Stock Based Compensation (Tables)

12 Months Ended

Jan. 27, 2013

Notes to financial statements [Abstract]

Schedule of Share-based Compensation, Activity [Table Text Block]

			Options Outstanding							Restricted Stock Units Outstanding
	Total Stock Awards Available for Grant		Number of Shares		Weighted Average Exercise Price Per Share		Weighted Average Remaining  Contractual Life	Aggregate Intrinsic Value (1)		Number of Shares		Weighted Average Grant-Date Fair Value
Balances, January 31, 2010	44,016,042		58,348,422		$	11.30				7,488,512		$	12.28
Authorized	—		—		$	—				—		—
Granted	(12,923,659	)	5,818,966		$	13.79				7,104,693		$	13.61
Exercised	—		(18,287,483	)	$	8.16				—		—
Vested Restricted Stock	—		—		—					(3,215,633	)	$	11.74
Canceled and forfeited	2,644,105		(1,878,447	)	$	12.56				(765,658	)	$	13.76
Balances, January 30, 2011	33,736,488		44,001,458		$	12.88				10,611,914		$	13.23
Authorized	—		—		$	—				—		—
Granted	(13,767,554	)	6,430,778		$	16.18				7,336,776		$	16.31
Exercised	—		(15,515,053	)	$	10.70				—		—
Vested Restricted Stock	—		—		—					(3,442,076	)	$	12.02
Canceled and forfeited	2,457,018		(1,588,207	)	$	14.78				(868,811	)	$	14.72
Balances, January 29, 2012	22,425,952		33,328,976		$	14.44				13,637,803		$	15.10
Authorized (2)	25,000,000		—		$	—				—		—
Granted	(15,254,977	)	7,119,319		$	13.88				8,135,658		$	13.86
Exercised	—		(3,646,680	)	$	8.66				—		—
Vested Restricted Stock	—		—		—					(5,691,623	)	$	15.02
Canceled and forfeited	4,728,901		(3,806,290	)	$	17.04				(922,611	)	$	15.14
Balances, January 27, 2013	36,899,876		32,995,325		$	14.66	5.08	$	26,006,026	15,159,227		$	14.46
Exercisable at January 27, 2013			20,156,213		$	14.89	3.00	$	22,850,198
Vested and Expected to Vest after January 27, 2013			30,971,523		$	14.68	4.86	$	25,520,514	12,245,083		$	14.46

(1)  The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value for in-the-money options at January 27, 2013, based on the $12.41 closing stock price of our common stock on the NASDAQ Global Select Market on January 25, 2013, the last trading day of fiscal year 2013, which would have been received by the option holders had all in-the-money option holders exercised their options as of that date. The total number of in-the-money options outstanding and exercisable as of January 27, 2013 was 26.7 million shares and 9.6 million shares, respectively.

(2) Represents the shares that were approved at our 2012 Annual Meeting of Stockholders.

The total intrinsic value of options exercised was $21.1 million, $105.3 million and $139.1 million for fiscal years 2013, 2012 and 2011, respectively. Upon exercise of an option, we issue new shares of stock. The total fair value of options vested was $40.3 million, $49.5 million and $60.7 million for fiscal years 2013, 2012 and 2011, respectively.

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Year Ended
	January 27, 2013	January 29, 2012	January 30, 2011
Stock Options	(Using a binomial model)
Weighted average expected life (in years)	3.1-4.9	3.0-5.4	3.1-6.7
Risk-free interest rate	1.5%-2.3%	1.9%-3.8%	1.5%-3.3%
Volatility	39%-49%	46%-65%	42%-53%
Dividend yield	2.4%	—	—

	Year Ended
	January 27, 2013	January 29, 2012	January 30, 2011
Employee Stock Purchase Plan	(Using the Black-Scholes model)
Weighted average expected life (in years)	0.5-2.0	0.5-2.0	0.5-2.0
Risk-free interest rate	0.1%-0.3%	0.1%-0.7%	0.2%-0.8%
Volatility	44%-47%	57%-61%	45%-47%
Dividend yield	—	—	—

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

	Year Ended
	January 27, 2013		January 29, 2012		January 30, 2011
	(In thousands)
Cost of revenue	$	10,490	$	11,322	$	8,308
Research and development	82,157		80,502		57,974
Sales, general and administrative	44,015		44,530		34,071
Total	$	136,662	$	136,354	$	100,353