Share Based Compensation (Restricted Stock Unit Activity) (Details) (USD $)	12 Months Ended
Jan. 31, 2015	Feb. 01, 2014
Market-based Restricted Stock Units (RSUs) [Member]
Number of Underlying Shares Outstanding [Roll Forward]
Number of Underlying Shares, Outstanding, Ending Balance (in shares)	36,374	0
Number of Underlying Shares, Granted (in shares)	88,500
Number of Underlying Shares, Change due to performance criteria achievement (in shares)	0
Number of Underlying Shares, Vested (in shares)	0
Number of Underlying Shares, Forfeited (in shares)	(52,126)
Weighted-Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Granted (in dollars per share)	$ 42.44
Weighted-Average Grant Date Fair Value, Change due to performance achievement criteria (in dollars per share)	$ 0.00
Weighted-Average Grant Date Fair Value, Vested (in dollars per share)	$ 0.00
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share)	$ 44.05
Weighted-Average Grant Date Fair Value, Unvested, Outstanding (in dollars per share)	$ 40.13	$ 0.00
Service-based Restricted Stock Unit (RSUs) [Member]
Number of Underlying Shares Outstanding [Roll Forward]
Number of Underlying Shares, Outstanding, Ending Balance (in shares)	1,566,272	1,162,825
Number of Underlying Shares, Granted (in shares)	1,019,363
Number of Underlying Shares, Vested (in shares)	(355,796)
Number of Underlying Shares, Forfeited (in shares)	(260,120)
Weighted-Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Granted (in dollars per share)	$ 32.45
Weighted-Average Grant Date Fair Value, Vested (in dollars per share)	$ 48.00
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share)	$ 44.59
Weighted-Average Grant Date Fair Value, Unvested, Outstanding (in dollars per share)	$ 37.81	$ 47.15
Performance-based Restricted Stock Units (RSUs) [Member]
Number of Underlying Shares Outstanding [Roll Forward]
Number of Underlying Shares, Outstanding, Ending Balance (in shares)	205,420	263,754
Number of Underlying Shares, Granted (in shares)	177,006
Number of Underlying Shares, Change due to performance criteria achievement (in shares)	(98,483)
Number of Underlying Shares, Vested (in shares)	(10,002)
Number of Underlying Shares, Forfeited (in shares)	(126,855)
Weighted-Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Granted (in dollars per share)	$ 26.61
Weighted-Average Grant Date Fair Value, Change due to performance achievement criteria (in dollars per share)	$ 44.51
Weighted-Average Grant Date Fair Value, Vested (in dollars per share)	$ 51.50
Weighted-Average Grant Date Fair Value, Forfeited (in dollars per share)	$ 31.71
Weighted-Average Grant Date Fair Value, Unvested, Outstanding (in dollars per share)	$ 32.05	$ 40.93
Minimum [Member] \| Market-based Restricted Stock Units (RSUs) [Member]
Weighted-Average Grant Date Fair Value [Roll Forward]
Target percentage of equity awards earned	0.00%
Minimum [Member] \| Performance-based Restricted Stock Units (RSUs) [Member]
Weighted-Average Grant Date Fair Value [Roll Forward]
Target percentage of equity awards earned	0.00%
Maximum [Member] \| Market-based Restricted Stock Units (RSUs) [Member]
Weighted-Average Grant Date Fair Value [Roll Forward]
Target percentage of equity awards earned	200.00%
Maximum [Member] \| Performance-based Restricted Stock Units (RSUs) [Member]
Weighted-Average Grant Date Fair Value [Roll Forward]
Target percentage of equity awards earned	200.00%
Market Vesting Conditions [Member] \| Market-based Restricted Stock Units (RSUs) [Member]
Weighted-Average Grant Date Fair Value [Roll Forward]
Weighted-Average Grant Date Fair Value, Granted (in dollars per share)	$ 40.42

Share-based Compensation Arrangement by Share-based Payment Award Target Percentage of Equity Awards Earned

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- Definition

The weighted average fair value at grant date for changes in equity-based awards based on level of achievement of certain performance criteria during the period on other than stock (or unit) options plans for performance-based awards.

+ References

No definition available.

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- Definition

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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

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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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(3)

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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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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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.

+ 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 (c)(2)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(i)-(ii)

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- Definition

The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

+ 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 (c)(2)(iii)

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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

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

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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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(2)(iii)(2)

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