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Stock-based Compensation Expense (Tables) | 9 Months Ended
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Oct. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity | A summary of restricted stock activity for the nine months ended October 31, 2017 is as follows:
| Unvested Restricted Stock Units |  | Weighted average grant date fair value per share
| (in thousands) |  |
Unvested restricted stock units at January 31, 2017 | 7,622.4 |  |  | $ | 60.13 |
Granted | 2,036.6 |  |  | 106.45 |
Vested | (3,156.6 | ) |  | 57.21 |
Canceled/Forfeited | (534.3 | ) |  | 67.05 |
Performance Adjustment (1) | 24.7 |  |  | 61.79 |
Unvested restricted stock units at October 31, 2017 | 5,992.8 |  |  | $ | 78.94 |
_______________
(1) | Based on Autodesk's financial results and relative total stockholder return for the fiscal 2017 performance period. The performance stock units were attained at rates ranging from 99.7% to 114.7% of the target award.
Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity | A summary of the ESPP activity for three and nine months ended October 31, 2017 and 2016 is as follows:
|  | Three Months Ended October 31, |  | Nine Months Ended October 31,
|  | 2017 |  | 2016 |  | 2017 |  | 2016
Issued shares |  | 0.9 |  |  | 1.1 |  |  | 2.0 |  |  | 2.3 |
Average price of issued shares |  | $ | 39.92 |  |  | $ | 37.36 |  |  | $ | 39.03 |  |  | $ | 36.99 |
Weighted average grant date fair value of awards granted under the ESPP (1) |  | $ | 33.04 |  |  | $ | 20.75 |  |  | $ | 32.41 |  |  | $ | 19.20 |
_______________ (1) Calculated as of the award grant date using the Black-Scholes Merton (“BSM") option pricing model.
Schedule of Employee Service Share-based Compensation, Allocation of Recognized Period Costs | The following table summarizes stock-based compensation expense for the three and nine months ended October 31, 2017 and 2016, respectively, as follows:
| Three Months Ended October 31, |  | Nine Months Ended October 31,
| 2017 |  | 2016 |  | 2017 |  | 2016
Cost of maintenance and subscription revenue (1) | $ | 2.8 |  |  | $ | 2.2 |  |  | $ | 8.5 |  |  | $ | 6.2 |
Cost of license and other revenue (1) | 1.0 |  |  | 1.3 |  |  | 3.1 |  |  | 4.1 |
Marketing and sales | 27.7 |  |  | 24.2 |  |  | 80.1 |  |  | 69.0 |
Research and development | 20.1 |  |  | 20.9 |  |  | 61.7 |  |  | 60.0 |
General and administrative | 13.5 |  |  | 8.0 |  |  | 46.1 |  |  | 23.2 |
Stock-based compensation expense related to stock awards and ESPP purchases | 65.1 |  |  | 56.6 |  |  | 199.5 |  |  | 162.5 |
Tax benefit | (1.3 | ) |  | — |  |  | (1.6 | ) |  | — |
Stock-based compensation expense related to stock awards and ESPP purchases, net of tax | $ | 63.8 |  |  | $ | 56.6 |  |  | $ | 197.9 |  |  | $ | 162.5 |
_______________
(1) | Prior periods have been adjusted to conform with the current period's presentation. See Note 1, "Basis of Presentation," for additional information.
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award | Autodesk uses the following assumptions to estimate the fair value of stock-based awards:
| Three Months Ended October 31, 2017 |  | Three Months Ended October 31, 2016
| Performance Stock Unit (1) |  | ESPP |  | Performance Stock Unit (1) |  | ESPP
Range of expected volatilities | N/A |  | 31.7 - 33.4% |  | N/A |  | 31.0 - 33.9%
Range of expected lives (in years) | N/A |  | 0.5 - 2.0 |  | N/A |  | 0.5 - 2.0
Expected dividends | N/A |  | —% |  | N/A |  | —%
Range of risk-free interest rates | N/A |  | 1.2 - 1.4% |  | N/A |  | 0.5 - 0.8%
| Nine Months Ended October 31, 2017 |  | Nine Months Ended October 31, 2016
| Performance Stock Unit |  | ESPP |  | Performance Stock Unit |  | ESPP
Range of expected volatilities | 31.8% |  | 31.4 - 33.7% |  | 38.4 - 38.6% |  | 30.0 - 40.2%
Range of expected lives (in years) | N/A |  | 0.5 - 2.0 |  | N/A |  | 0.5 - 2.0
Expected dividends | —% |  | —% |  | —% |  | —%
Range of risk-free interest rates | 1.0 - 1.2% |  | 0.9 - 1.4% |  | 0.6 - 0.7% |  | 0.5 - 0.9%
_______________
(1) | Autodesk did not grant PSUs that were subject to market conditions in the three months ended October 31, 2017 or 2016.

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 + Details
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- Definition Tabular disclosure of employee stock purchase plan activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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