Shareholders' Equity (Details 2) - $ / shares	12 Months Ended
Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Number of Shares
Restricted shares outstanding at end of fiscal year	228,682
Performance shares
Number of Shares
Restricted shares outstanding at end of fiscal year	30,000
Weighted-average grant date fair value
Restricted shares granted (in dollars per share)	$ 76
Restricted share units
Number of Shares
Restricted shares outstanding at end of fiscal year	33,780
Weighted-average grant date fair value
Restricted shares granted (in dollars per share)	$ 60
Long-Term Stock Incentive Plan
Shareholders Equity
Share awards available for issuance	1,000,000
Additional grants available under the previous plans (in shares)	0
Long-Term Stock Incentive Plan \| Restricted share
Number of Shares
Restricted shares outstanding at beginning of fiscal year	175,886	91,172	56,521
Restricted shares granted	44,437	23,637	35,641
Restricted shares vested, including restricted shares repurchased from employees for employees' tax liability	(58,711)	(4,645)	0
Restricted shares forfeited	(19,939)	(21,431)	(990)
Restricted shares outstanding at end of fiscal year	228,682	175,886	91,172
Weighted-average grant date fair value
Restricted shares outstanding at beginning of fiscal year (in dollars per share)	$ 67	$ 59	$ 47
Restricted shares granted (in dollars per share)	73	60	78
Restricted shares vested, including restricted shares repurchased from employees for employees' tax liability (in dollars per share)	51	64	0
Restricted shares forfeited (in dollars per share)	67	70	78
Restricted shares outstanding at end of fiscal year (in dollars per share)	$ 69	$ 67	$ 59
Long-Term Stock Incentive Plan \| Restricted share \| Minimum
Shareholders Equity
Vesting period	3 years
Long-Term Stock Incentive Plan \| Restricted share \| Maximum
Shareholders Equity
Vesting period	4 years
Long-Term Stock Incentive Plan \| Restricted share units
Number of Shares
Restricted shares granted	87,009	87,153	0
Weighted-average grant date fair value
Restricted shares granted (in dollars per share)	$ 58	$ 78	$ 0

Represents the additional number of shares available for grant under the plan.

No definition available.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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No definition available.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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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No definition available.

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- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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