Shareholders' Equity and Equity Compensation - Restricted shares and restricted share units (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	12 Months Ended
Aug. 01, 2020	Jan. 30, 2021
Restricted shares and restricted share units \| Officers and other key employees
Shareholders Equity
Number of Shares		391,714
Average Market Price on Date of Grant (in dollars per share)		$ 59
Unrecognized compensation expense related to unvested share-based restricted stock awards and the unvested restricted share units (in dollars)		$ 11
Weighted average remaining life of the outstanding awards		2 years
Restricted share awards \| Officers and other key employees
Shareholders Equity
Number of Shares		308,369
Average Market Price on Date of Grant (in dollars per share)		$ 61
Restricted share awards, Vesting in April 2021 \| Officers and other key employees
Shareholders Equity
Number of Shares		82,513
Average Market Price on Date of Grant (in dollars per share)		$ 77
Restricted share awards, Vesting in April 2022 \| Officers and other key employees
Shareholders Equity
Number of Shares		95,861
Average Market Price on Date of Grant (in dollars per share)		$ 77
Restricted share award, Vesting based on service, Vesting in July 2023 \| Officers and other key employees
Shareholders Equity
Number of Shares		129,995
Average Market Price on Date of Grant (in dollars per share)		$ 40
TSR-based restricted share units
Shareholders Equity
Restricted share awards earned (in shares)	100,000
TSR-based restricted share units \| Officers and other key employees
Shareholders Equity
Number of Shares		83,345
Average Market Price on Date of Grant (in dollars per share)		$ 50

Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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

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- 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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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.

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-Publisher FASB
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- Definition

Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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