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Net (Loss) Income Per Share | 12 Months Ended
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Jan. 31, 2017
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. 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:
| Fiscal Year Ended January 31,
| 2017 |  | 2016 |  | 2015
Numerator: |  |  |  |  |
Net (loss) income | $ | (582.1 | ) |  | $ | (330.5 | ) |  | $ | 81.8 |
Denominator: |  |  |  |  |
Denominator for basic net (loss) income per share—weighted average shares | 222.7 |  |  | 226.0 |  |  | 227.1 |
Effect of dilutive securities (1) | — |  |  | — |  |  | 5.3 |
Denominator for dilutive net (loss) income per share | 222.7 |  |  | 226.0 |  |  | 232.4 |
Basic net (loss) income per share | $ | (2.61 | ) |  | $ | (1.46 | ) |  | $ | 0.36 |
Diluted net (loss) income per share | $ | (2.61 | ) |  | $ | (1.46 | ) |  | $ | 0.35 |
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(1) | The effect of dilutive securities of 4.6 million and 4.7 million shares for the fiscal year ended January 31, 2017 and 2016, 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 these fiscal years.
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 fiscal year. For each of the fiscal years ended January 31, 2017, 2016, and 2015, 0.1 million potentially anti-dilutive shares were excluded from the computation of net (loss) income per share.

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