Equity Incentive Plans (Tables)

12 Months Ended

Jan. 31, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity Under Equity Incentive Plans and Related Information

A summary of the stock option activity under our equity incentive plans and related information is as follows:

	Options Outstanding
	Number of Shares	Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value (in thousands)
Balance at the end of fiscal 2020	26,822,243	$	8.97	3.9	$	237,803
Options assumed in an acquisition	1,891,349	1.75
Options exercised	(9,734,153)	6.11
Options forfeited/canceled	(420,465)	14.77
Balance at the end of fiscal 2021	18,558,974	$	9.60	4.3	$	251,503
Vested and exercisable at the end of fiscal 2021	16,016,719	$	9.92	3.8	$	211,566

Summary of Estimate Fair Value of Employee Stock Options and Employee Purchase Plan

assumptions used for the periods presented are as follows:

	Fiscal Year Ended
	2019	2020	2021
Employee Stock Options
Expected term (in years)	n/a	n/a	5.65
Expected volatility	n/a	n/a	52.07%
Risk-free interest rate	n/a	n/a	0.3%
Dividend rate	n/a	n/a	—
Fair value of common stock	n/a	n/a	$15.79
Employee Stock Purchase Plan
Expected term (in years)	0.5 - 2.0	0.5 - 2.0	0.5 - 2.0
Expected volatility	44% - 47%	42% - 47%	52% - 113%
Risk-free interest rate	2.0% - 2.8%	1.7% - 2.5%	0.1% - 0.4%
Dividend rate	—	—	—
Fair value of common stock	$20.62 - $27.66	$17.76 - $20.87	$9.07 - $15.26

Schedule of Share-based Compensation, Restricted Stock Units Award Activity

A summary of the RSU activity under our equity incentive plans and related information is as follows:

	Number of RSUs Outstanding	Weighted-Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Unvested balance at the end of fiscal 2020	25,434,597	$	18.72	$	452,736
Granted	18,414,274	12.61
Assumed in an acquisition	2,016,061	15.79
Vested	(11,240,616)	16.90
Forfeited	(3,794,234)	16.82
Unvested balance at the end of fiscal 2021	30,830,082	$	15.77	$	712,657

Schedule of Restricted Stock Activity

A summary of the restricted stock activity under our 2015 Plan and related information is as follows:

	Number of Restricted Stock Outstanding	Weighted- Average Grant Date Fair Value		Aggregate Intrinsic Value (in thousands)
Unvested balance at the end of fiscal 2020	2,127,206	$	19.58	$	37,864
Vested	(1,252,405)	19.61
Forfeited/canceled	(316,965)	20.38
Unvested balance at the end of fiscal 2021	557,836	$	19.06	$	12,903

Summarizes the Components of Stock-Based Compensation

The following table summarizes the components of stock-based compensation expense recognized in the consolidated statements of operations (in thousands):

	Fiscal Year Ended
	2019		2020		2021
Cost of revenue—product	$	2,951	$	3,732	$	4,001
Cost of revenue—subscription services	12,378		14,403		14,979
Research and development	92,484		107,658		117,220
Sales and marketing	66,350		67,560		65,248
General and administrative	36,482		33,352		40,896
Total stock-based compensation expense	$	210,645	$	226,705	$	242,344