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Stock-based Compensation (Deferred Compensation Arrangements) (Narrative) (Details)	12 Months Ended
	Jan. 31, 2021 yearOld shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Number of shares of common stock each deferred share entitled to | shares	1
Restricted Stock Units (RSUs)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Age at which award becomes non-forfeitable | yearOld	60
Award requisite service period	5 years

X

- Definition

The number of shares of common stock each deferred share is entitled to at conversion.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Age when share-based compensation award may become non-forfeitable.

+ References

No definition available.

+ Details

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X

- 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.

+ References

No definition available.

+ Details

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X

- Definition

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.

+ 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 (a)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Details

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