Stock Based Compensation (Tables)

9 Months Ended

Oct. 28, 2012

Notes to financial statements [Abstract]

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

	Three Months Ended				Nine Months Ended
	October 28, 2012		October 30, 2011		October 28, 2012		October 30, 2011
	(In thousands)				(In thousands)
Cost of revenue	$	2,489	$	3,049	$	7,664	$	8,274
Research and development	20,056		19,308		60,148		59,594
Sales, general and administrative	10,524		10,872		33,081		33,050
Total	$	33,069	$	33,229	$	100,893	$	100,918

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

	Three Months Ended		Nine Months Ended
	October 28, 2012	October 30, 2011	October 28, 2012	October 30, 2011
Stock Options	(Using a binomial model)
Expected life (in years)	4.3-4.9	4.1-4.9	3.1-4.9	3.6-5.4
Risk free interest rate	1.7%-1.8%	1.9%-2.4%	1.5%-2.3%	1.9%-3.8%
Volatility	45%-49%	58%-65%	43%-49%	46%-65%
Dividend yield	—	—	—	—

	Three Months Ended				Nine Months Ended
	October 28, 2012		October 30, 2011		October 28, 2012	October 30, 2011
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%-0.2%		0.1%-0.2%		0.1%-0.3%	0.1%-0.7%
Volatility	47	%	61	%	44%-47%	57%-61%
Dividend yield	—		—		—	—

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 29, 2012	33,329		$	14.44
Granted	6,827		$	13.94
Exercised	(3,348	)	$	8.79
Cancelled	(3,396	)	$	16.98
Balances, October 28, 2012	33,412		$	14.66

	RSUs Outstanding		Weighted Average Grant-Date Fair Value
Restricted Stock Units	(In thousands)		(Per share)
Balances, January 29, 2012	13,638		$	15.10
Granted	7,486		$	13.99
Vested	(5,670	)	$	15.03
Cancelled	(656	)	$	15.26
Balances, October 28, 2012	14,798		$	14.55