Modification charge related to the ESPP reset.

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Employee stock purchase plan offering period.

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Number of equity compensation plans.

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Number of Purchase Periods

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Purchase Period, Term

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Share-based Compensation Arrangement by Share-based Payment Award, Dollar Cap Per Purchase Period

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Share cap for ESPP at each purchase date.

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Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Converted In Period

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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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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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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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 number of grants made 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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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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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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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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Number of shares authorized for issuance under share-based payment arrangement.

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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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Maximum number of shares that may be issued in accordance with the plan as a proportion of outstanding capital stock.

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Price of a single share of a number of saleable stocks of a company.

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

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Amount of cost expensed and capitalized for award under share-based payment arrangement.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Equity Incentive Plans - Additional Information (Details)	1 Months Ended	12 Months Ended
	Feb. 28, 2019 USD ($)	Feb. 06, 2022 USD ($) period plan $ / shares shares	Jan. 31, 2021 USD ($)	Feb. 02, 2020 USD ($)	Jan. 31, 2017 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of equity incentive plans \| plan		2
Shares reserved for future equity awards (in shares) \| shares		63,667,347
Total stock-based compensation expense		$ 286,963,000	$ 242,344,000	$ 226,705,000
Closing price of stock (in dollars per share) \| $ / shares		$ 26.38
Stock options to purchase common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future equity awards (in shares) \| shares		17,402,448
Total stock-based compensation expense		$ 7,700,000	8,600,000	15,800,000
Unrecognized compensation cost related to stock awards, weighted-average period		1 year 7 months 6 days
Intrinsic value of exercised options		$ 105,100,000	118,800,000	106,600,000
Total grant date fair value of options vested		16,500,000	$ 20,100,000	$ 34,200,000
Unrecognized compensation cost		$ 7,500,000
Dividend rate			0.00%
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend rate		0.00%	0.00%	0.00%
Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares) \| shares		1,600,373
Award vesting rights, percentage		100.00%
Earned (in shares) \| shares		2,028,355
Unvested RSUs and PRSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense		$ 242,100,000	$ 199,100,000	$ 161,800,000
Unrecognized compensation cost related to stock awards, weighted-average period		2 years 8 months 12 days
Granted (in shares) \| shares		17,173,968
Aggregate fair value of awards vested during the period		$ 322,200,000	183,400,000	164,100,000
Unrecognized employee compensation cost		503,200,000
Unvested restricted stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation expense		$ 1,800,000	9,300,000	24,600,000
Unrecognized compensation cost related to stock awards, weighted-average period		1 month 6 days
Aggregate fair value of awards vested during the period		$ 10,400,000	18,300,000	24,200,000
Minimum \| Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage		0.00%
Maximum \| Performance RSUs
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting rights, percentage		150.00%
Common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Closing price of stock (in dollars per share) \| $ / shares		$ 26.38
2015 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity awards of vest expire period		10 years
2015 Equity Incentive Plan \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity awards vesting period		2 years
2015 Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Equity awards vesting period		4 years
2015 Equity Incentive Plan \| Common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares initially reserved for issuance (in shares) \| shares		27,000,000
Equity incentive plan, period in force		10 years
Increase in shares reserved by percentage of capital stock		5.00%
2015 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares reserved for future equity awards (in shares) \| shares		5,000,000
Employee stock purchase plan offering period		24 months
Number of purchase periods \| period		4
Purchase period, term		6 months
ESPP modification charge		$ 0	23,800,000	13,600,000
Total stock-based compensation expense		35,400,000	25,800,000	$ 24,500,000
Unrecognized stock-based compensation expense		$ 9,900,000
Unrecognized compensation cost related to stock awards, weighted-average period		9 months 18 days
2015 Employee Stock Purchase Plan \| Common stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Increase in shares reserved by percentage of capital stock					1.00%
Shares reserved for future equity awards (in shares) \| shares					3,500,000
Payroll deductions percentage		30.00%
Share cap for ESPP at purchase date (in shares) \| shares		3,000
Dollar cap per purchase period	$ 7,500
Calendar year gap for ESPP contribution amount			$ 25,000
Purchase price as percentage of fair market value of common stock		85.00%