Share-Based Compensation (Restricted Stock Units Assumptions) (Details) - $ / shares	9 Months Ended
Oct. 31, 2020	Nov. 02, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Document Period End Date	Oct. 31, 2020
Fair value (in dollars per share)	$ 0
City Area Code	(614)
Market-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date market price (in dollars per share)	$ 12.31	$ 25.34
Fair value (in dollars per share)	$ 16.24	$ 36.24
Price volatility	67.00%	57.00%
Expected term (years)	2 years 4 months 24 days	2 years 10 months 24 days
Risk-free interest rate	0.20%	2.20%
Dividend yield	0.00%	3.20%
Average volatility of peer companies	66.00%	40.00%
Average correlation coefficient of peer companies	0.4967	0.2407

Share-based Compensation Assumption, Average Correlation Coefficient of Peer Companies

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- Definition

The assumption of average volatility of peer companies that is used in valuing an option or stock unit on its own shares.

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- Definition

Area code of city

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- Definition

The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD.

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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 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

The risk-free interest rate assumption that is used in valuing an option on its own shares.

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- Definition

Rate of weighted-average expected volatility for award under share-based payment arrangement.

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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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- 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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- Definition

Expected term of 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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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