Options	(Using a binomial model)
Expected life (in years)	2.4 - 3.4	3.1 - 4.8	2.4 - 3.4	3.1 - 4.8
Risk-free interest rate	1.8% - 2.7%	1.5% - 1.9%	1.8% - 2.7%	1.5% - 2.3%
Volatility	30% - 33%	43% - 48%	30% - 37%	43% - 48%
Dividend yield	2.1% - 2.2%	—	2.1% - 2.4%	—

	Three Months Ended		Six Months Ended
	July 28, 2013	July 29, 2012	July 28, 2013		July 29, 2012
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	—	—	37	%	44	%
Dividend yield	—	—	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	3,280		$	12.90
Exercised	(1,176	)	$	9.57
Cancelled	(2,408	)	$	19.89
Balances, July 28, 2013	32,691		$	14.28

	RSUs Outstanding		Weighted Average Grant-Date Fair Value
Restricted Stock Units	(In thousands)		(Per share)
Balances, January 27, 2013	15,159		$	14.46
Granted	5,558		$	11.93
Vested	(3,259	)	$	15.43
Cancelled	(628	)	$	13.89
Balances, July 28, 2013	16,830		$	13.46