Number Common Shares Per Performance Share Unit

No definition available.

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- Definition

Share based compensation annualized forfeiture rate.

+ References

No definition available.

+ Details

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted In Period, Total Fair Value

+ References

No definition available.

+ Details

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- Definition

Share based compensation, stock options vesting period maximum

+ References

No definition available.

+ Details

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- Definition

Share based compensation, stock options vesting period minimum

+ References

No definition available.

+ Details

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- Definition

As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

+ Details

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- Definition

The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

+ References

+ Details

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

+ References

+ Details

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- Definition

Description of the period of time over 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, which may be expressed in a variety of ways (for example, in years, month and year).

+ References

+ Details

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- Definition

The maximum vesting term over 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.

+ References

No definition available.

+ Details

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- Definition

The minimum vesting term over 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.

+ References

No definition available.

+ Details

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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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(2)(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 Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph c(1)

-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 3: 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

+ Details

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- Definition

The total fair value of equity-based awards 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

+ Details

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- Definition

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ References

+ Details

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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

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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

+ Details

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Share-Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
Share-Based Compensation (Narrative) (Details) (USD $)	Jan. 31, 2012 years	Jan. 31, 2011	Jan. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed annualized forfeiture rate	5.00%	5.00%	2.00%
Recognized tax benefits related to stock options	$ 953,000	$ 1,336,000	$ 1,034,000
Stock options vesting period, minimum (in years)	3
Stock options vesting period, maximum (in years)	5
Vesting period (in years), minimum	seven
2008 Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	6,951,650
2004 Stock Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	902,516
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost of stock options granted but not yet vested	6,044,000
Weighted average period of recognition (in years)	2.09
Stock Appreciation Rights [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost of stock options granted but not yet vested	5,589,000
Weighted average period of recognition (in years)	3.7
Vesting period (in years)	five
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost of stock options granted but not yet vested	35,978,000
Weighted average period of recognition (in years)	4.3
Common shares per PSU	1
Vesting period (in years)	five
Aggregate grant date fair value, granted	35,629,000	9,621,000	26,932,000
Aggregate grant date fair value, vested		1,060,000
Fair value of restricted share	$ 16.21
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost of stock options granted but not yet vested	195,000
Weighted average period of recognition (in years)	4.2
Vesting period (in years), minimum	three
Vesting period (in years), maximum	five
Aggregate grant date fair value, granted	201,000	37,000
Aggregate grant date fair value, vested	$ 12,000
Fair value of restricted share	$ 20.08
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years), maximum	ten
Non-Employee Directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	one