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Stock-based Compensation Expense | 9 Months Ended
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Oct. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based Compensation Expense | Stock-based Compensation Expense Restricted Stock Units: A summary of restricted stock unit activity for the nine months ended October 31, 2016 is as follows:
| Unvested Restricted Stock Units |  | Weighted average grant date fair value per share
| (in thousands) |  |
Unvested restricted stock units at January 31, 2016 | 7,739.6 |  |  | $ | 51.80 |
Granted | 3,661.7 |  |  | 63.77 |
Vested | (2,848.8 | ) |  | 50.46 |
Canceled/Forfeited | (609.6 | ) |  | 52.53 |
Performance Adjustment (1) | (29.7 | ) |  | 63.81 |
Unvested restricted stock units at October 31, 2016 | 7,913.2 |  |  | $ | 58.41 |
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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.
The fair value of the shares vested during the nine months ended October 31, 2016 and 2015 was $180.3 million and $156.6 million, respectively. During the nine months ended October 31, 2016, Autodesk granted 3.2 million restricted stock units. Autodesk recorded stock-based compensation expense related to restricted stock units of $45.2 million and $37.9 million during the three months ended October 31, 2016 and 2015, respectively. Autodesk recorded stock-based compensation expense related to restricted stock units of $125.5 million and $103.7 million during the nine months ended October 31, 2016 and 2015, respectively. During the nine months ended October 31, 2016, Autodesk granted 0.4 million performance stock units (“PSUs”) for which the ultimate number of shares earned is determined based on the achievement of performance criteria at the end of the stated service and performance period. The performance criteria for these grants are based upon net new model subscription additions, new model Annualized Recurring Revenue ("ARR"), non-GAAP total spend, and total subscription renewal rate goals ("FY17 performance criteria") adopted by the Compensation and Human Resource Committee, as well as total stockholder return compared against companies in the S&P Computer Software Select Index (“Relative TSR”). Each PSU covers a three-year period:
• | Up to one third of the PSUs may vest following year one, depending upon the achievement of the FY17 performance criteria as well as 1-year Relative TSR (covering year one).
• | Up to one third of the PSUs may vest following year two, depending upon the achievement of the performance criteria for year two as well as 2-year Relative TSR (covering years one and two).
• | Up to one third of the PSUs may vest following year three, depending upon the achievement of the performance criteria for year three as well as 3-year Relative TSR (covering years one, two and three).
PSUs are not considered outstanding stock at the time of grant, as the holders of these units are not entitled to any of the rights of a stockholder, including voting rights. Autodesk has determined the grant date fair value for these awards using a Monte Carlo simulation model since the awards are also subject to a market condition. The fair value of the PSUs is expensed using the accelerated attribution over the vesting period. Autodesk recorded stock-based compensation expense related to PSUs of $4.9 million and $5.7 million for the three months ended October 31, 2016 and 2015, respectively. Autodesk recorded stock-based compensation expense related to PSUs of $17.1 million and $17.2 million for the nine months ended October 31, 2016 and 2015, respectively. 1998 Employee Qualified Stock Purchase Plan (“ESPP”) Under Autodesk’s ESPP, which was approved by stockholders in 1998, eligible employees may purchase shares of Autodesk’s common stock at their discretion using up to 15% of their eligible compensation, subject to certain limitations, at 85% of the lower of Autodesk's closing price (fair market value) on the offering date or the exercise date. The offering period for ESPP awards consists of four, six-month exercise periods within a 24-month offering period. Autodesk issued 1.1 million and 1.0 million shares under the ESPP during the three months ended October 31, 2016 and 2015, respectively, with an average price of $37.36 and $35.59 per share. The weighted average grant date fair value of awards granted under the ESPP was $20.75 and $11.91 during the three months ended October 31, 2016 and 2015, respectively, calculated as of the award grant date using the Black-Scholes Merton (“BSM") option pricing model. Autodesk issued 2.3 million and 2.1 million shares under the ESPP during the nine months ended October 31, 2016 and 2015, respectively, with an average price of $36.99 and $36.29 per share. The weighted average grant date fair value of awards granted under the ESPP was $19.20 and $11.85 during the nine months ended October 31, 2016 and 2015, respectively, in each case, calculated as of the award grant date using the BSM option pricing model. Stock-based Compensation Expense The following table summarizes stock-based compensation expense for the three and nine months ended October 31, 2016 and 2015, respectively, as follows:
