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Stock-Based Compensation - Restricted Stock (Details) - Restricted stock and restricted stock units - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	Jan. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Balance as of the beginning of the period (in shares)	9,545,352
Granted - restricted stock and restricted stock units (in shares)	7,831,853
Vested and converted to shares (in shares)	(4,426,715)
Canceled (in shares)	(2,766,276)
Balance as of the end of period (in shares)	10,184,214	9,545,352
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Balance as of the beginning of the period (in dollars per share)	$ 16.71
Granted - restricted stock and restricted stock units (in dollars per share)	12.94	$ 15.52	$ 18.71
Vested and converted to shares (in dollars per share)	15.76
Canceled (in dollars per share)	16.09
Balance as of the end of period (in dollars per share)	$ 14.38	$ 16.71
Weighted average fair value vested (in dollars)	$ 69.8	$ 72.4	$ 54.7

X

- Definition

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

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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.

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

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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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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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