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Stock-Based Compensation - Summary of Restricted Stock Unit Activity Under Equity Incentive Plans and Related Information (Details) - Restricted Stock Units	9 Months Ended
	Oct. 31, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of Restricted Stock Units Outstanding, Unvested Beginning Balance | shares	18,098,707
Number of Restricted Stock Units, Granted | shares	11,032,086
Number of Restricted Stock Units, Vested, net of shares withheld for employee payroll taxes | shares	(3,275,859)
Number of Restricted Stock Units, Forfeited/cancelled | shares	(3,320,045)
Number of Restricted Stock Units, Unvested Ending Balance | shares	22,534,889
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted-Average Grant Date Fair Value, Unvested Beginning Balance | $ / shares	$ 19.35
Weighted-Average Grant Date Fair Value, Granted | $ / shares	19.02
Weighted-Average Grant Date Fair Value, Vested | $ / shares	20.00
Weighted-Average Grant Date Fair Value, Forfeited/cancelled | $ / shares	19.68
Weighted-Average Grant Date Fair Value, Unvested Ending Balance | $ / shares	$ 19.04

X

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

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-Publisher FASB
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-Paragraph 2
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X

- Definition

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).

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

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).

+ References

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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

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-Publisher FASB
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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-Publisher FASB
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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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-Publisher FASB
-Name Accounting Standards Codification
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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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