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Net Income Per Share
 3 Months Ended
Apr. 30, 2012
Net Income Per Share [Abstract]  
Earnings Per Share [Text Block]
Net Income Per Share

Basic net income per share is computed using the weighted average number of shares of common stock outstanding for the period, including restricted stock awards and excluding stock options and restricted stock units. Diluted net income per share is based upon the weighted average shares of common stock outstanding for the period and potentially dilutive common shares, including the effect of stock options and restricted stock units under the treasury stock method. The following table sets forth the computation of the numerators and denominators used in the basic and diluted net income per share amounts:

 
Three Months Ended April 30,
 
2012
 
2011
Numerator:
 
 
 
Net income
$
78.9

 
$
69.3

Denominator:
 
 
 
Denominator for basic net income per share—weighted average shares
228.1

 
228.2

Effect of dilutive securities
6.0

 
8.9

Denominator for dilutive net income per share
234.1

 
237.1

Basic net income per share
$
0.35

 
$
0.30

Diluted net income per share
$
0.34

 
$
0.29



The computation of diluted net income per share does not include shares that are anti-dilutive under the treasury stock method because their exercise prices are higher than the average market value of Autodesk’s stock during the period. For the three months ended April 30, 2012 and 2011, 9.1 million and 6.7 million potentially anti-dilutive shares, respectively, were excluded from the computation of net income per share.