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Net Income Per Share
 6 Months Ended
Jul. 31, 2014
Earnings Per Share [Abstract]  
Net Income Per Share
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, excluding stock options and restricted stock units. Diluted net income per share is based upon the weighted average number of 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 July 31,
 
Six Months Ended July 31,
 
2014
 
2013
 
2014
 
2013
Numerator:
 
 
 
 
 
 
 
Net income
$
31.3

 
$
61.7

 
$
59.6

 
$
117.3

Denominator:
 
 
 
 
 
 
 
Denominator for basic net income per share—weighted average shares
227.3

 
223.1

 
227.1

 
223.6

Effect of dilutive securities
5.1

 
5.2

 
5.3

 
5.7

Denominator for dilutive net income per share
232.4

 
228.3

 
232.4

 
229.3

Basic net income per share
$
0.14

 
$
0.28

 
$
0.26

 
$
0.52

Diluted net income per share
$
0.13

 
$
0.27

 
$
0.26

 
$
0.51



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 both the three and six months ended July 31, 2014, there were no potentially anti-dilutive shares excluded from the computation of diluted net income per share. For the three and six months ended July 31, 2013, 7.2 million and 7.6 million potentially anti-dilutive shares, respectively, were excluded from the computation of diluted net income per share.