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Stockholders' Equity (Tables)

12 Months Ended

Jan. 31, 2021

Equity [Abstract]

Share of Common Stock Reserved For Future Issuance

We have reserved the following shares of common stock, on an as-if converted basis, for future issuance as follows:

			January 31,
(in thousands)			2021						2020
RSUs outstanding			10,962						14,246
Options issued and outstanding			4,798						6,882
Remaining shares available for future issuance under the Equity Incentive Plans			32,901						24,726
Remaining shares available for future issuance under the ESPP			6,329						4,985
Total shares of common stock reserved			54,990						50,839

Share-based Compensation, Activity

Shares available for grant under the 2018 Plan for the year ended January 31, 2021 was as follows:

(in thousands)			Year Ended January 31, 2021
Available at beginning of fiscal year			24,726
Awards authorized			9,063
Shares granted			(4,032)
Shares cancelled/expired			886
Shares withheld for taxes			2,258
Available at end of fiscal year			32,901

RSU Activity

RSU activity for the year ended January 31, 2021 was as follows:

(in thousands, except per share data)			Number of Units						Weighted-Average Grant Date Fair Value
Unvested at January 31, 2020			13,859						$	46.28
Granted			4,022						144.80
Vested			(6,318)						44.67
Canceled			(977)						53.81
Unvested at January 31, 2021			10,586						$	83.98

Options Activity

Option activity for the year ended January 31, 2021 was as follows:

(in thousands, except per share data and years)			Number of Options						Weighted-Average Exercise Price Per Share						Weighted-Average Remaining Contractual Term (Years)						Aggregate Intrinsic Value
Outstanding at January 31, 2020			6,882						$	14.39					5.38						$	441,247
Issued as consideration for acquisition			9						22.22
Exercised			(2,072)						11.71
Canceled/expired			(21)						18.09
Outstanding at January 31, 2021			4,798						$	15.55					5.03						$	1,042,879
Vested and expected to vest at January 31, 2021			4,798						$	15.55					5.03						$	1,042,801
Exercisable at January 31, 2021			4,761						$	15.54					5.02						$	1,034,740

ESPP Valuation Assumptions

We calculated the fair value of the ESPP purchase right using the Black-Scholes option-pricing model, based on the following assumptions:

			Year Ended January 31,
			2021						2020						2019
Risk-free interest rate			0.11% - 0.17%						1.92% - 2.52 %						2.33 %
Expected dividend yield			—		%				—		%				—		%
Expected life of purchase right (in years)			0.5						0.5						0.5
Expected volatility			47% - 58%						39% - 52 %						40 %
Weighted-average grant date fair value per share			$90.15 - $221.20						$ 14.88 - $18.56						$ 14.24

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Tabular disclosure of the changes in outstanding nonvested restricted stock units.

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Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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