Stockholders' Equity (Tables)

12 Months Ended

Jan. 31, 2022

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity

A summary of stock option activity for the fiscal year ended January 31, 2022 is as follows: 

	Number of shares	Weighted average exercise price		Weighted average remaining contractual term (in years)	Aggregate intrinsic value (in millions)
Options outstanding at January 31, 2021	12,761,289	$	57.48	5.0	$	2,794
Options granted	1,155,396	277.06
Options exercised	(1,476,898)	34.90
Options forfeited/cancelled	(349,265)	172.64
Options outstanding at January 31, 2022	12,090,522	$	77.89	4.6	$	1,964
Options vested and exercisable at January 31, 2022	7,203,834	$	32.35	2.8	$	1,472
Options vested and exercisable at January 31, 2022 and expected to vest thereafter	12,090,522	$	77.89	4.6	$	1,964

Schedule of Weighted-Average Assumptions Used to Estimate Grant Date Fair Value of Options Granted

The following table presents the weighted-average assumptions used to estimate the grant date fair value of options granted during the periods presented:

	Fiscal year ended January 31,
	2022			2021			2020
Volatility	37%	-	39%	39%	-	42%	39%	-	41%
Expected term (in years)	6.25			6.25	-	7.25	5.64	-	6.61
Risk-free interest rate	0.70%	-	1.60%	0.33%	-	1.43%	1.39%	-	2.52%
Dividend yield	—%			—%			—%

Summary of Restricted Stock Unit (RSU) Activity

A summary of RSU activity for the fiscal year ended January 31, 2022 is as follows:

	Unreleased restricted stock units	Weighted  average grant date fair value
Balance at January 31, 2021	1,032,215	$	121.98
RSUs granted	518,172	277.79
RSUs vested	(854,536)	173.01
RSUs forfeited / cancelled	(76,463)	175.88
Balance at January 31, 2022	619,388	175.23