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Employee and Director Stock Plans (Tables) | 12 Months Ended
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Jan. 31, 2015
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, 2015 is as follows:
| Number of Shares |  | Weighted average exercise price per share |  | Weighted average remaining contractual term |  | Aggregate Intrinsic Value (3)
| (in millions) |  |  |  | (in years) |  | (in millions)
Options outstanding at January 31, 2014 | 5.9 |  |  | $ | 33.54 |  |  |  |  |
Granted (1) | — |  |  | — |  |  |  |  |
Exercised | (3.2 | ) |  | 32.76 |  |  |  |  |
Canceled/Forfeited | — |  |  | — |  |  |  |  |
Options outstanding at January 31, 2015 | 2.7 |  |  | $ | 34.46 |  |  | 4.2 |  | $ | 53.1 |
Options vested and exercisable at January 31, 2015 | 2.5 |  |  | $ | 33.72 |  |  | 3.9 |  | $ | 49.9 |
Options vested and exercisable as of January 31, 2015 and expected to vest thereafter (2) | 2.7 |  |  | $ | 34.46 |  |  | 4.2 |  | $ | 53.1 |
Options available for grant at January 31, 2015 | 14.3 |  |  |  |  |  |  |
_______________
(1) | Autodesk did not grant stock options in the twelve months ended January 31, 2015.
(2) | Options expected to vest reflect an estimated forfeiture rate.
(3) | Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $54.01 per share as of January 31, 2015, 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 and the weighted average grant date fair value per share of options granted during the fiscal years ended January 31, 2015, 2014, and 2013:
| Fiscal year ended January 31,
| 2015 |  | 2014 |  | 2013
Intrinsic value of options exercised (1) | $ | 67.6 |  |  | $ | 149.0 |  |  | $ | 90.9 |
Weighted average grant date fair value per share of stock options granted (2) | $ | — |  |  | $ | — |  |  | $ | 13.4 |
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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.
(2) | The weighted average grant date fair value per share of stock options granted is calculated, as of the stock option grant date, using the Black-Scholes Merton ("BSM") option pricing model. For the twelve months ended January 31, 2015 and 2014, Autodesk did not grant stock options.
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, 2015:
| Options Vested and Exercisable |  | Options Outstanding
| Number of Shares (in millions) |  | Weighted average contractual life (in years) |  | Weighted average exercise price per share |  | Aggregate intrinsic value(1) (in millions) |  | Number of Shares (in millions) |  | Weighted average contractual life (in years) |  | Weighted average exercise price per share |  | Aggregate intrinsic value(1) (in millions)
Range of per-share exercise prices: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
$12.31 - $29.49 | 0.9 |  |  |  |  | $ | 23.76 |  |  |  |  | 0.9 |  |  |  |  | $ | 23.83 |  |  |
$29.50 - $41.62 | 1.2 |  |  |  |  | 38.73 |  |  |  |  | 1.3 |  |  |  |  | 38.85 |  |  |
$42.39 - $43.81 | 0.4 |  |  |  |  | 43.80 |  |  |  |  | 0.5 |  |  |  |  | 43.79 |  |  |
| 2.5 |  |  | 3.9 |  | $ | 33.72 |  |  | $ | 49.9 |  |  | 2.7 |  |  | 4.2 |  | $ | 34.46 |  |  | $ | 53.1 |
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(1) | Represents the total pre-tax intrinsic value, based on Autodesk’s closing stock price of $54.01 per share as of January 31, 2015, which would have been received by the option holders had all option holders exercised their options as of that date.
Restricted Share Activity Disclosure | A summary of restricted stock unit activity for the fiscal year ended January 31, 2015 is as follows:
| Unreleased Restricted Stock Units |  | Weighted average grant date fair value
| (in thousands) |  |
Unreleased restricted stock units at January 31, 2014 | 6,515.6 |  |  | $ | 39.15 |
Granted | 4,481.8 |  |  | 54.17 |
Vested | (2,675.6 | ) |  | 37.36 |
Canceled/Forfeited | (445.8 | ) |  | 41.43 |
Performance Adjustment (1) | (74.7 | ) |  | 42.23 |
Unreleased restricted stock units at January 31, 2015 | 7,801.3 |  |  | $ | 48.46 |
_______________
(1) | Based on Autodesk's financial results for the performance period, the fiscal 2014 and 2013 performance stock units were earned at 65.8% and 92.3% of the target award, respectively. The vesting of the performance stock units is subject to the holders satisfying the remaining service condition of the awards.
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, 2015:
| (a) |  | (b) |  | (c) |
Plan category | Number of securities to be issued upon exercise of outstanding options |  | 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 | 10.5 |  |  | $ | 34.46 |  |  | 55.0 |  | (1)
Total | 10.5 |  |  | $ | 34.46 |  |  | 55.0 |  |
____________________
(1) | Included in this amount are 40.7 million securities available for future issuance under Autodesk’s ESP Plan.

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