Stock-based Compensation Expense (Tables)

6 Months Ended

Jul. 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 six months ended July 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	815.8		93.97
Vested	(1,269.2	)	58.17
Canceled/Forfeited	(331.4	)	61.31
Performance Adjustment (1)	24.7		61.79
Unvested restricted stock units at July 31, 2017	6,862.3		$	65.30

 _______________

(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 Employee Service Share-based Compensation, Allocation of Recognized Period Costs

The following table summarizes stock-based compensation expense for the six months ended July 31, 2017 and 2016, respectively, as follows:

	Three Months Ended July 31,					Six Months Ended July 31,
	2017			2016		2017			2016
Cost of maintenance and subscription revenue (1)	$	2.9		$	2.0	$	5.7		$	4.0
Cost of license and other revenue (1)	1.0			1.4		2.1			2.8
Marketing and sales	26.0			23.3		52.4			44.8
Research and development	20.4			20.2		41.6			39.1
General and administrative	17.3			7.4		32.6			15.2
Stock-based compensation expense related to stock awards and ESPP purchases	67.6			54.3		134.4			105.9
Tax benefit	(0.3		)	—		(0.3		)	—
Stock-based compensation expense related to stock awards and ESPP purchases, net of tax	$	67.3		$	54.3	$	134.1		$	105.9

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(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 July 31, 2017		Three Months Ended July 31, 2016
	Performance Stock Unit	ESPP (1)	Performance Stock Unit (2)	ESPP (1)
Range of expected volatilities	31.8%	N/A	N/A	N/A
Range of expected lives (in years)	N/A	N/A	N/A	N/A
Expected dividends	—%	N/A	N/A	N/A
Range of risk-free interest rates	1.2%	N/A	N/A	N/A
	Six Months Ended July 31, 2017		Six Months Ended July 31, 2016
	Performance Stock Unit	ESPP	Performance Stock Unit	ESPP
Range of expected volatilities	31.8%	31.4 - 33.7%	38.4 - 38.6%	35.0 - 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 - 1.3%	0.6 - 0.7%	0.5 - 0.9%

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(1) Autodesk does not issue any shares under its ESPP in the second or fourth quarter.

(2) Autodesk did not grant PSUs in the three months ended July 31, 2016 that were subject to market conditions.