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Net Income (Loss) Per Share | 6 Months Ended
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Jul. 31, 2019
Earnings Per Share [Abstract] |
Net Income (Loss) Per Share | Net Income (Loss) Per Share Basic net income (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 income (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 income (loss) per share amounts:
| Three Months Ended July 31, |  | Six Months Ended July 31,
| 2019 |  | 2018 |  | 2019 |  | 2018
Numerator: |  |  |  |  |  |  |
Net income (loss) | $ | 40.2 |  |  | $ | (39.4 | ) |  | $ | 16.0 |  |  | $ | (121.8 | )
Denominator: |  |  |  |  |  |  |
Denominator for basic net income (loss) per share—weighted average shares | 219.6 |  |  | 219.0 |  |  | 219.6 |  |  | 218.8 |
Effect of dilutive securities (1) | 2.8 |  |  | — |  |  | 2.7 |  |  | — |
Denominator for dilutive net income (loss) per share | 222.4 |  |  | 219.0 |  |  | 222.3 |  |  | 218.8 |
Basic net income (loss) per share | $ | 0.18 |  |  | $ | (0.18 | ) |  | $ | 0.07 |  |  | $ | (0.56 | )
Diluted net income (loss) per share | $ | 0.18 |  |  | $ | (0.18 | ) |  | $ | 0.07 |  |  | $ | (0.56 | )
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(1) | The effect of dilutive securities of 3.2 million and 3.3 million shares in the three and six months ended July 31, 2018, respectively, have been excluded from the calculation of diluted net income (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 income (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 periods. There were no potentially anti-dilutive shares excluded from the computation of diluted net income (loss) per share for the three and six months ended July 31, 2019 and 2018, 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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