Stock-Based Awards - Summary of Stock-Based Awards Activity (Details) shares in Thousands	9 Months Ended
Oct. 31, 2020 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Options, Beginning Balance \| shares	87
Stock Options, Forfeited/expired \| shares	(49)
Stock Options, Ending Balance \| shares	38
Stock Options, Weighted Average Exercise Price, Beginning Balance \| $ / shares	$ 51.78
Stock Options, Weighted Average Exercise Price, Forfeited/expired \| $ / shares	51.47
Stock Options, Weighted Average Exercise Price, Ending Balance \| $ / shares	$ 52.20
Nonvested Stock Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Awards/ Share Units, Beginning Balance \| shares	2,312
Stock Awards/ Share Units, Granted \| shares	2,602
Stock Awards/ Share Units, Exercised/vested \| shares	(981)
Stock Awards/ Share Units, Forfeited/expired \| shares	(404)
Stock Awards/ Share Units, Ending Balance \| shares	3,529
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 56.24
Stock Awards/ Share Units, Awards/Units, Weighted Average Grant Date Fair Value, Granted \| $ / shares	20.24
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Exercised/vested \| $ / shares	53.47
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Forfeited/expired \| $ / shares	40.56
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 32.23
Performance Share Units [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock Awards/ Share Units, Beginning Balance \| shares	1,274
Stock Awards/ Share Units, Granted \| shares	735
Stock Awards/ Share Units, Exercised/vested \| shares	(826)
Stock Awards/ Share Units, Forfeited/expired \| shares	(25)
Stock Awards/ Share Units, Ending Balance \| shares	1,158
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Beginning Balance \| $ / shares	$ 61.55
Stock Awards/ Share Units, Awards/Units, Weighted Average Grant Date Fair Value, Granted \| $ / shares	21.12
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Exercised/vested \| $ / shares	42.72
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Forfeited/expired \| $ / shares	73.55
Stock Awards/ Share Units, Weighted Average Grant Date Fair Value, Ending Balance \| $ / shares	$ 49.03

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

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

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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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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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No definition available.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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