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Net (Loss) Income Per Share
 9 Months Ended
Oct. 31, 2015
Earnings Per Share [Abstract]  
Net (Loss) Income Per Share
Net (Loss) Income Per Share

Basic net (loss) 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 (loss) 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 (loss) income per share amounts:

 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2015
 
2014
 
2015
 
2014
Numerator:
 
 
 
 
 
 
 
Net (loss) income
$
(43.8
)
 
$
10.7

 
$
(293.3
)
 
$
70.3

Denominator:
 
 
 
 
 
 
 
Denominator for basic net (loss) income per share—weighted average shares
225.3

 
226.9

 
226.5

 
227.1

Effect of dilutive securities (1)
—

 
4.6

 
—

 
4.8

Denominator for dilutive net (loss) income per share
225.3

 
231.5

 
226.5

 
231.9

Basic net (loss) income per share
$
(0.19
)
 
$
0.05

 
$
(1.29
)
 
$
0.31

Diluted net (loss) income per share
$
(0.19
)
 
$
0.05

 
$
(1.29
)
 
$
0.30


____________________ 
(1)
The effect of dilutive securities of 3.4 million and 4.0 million shares for the three and nine months ended October 31, 2015, respectively, have been excluded from the calculation of diluted net (loss) income per share as those shares would have been anti-dilutive due to the net (loss) incurred during those periods.

The computation of diluted net (loss) 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 and nine months ended October 31, 2015, 0.6 million and 0.1 million potentially anti-dilutive shares, respectively, were excluded from the computation of diluted net (loss) income per share. For both the three and nine months ended October 31, 2014, no potentially anti-dilutive shares were excluded from the computation of diluted net income per share.