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Common Stock, Capital Shares Reserved for Future Issuance or Issued

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Number of Plans

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Share Based Compensation Arrangement, By Share Based Payment Award Maximum Number Of Common Stock Value Per Employee

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Share-based Compensation Arrangement by Share-based Payment Award, Value Withheld For Future Purchases

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Share Based Compensation Arrangement by Share Based Payment Award, Maximum Ownership Percentage per Employee

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Share Based Compensation Arrangement by Share Based Payment Award, Minimum Work Hours per Week for Eligibility

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Share Based Compensation, Weighted Average Period

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Share-based Compensation Arrangement by Share-based Payment Award Amount Reserved for Share Purchases

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Share-based Compensation Arrangement by Share-based Payment Award, Initial Period for Increasing Shares under Plan

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Share-based Compensation Arrangement by Share-based Payment Award, Share Purchase Period

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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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The highest quantity of shares an employee can purchase under the plan per period.

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

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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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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- Definition

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 options outstanding, including both vested and non-vested options.

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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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Percentage of vesting of 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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Stock Option Plans - Narrative (Details)			1 Months Ended	12 Months Ended
Stock Option Plans - Narrative (Details)	Feb. 01, 2020 shares	Jan. 03, 2019 USD ($)	Mar. 31, 2017 shares	Jan. 31, 2020 USD ($) hour plan $ / shares shares	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of plans \| plan				2
Shares reserved and available for future issuance (in shares) \| shares				13,530,363	19,117,696
Stock-based compensation				$ 20,900,000	$ 6,200,000
Award expiration period (in years)				10 years
Intrinsic value of exercised options				$ 26,200,000	31,200,000	$ 64,100,000
Grant date fair value				1,600,000	$ 27,900,000	$ 15,200,000
Weighted average grant date value of employee options (in dollars per share) \| $ / shares					$ 4.58	$ 8.67
Unamortized stock based compensation expense				$ 300,000
Average remaining vesting period (in years)				9 months 18 days
Share-based compensation arrangement by share-based payment award, value withheld for future purchases				$ 2,700,000
Employee stock purchase plan withholdings				$ 2,732,000	$ 1,902,000
Employee Stock Option \| After one year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				1 year
Award vesting (as a percent)				25.00%
Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Average remaining vesting period (in years)				2 years 2 months 12 days
Granted (in dollars per share) \| $ / shares				$ 8.96	$ 12.08	$ 16.93
Fair value of RSUs vested during period				$ 218,300,000	$ 128,700,000	$ 166,700,000
Unamortized stock based compensation expense RSUs				$ 366,600,000
Restricted stock awards \| After one year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				1 year
Award vesting (as a percent)				25.00%
Restricted stock awards \| Remaining three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Minimum \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Minimum \| Employee Stock Option \| Remaining three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				2 years
Minimum \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Maximum \| Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Maximum \| Employee Stock Option \| Remaining three years
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Maximum \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Equity Incentive Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restriction on increase to shares outstanding (as a percent)			5.00%
Increase in shares reserved for grant (in shares) \| shares	14,758,388
Shares reserved and available for future issuance (in shares) \| shares				13,269,006
Employee Stock Purchase Plan 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common issued or reserved for issuance (in shares) \| shares			30,000,000
Restriction on increase to shares outstanding (as a percent)				1.00%
Share purchase period (in years)				6 months
Minimum weekly hours worked for plan eligibility \| hour				20
Minimum months worked for plan eligibility				5 months
Maximum ownership interest for plan participation (as a percent)				5.00%
Purchase price (as a percent)				85.00%
Maximum stock value purchased				$ 25,000
Maximum shares purchased (in shares) \| shares				2,500
Reserved for issuance under plans (in shares) \| shares	2,951,677			3,000,000
Years for increasing shares included in plan				10 years
Shares available for grant (in shares) \| shares				2,905,694
Employee Stock Purchase Plan 2017 \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum payroll deduction (as a percent)				1.00%
Employee Stock Purchase Plan 2017 \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum payroll deduction (as a percent)				15.00%
Equity Incentive Plan 2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation						$ 181,500,000
Equity Incentive Plan 2008 \| Minimum \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Equity Incentive Plan 2008 \| Maximum \| Restricted stock awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				4 years
Hortonworks, Inc
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of stock awards assumed		$ 63,500,000
Share based compensation, weighted average period		1 year 6 months
Stock-based compensation					$ 13,100,000
Average remaining vesting period (in years)		1 year 6 months