Share-Based Compensation (Restricted Stock Units Activity) (Details) - $ / shares	3 Months Ended
Apr. 30, 2016	May. 02, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target percentage of equity awards earned	100.00%
Service-based restricted stock units
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at January 30, 2016	1,671,597
Number of Underlying Shares, Granted	725,483
Number of Underlying Shares, Adjustments for performance achievement	0
Number of Underlying Shares, Vested	(368,345)
Number of Underlying Shares, Forfeited	(27,434)
Number of Underlying Shares, Ending Balance at April 30, 2016	2,001,301
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance at January 30, 2016	$ (28.13)
Weighted-Average Grant Date Fair Value, Granted	29.56
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement	0.00
Weighted-Average Grant Date Fair Value, Vested	35.00
Weighted-Average Grant Date Fair Value, Forfeited	30.60
Weighted-Average Grant Date Fair Value, Ending Balance at April 30, 2016	$ (27.37)
Performance-based restricted stock units [Member]
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at January 30, 2016	185,500
Number of Underlying Shares, Granted	94,217
Number of Underlying Shares, Adjustments for performance achievement	0
Number of Underlying Shares, Vested	(31,875)
Number of Underlying Shares, Forfeited	(3,458)
Number of Underlying Shares, Ending Balance at April 30, 2016	244,384
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance at January 30, 2016	$ (23.42)
Weighted-Average Grant Date Fair Value, Granted	29.31
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement	0.00
Weighted-Average Grant Date Fair Value, Vested	36.11
Weighted-Average Grant Date Fair Value, Forfeited	25.34
Weighted-Average Grant Date Fair Value, Ending Balance at April 30, 2016	$ (24.01)
Market-based restricted stock units [Member]
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at January 30, 2016	117,711
Number of Underlying Shares, Granted	94,224
Number of Underlying Shares, Adjustments for performance achievement	0
Number of Underlying Shares, Vested	0
Number of Underlying Shares, Forfeited	(2,334)
Number of Underlying Shares, Ending Balance at April 30, 2016	209,601
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance at January 30, 2016	$ (25.00)
Weighted-Average Grant Date Fair Value, Granted	38.22	$ 19.04
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement	0.00
Weighted-Average Grant Date Fair Value, Vested	0.00
Weighted-Average Grant Date Fair Value, Forfeited	19.04
Weighted-Average Grant Date Fair Value, Ending Balance at April 30, 2016	$ (31.01)
Minimum \| Performance-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target percentage of equity awards earned	0.00%
Minimum \| Market-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target percentage of equity awards earned	0.00%
Maximum \| Performance-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target percentage of equity awards earned	200.00%
Maximum \| Market-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Target percentage of equity awards earned	200.00%

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

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

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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)
-URI http://asc.fasb.org/extlink&oid=6415400&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

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 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

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

+ References

No definition available.

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

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+ References

No definition available.

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

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

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

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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.

+ References

No definition available.

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- Definition

Weighted average price at which grantees could acquire or could have acquired the underlying shares with respect to any other type of change in shares reserved for issuance.

+ References

No definition available.

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