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Net Loss Per Share
 9 Months Ended
Oct. 31, 2016
Earnings Per Share [Abstract]  
Net (Loss) Income Per Share
Net Loss Per Share

Basic net loss 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 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 per share amounts:

 
Three Months Ended October 31,
 
Nine Months Ended October 31,
 
2016
 
2015
 
2016
 
2015
Numerator:
 
 
 
 
 
 
 
Net loss
$
(142.8
)
 
$
(43.8
)
 
$
(408.7
)
 
$
(293.3
)
Denominator:
 
 
 
 
 
 
 
Denominator for basic net loss per share—weighted average shares
222.3

 
225.3

 
223.3

 
226.5

Effect of dilutive securities (1)
—

 
—

 
—

 
—

Denominator for dilutive net loss per share
222.3

 
225.3

 
223.3

 
226.5

Basic net loss per share
$
(0.64
)
 
$
(0.19
)
 
(1.83
)
 
$
(1.29
)
Diluted net loss per share
$
(0.64
)
 
$
(0.19
)
 
(1.83
)
 
$
(1.29
)

____________________ 
(1)
The effect of dilutive securities of 4.4 million shares and 3.4 million shares for the three months ended October 31, 2016 and 2015, respectively, have been excluded from the calculation of diluted net loss per share as those shares would have been anti-dilutive due to the net loss incurred during those periods. The effect of dilutive securities of 4.0 million shares in each of the nine months ended October 31, 2016 and 2015 have been excluded from the calculation of diluted net loss 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 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 October 31, 2016, no potentially anti-dilutive shares were excluded from the computation of diluted net loss per share. For the three months ended October 31, 2015, 0.6 million potentially anti-dilutive shares were excluded from the computation of diluted net loss per share. For the nine months ended October 31, 2016 and 2015, 0.4 million and 0.1 million potentially anti-dilutive shares were excluded from the computation of diluted net loss per share, respectively.