Employee Benefit Plans (Summary Of The Status Of Stock-Based Equity Incentives Outstanding) (Details) (USD $)	12 Months Ended
Jan. 31, 2012 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	1,651,400
Weighted-average remaining contractual life (years)	4.2
Weighted-average exercise price, Outstanding	$ 33.89
Number exercisable	1,296,587
Weighted-average exercise price, Exercisable	$ 36.72
$21.13 - $21.13 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	339,766
Weighted-average remaining contractual life (years)	7.1
Weighted-average exercise price, Outstanding	$ 21.13
Number exercisable	23,648
Weighted-average exercise price, Exercisable	$ 21.13
Lower range of exercise price	$ 21.13
Upper range of exercise price	$ 21.13
$24.04 - $35.38 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	340,329
Weighted-average remaining contractual life (years)	3.9
Weighted-average exercise price, Outstanding	$ 31.80
Number exercisable	332,914
Weighted-average exercise price, Exercisable	$ 31.81
Lower range of exercise price	$ 24.04
Upper range of exercise price	$ 35.38
$35.95 - $36.66 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	84,000
Weighted-average remaining contractual life (years)	4.5
Weighted-average exercise price, Outstanding	$ 36.58
Number exercisable	84,000
Weighted-average exercise price, Exercisable	$ 36.58
Lower range of exercise price	$ 35.95
Upper range of exercise price	$ 36.66
$37.04- $37.04 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	295,130
Weighted-average remaining contractual life (years)	4.2
Weighted-average exercise price, Outstanding	$ 37.04
Number exercisable	295,130
Weighted-average exercise price, Exercisable	$ 37.04
Lower range of exercise price	$ 37.04
Upper range of exercise price	$ 37.04
$37.06 - $41.08 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	450,116
Weighted-average remaining contractual life (years)	2.7
Weighted-average exercise price, Outstanding	$ 39.24
Number exercisable	446,725
Weighted-average exercise price, Exercisable	$ 39.25
Lower range of exercise price	$ 37.06
Upper range of exercise price	$ 41.08
$41.55 - $48.79 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	138,559
Weighted-average remaining contractual life (years)	2.2
Weighted-average exercise price, Outstanding	$ 44.09
Number exercisable	110,670
Weighted-average exercise price, Exercisable	$ 43.38
Lower range of exercise price	$ 41.55
Upper range of exercise price	$ 48.79
$51.17 - $51.17 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding	3,500
Weighted-average remaining contractual life (years)	0.1
Weighted-average exercise price, Outstanding	$ 51.17
Number exercisable	3,500
Weighted-average exercise price, Exercisable	$ 51.17
Lower range of exercise price	$ 51.17
Upper range of exercise price	$ 51.17

Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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)(iii)

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

+ Details

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

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

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

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

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Balance Type:	na
Period Type:	instant

- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

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

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

+ 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)(i)-(ii)

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

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Period Type:	instant

- Definition

The weighted-average period remaining as of the balance sheet date until option expiration pertaining to the outstanding stock options for all option plans in the customized range of exercise prices, which may be expressed in a variety of ways (for example, years, months).

+ 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 (e)(1)

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

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Balance Type:	na
Period Type:	instant

- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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