| Three Months Ended October 31,
| 2016 |  | 2015
Cost of subscription | $ | 1.7 |  |  | $ | 1.5 |
Cost of license and other revenue | 1.8 |  |  | 1.7 |
Marketing and sales | 24.2 |  |  | 22.3 |
Research and development | 20.9 |  |  | 17.5 |
General and administrative | 8.0 |  |  | 7.2 |
Stock-based compensation expense related to stock awards and ESPP purchases, net of tax | $ | 56.6 |  |  | $ | 50.2 |
| Nine Months Ended October 31,
| 2016 |  | 2015
Cost of subscription | $ | 5.2 |  |  | $ | 4.1 |
Cost of license and other revenue | 5.1 |  |  | 4.4 |
Marketing and sales | 69.0 |  |  | 61.3 |
Research and development | 60.0 |  |  | 49.9 |
General and administrative | 23.2 |  |  | 21.4 |
Stock-based compensation expense related to stock awards and ESPP purchases, net of tax | $ | 162.5 |  |  | $ | 141.1 |
Stock-based Compensation Expense Assumptions Autodesk determines the grant date fair value of its share-based payment awards using a BSM option pricing model or the quoted stock price on the date of grant, unless the awards are subject to market conditions, in which case Autodesk uses a binomial-lattice model (e.g., Monte Carlo simulation model). The Monte Carlo simulation model utilizes multiple input variables to estimate the probability that market conditions will be achieved. Autodesk uses the following assumptions to estimate the fair value of stock-based awards:
| Three Months Ended October 31, 2016 |  | Three Months Ended October 31, 2015
| Performance Stock Unit (1) |  | ESPP |  | Performance Stock Unit (1) |  | ESPP
Range of expected volatilities | N/A |  | 31.0 - 33.9% |  | N/A |  | 28.6 - 28.9%
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 |  | 0.5 - 0.8% |  | N/A |  | 0.2 - 0.7%
| Nine Months Ended October 31, 2016 |  | Nine Months Ended October 31, 2015
| Performance Stock Unit |  | ESPP |  | Performance Stock Unit |  | ESPP
Range of expected volatilities | 38.4 - 38.6% |  | 30.0 - 40.2% |  | 27.3% |  | 27.7 - 28.9%
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 | 0.6 - 0.7% |  | 0.5 - 0.9% |  | 0.2% |  | 0.1 - 0.7%
____________________
(1) | Autodesk did not grant PSUs in the three months ended October 31, 2016 and 2015 that were subject to market conditions.
Autodesk estimates expected volatility for stock-based awards based on the average of the following two measures: (1) a measure of historical volatility in the trading market for the Company’s common stock, and (2) the implied volatility of traded forward call options to purchase shares of the Company’s common stock. The expected volatility for PSUs subject to market conditions includes the expected volatility of Autodesk's peer companies within the S&P Computer Software Select Index. The range of expected lives of ESPP awards are based upon the four, six-month exercise periods within a 24-month offering period. Autodesk does not currently pay, and does not anticipate paying in the foreseeable future, any cash dividends. Consequently, an expected dividend yield of zero is used in the BSM option pricing model and the Monte Carlo simulation model. The risk-free interest rate used in the BSM option pricing model and the Monte Carlo simulation model for stock-based awards is the historical yield on U.S. Treasury securities with equivalent remaining lives. Autodesk recognizes expense only for the stock-based awards that ultimately vest. As permitted by ASU 2016-09, Autodesk has elected to account for forfeitures of our stock-based awards as those forfeitures occur.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 40 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65895303&loc=d3e17540-113929 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68057994&loc=d3e25284-112666 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) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 4: 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=6415400&loc=d3e5070-113901 Reference 5: 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=6415400&loc=d3e5047-113901 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5444-113901 + Details
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