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Net Loss Per Share | 9 Months Ended
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Oct. 31, 2018
Earnings Per Share [Abstract] |
Net Loss 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,
| 2018 |  | 2017 |  | 2018 |  | 2017
Numerator: |  |  |  |  |  |  |
Net loss | $ | (23.7 | ) |  | $ | (119.8 | ) |  | $ | (145.5 | ) |  | $ | (393.4 | )
Denominator: |  |  |  |  |  |  |
Denominator for basic net loss per share—weighted average shares | 218.9 |  |  | 219.6 |  |  | 218.7 |  |  | 219.7 |
Effect of dilutive securities (1) | — |  |  | — |  |  | — |  |  | — |
Denominator for dilutive net loss per share | 218.9 |  |  | 219.6 |  |  | 218.7 |  |  | 219.7 |
Basic net loss per share | $ | (0.11 | ) |  | $ | (0.55 | ) |  | $ | (0.67 | ) |  | $ | (1.79 | )
Diluted net loss per share | $ | (0.11 | ) |  | $ | (0.55 | ) |  | $ | (0.67 | ) |  | $ | (1.79 | )
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(1) | The effect of dilutive securities of 2.7 million and 4.1 million shares in the three months ended October 31, 2018 and 2017, 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 3.0 million and 4.4 million shares in the nine months ended October 31, 2018 and 2017, respectively, has 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, 2018 and 2017, 0.7 million and zero potentially anti-dilutive shares were excluded from the computation of diluted net loss per share, respectively. For both the nine months ended October 31, 2018 and 2017, 0.3 million potentially anti-dilutive shares were excluded from the computation of diluted net loss per share, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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