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Net Income (Loss) Per Share (Tables)
6 Months Ended
Jul. 31, 2011
Notes to financial statements [Abstract]  
Reconciliation of numerators and denominators of basic and diluted net income (loss) per share computations
Three Months Ended
   
Six Months Ended
 
   
July 31, 2011
   
August 1,
2010
   
July 31,
2011
   
August 1,
2010
 
   
(In thousands, except per share data)
 
Numerator:
                   
 Net Income (loss)
 
$
151,573
   
$
(140,961
)
 
$
286,792
   
$
(3,367
)
Denominator:
                               
 Denominator for basic net loss per share, weighted average shares
   
601,340
     
572,764
     
598,077
     
569,971
 
 Effect of dilutive securities:
                               
 Equity awards outstanding
   
12,594
     
-
     
17,475
     
-
 
 Denominator for diluted net income per share, weighted average shares
   
613,934
     
572,764
     
615,552
     
569,971
 
                                 
 Net Income (loss) per share:
                               
 Basic net Income (loss) per share
 
$
0.25
   
$
(0.25
)
 
$
0.48
   
$
(0.01
)
 Diluted net Income (loss) per share
 
$
0.25
   
$
(0.25
)
 
$
0.47
   
$
(0.01
)