Capital Shares Reserved for Future Issuance, Annual Increase, Percentage of Stock Outstanding

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Common Stock, Additional Capital Shares Reserved For Future Issuance

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Share-Based Compensation Arrangement By Share-based Payment Award, Consecutive Offering Period

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Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Plans

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Amount of additional cost recognized for award under share-based payment arrangement from occurrence of event accelerating recognition of cost.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of shares issued under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Purchase price of common stock expressed as a percentage of its fair value.

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Number of shares issued during the period as a result of the conversion of convertible securities.

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The number of securities classified as temporary equity that have been sold (or granted) to the entity's shareholders. Securities issued include securities outstanding and securities held in treasury. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer.

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Stockholders' Equity - Narrative (Details) $ / shares in Units, $ in Thousands			12 Months Ended
	May 01, 2018 shares	Apr. 26, 2018 USD ($)	Jan. 31, 2020 USD ($) plan $ / shares shares	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) $ / shares	Feb. 01, 2020 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Redeemable convertible preferred stock, shares issued (in shares)	100,200,000
Number of stock-based compensation plans \| plan			3
Weighted-average grant date fair value (in usd per share) \| $ / shares					$ 7.41
Unrecognized compensation cost, options \| $			$ 5,700
Intrinsic value of options exercised \| $			83,600	$ 171,600	$ 325,700
Grant date fair value of options vested \| $			$ 33,600	25,800	10,500
Percent of purchase price of fair value of common stock			85.00%
Shares issued for ESPP during period (in shares)			500,000
Employee stock purchase plan, compensation expense \| $			$ 206,404	$ 410,978	$ 29,747
Reserved for future issuance (in shares)			50,839,000	52,525,000
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost, remaining weighted-average period for recognition			1 year
ESPP offering period			6 months
Reserved for future issuance (in shares)			6,882,000	13,648,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			4 years
Unrecognized compensation cost, remaining weighted-average period for recognition			2 years 3 months 18 days
Accelerated share based compensation expense \| $		$ 262,800
Grant date fair value \| $			$ 223,000	$ 260,800
Shares settled (in shares)			7,454,000	0
Weighted average grant date fair value of RSUs (in usd per share) \| $ / shares			$ 56.05	$ 53.77	$ 17.04
Unrecognized compensation cost, RSUs \| $			$ 465,300
Reserved for future issuance (in shares)			14,246,000	17,558,000
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase in shares reserved, percentage of total shares			1.00%
Increase in shares reserved for issuance (in shares)			3,800,000
Weighted average grant date fair value of RSUs (in usd per share) \| $ / shares				$ 14.24
Employee contribution, maximum percentage of earnings			15.00%
ESPP offering period		6 months
Employee stock purchase plan, compensation expense \| $			$ 8,900	$ 2,900
Reserved for future issuance (in shares)			4,985,000	3,800,000
2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual increase in shares reserved, percentage of total shares			5.00%
2018 Plan \| RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Annual vesting percentage			25.00%
Vesting period			1 year
Subsequent Event \| 2018 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in shares reserved for issuance (in shares)						9,100,000
Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued upon conversion (in shares)	100,400,000			100,350,000
Shares settled (in shares)			4,706,000	8,126,000