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Employee and Director Stock Plans (Tables) | 12 Months Ended
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Jan. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Stock Options, Activity | A summary of stock option activity for the fiscal year ended January 31, 2017 is as follows:
| Number of Shares (in millions) |  | Weighted average exercise price per share |  | Weighted average remaining contractual term (in years) |  | Aggregate Intrinsic Value (1) (in millions)
Options outstanding at January 31, 2016 | 1.6 |  |  | $ | 37.06 |  |  |  |  |
Exercised | (1.0 | ) |  | 35.85 |  |  |  |  |
Options vested, exercisable and outstanding at January 31, 2017 | 0.6 |  |  | $ | 39.25 |  |  | 3.1 |  | $ | 25.8 |
Options available for grant at January 31, 2017 | 13.3 |  |  |  |  |  |  |
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(1) | Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $81.34 per share as of January 31, 2017, which would have been received by the option holders had all option holders exercised their options as of that date.
Intrinsic Value of Options Exercised and Weighted Average Grant Date Fair Value of Stock Options Granted | The following table summarizes information about the pre-tax intrinsic value of options exercised during the fiscal years ended January 31, 2017, 2016, and 2015:
| Fiscal year ended January 31,
| 2017 |  | 2016 |  | 2015
Pre-tax intrinsic value of options exercised (1) | $ | 32.0 |  |  | $ | 32.6 |  |  | $ | 67.6 |
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(1) | The intrinsic value of options exercised is calculated as the difference between the exercise price of the option and the market value of the stock on the date of exercise.
The following table summarizes information about options vested and exercisable, and outstanding at January 31, 2017:
| Number of Shares (in millions) |  | Weighted average exercise price per share
Range of per-share exercise prices: |  |  |
$27.40 - $38.55 | 0.2 |  |  | $ | 33.00 |
$38.56 - $42.38 | 0.3 |  |  | 41.62 |
$42.39 - $43.81 | 0.1 |  |  | 43.81 |
| 0.6 |  |  | $ | 39.25 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | The following table summarizes information about options vested and exercisable, and outstanding at January 31, 2017:
| Number of Shares (in millions) |  | Weighted average exercise price per share
Range of per-share exercise prices: |  |  |
$27.40 - $38.55 | 0.2 |  |  | $ | 33.00 |
$38.56 - $42.38 | 0.3 |  |  | 41.62 |
$42.39 - $43.81 | 0.1 |  |  | 43.81 |
| 0.6 |  |  | $ | 39.25 |
Restricted Share Activity Disclosure | A summary of restricted stock activity for the fiscal year ended January 31, 2017 is as follows:
| Unreleased Restricted Stock Units (in thousands) |  | Weighted average grant date fair value per share
Unvested restricted stock at January 31, 2016 | 7,739.6 |  |  | $ | 51.80 |
Granted | 4,226.3 |  |  | 65.95 |
Vested | (3,585.0 | ) |  | 52.12 |
Canceled/Forfeited | (725.2 | ) |  | 53.25 |
Performance Adjustment (1) | (33.3 | ) |  | 63.74 |
Unvested restricted stock at January 31, 2017 | 7,622.4 |  |  | $ | 60.13 |
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(1) | Based on Autodesk's financial results and relative total stockholder return for the fiscal 2016 performance period. The performance stock units were attained at rates ranging from 86.1% to 98.0% of the target award.
Employee and Director Stock Options Outstanding | The following table summarizes the number of outstanding options granted to employees and directors, as well as the number of securities remaining available for future issuance under these plans as of January 31, 2017:
| (a) |  | (b) |  | (c) |
Plan category | Number of securities to be issued upon exercise of outstanding options (in millions) |  | Weighted-average exercise price of outstanding options |  | Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a)) (in millions) |
Equity compensation plans approved by security holders | 8.2 |  |  | $ | 39.25 |  |  | 58.9 |  | (1)
Total | 8.2 |  |  | $ | 39.25 |  |  | 58.9 |  |
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(1) | Included in this amount are 45.6 million securities available for future issuance under Autodesk’s ESPP.

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