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Stock Based Compensation (Tables)
 12 Months Ended
Jan. 29, 2012
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 25, 2009
29,500,759

 
97,454,280

 
$
13.83

 
 
 
 
 
—

 
—

Authorized
—

 
—

 
$
—

 
 
 
 
 
 
 
 
Granted
(15,374,295
)
 
7,701,396

 
$
11.50

 
 
 
 
 
7,672,899

 
$
12.26

Exercised
—

 
(17,099,663
)
 
$
5.74

 
 
 
 
 
 
 
 
Vested Restricted Stock
 
 
 
 
 
 
 
 
 
 
(2,400
)
 
$
12.40

Canceled and forfeited
1,357,528

 
(1,175,541
)
 
$
12.90

 
 
 
 
 
(181,987
)
 
$
11.37

Cancellations related to stock options purchase (2)
28,532,050

 
(28,532,050
)
 
$
23.35

 
 
 
 
 
 
 
 
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

 
4.15

 
$
79,174,063

 
13,637,803

 
$
15.10

Exercisable at January 29, 2012
 
 
21,434,294

 
$
13.80

 
2.28

 
$
66,073,341

 
 
 
 
Vested and Expected to Vest after January 29,2012
 
 
31,451,419

 
$
14.38

 
3.95

 
$
77,103,721

 
11,017,627

 
$
15.10
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
 
Year Ended
 
January 29,
2012
 
January 30,
2011
 
January 31,
2010
Stock Options
(Using a binomial model)
Weighted average expected life of stock options (in years)
3.0-5.4

 
3.1-6.7

 
3.7-5.8

Risk free interest rate
1.9%-3.8%

 
1.5%-3.3%

 
1.8%-2.9%

Volatility
46%-65%

 
42%-53%

 
45%-72%

Dividend yield
—

 
—

 
—


 
Year Ended
 
January 29,
2012
 
January 30,
2011
 
January 31,
2010
Employee Stock Purchase Plan
(Using the Black-Scholes model)
Weighted average expected life of stock options (in years)
0.5-2.0

 
0.5-2.0

 
0.5-2.0

Risk free interest rate
0.1%-0.7%

 
0.2%-0.8%

 
0.2 %– 1.0%

Volatility
57%-61%

 
45%-47%

 
53%-73%

Dividend yield
—

 
—

 
—
Stock-based compensation expense, net of amounts capitalized as inventory
 
Year Ended
 
January 29,
2012
 
January 30,
2011
 
January 31,
2010
 
(In thousands)
Cost of revenue
$
11,322

 
$
8,308

 
$
12,050

Research and development
80,502

 
57,974

 
61,337

Sales, general and administrative
44,530

 
34,071

 
33,704

Total
$
136,354

 
$
100,353

 
$
107,091