Number Common Shares Per Performance Share Unit

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- Definition

Share Based Compensation Annualized Forfeiture Rate

+ References

No definition available.

+ Details

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- 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

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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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

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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

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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

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 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.

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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

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph a

-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 (a)(3)

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

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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 - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2013 Y	Jan. 31, 2012	Jan. 31, 2011
Share Based Compensation [Line Items]
Assumed annualized forfeiture rate	5.00%	5.00%	5.00%
Recognized tax benefits related to stock options	$ 3,921	$ 1,058	$ 3,700
Stock options vesting period, minimum (in years)	3
Stock options vesting period, maximum (in years)	5
Minimum
Share Based Compensation [Line Items]
Vesting period (in years)	7 years
Maximum
Share Based Compensation [Line Items]
Vesting period (in years)	10 years
Two Thousand Eight Stock Incentive Plan
Share Based Compensation [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	6,259,024
Two Thousand Four Incentive Plan
Share Based Compensation [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	809,182
Stock Options
Share Based Compensation [Line Items]
Recognized tax benefits related to stock options	6,532	953	1,336
Compensation cost of stock options granted but not yet vested	2,391
Weighted average period of recognition (in years)	1 year 1 month 6 days
Stock Appreciation Rights (SARs)
Share Based Compensation [Line Items]
Vesting period (in years)	5 years
Compensation cost of stock options granted but not yet vested	9,163
Weighted average period of recognition (in years)	3 years 2 months 12 days
Weighted average grant date fair value	$ 11.85	$ 9.50	$ 12.57
Performance Share Units
Share Based Compensation [Line Items]
Vesting period (in years)	5 years
Compensation cost of stock options granted but not yet vested	24,376
Weighted average period of recognition (in years)	3 years
Weighted average grant date fair value	$ 18.22	$ 16.21	$ 24.03
Common shares per PSU	1
Aggregate grant date fair value, vested			1,060
Restricted Stock Units (RSUs)
Share Based Compensation [Line Items]
Weighted average grant date fair value		$ 20.08	$ 36.64
Aggregate grant date fair value, vested		$ 12
Restricted Stock Units (RSUs) \| Minimum
Share Based Compensation [Line Items]
Vesting period (in years)	3 years
Restricted Stock Units (RSUs) \| Maximum
Share Based Compensation [Line Items]
Vesting period (in years)	5 years
Share based awards granted in previous years \| Forfeiture rate 1
Share Based Compensation [Line Items]
Assumed annualized forfeiture rate	5.00%
Share based awards granted in previous years \| Forfeiture rate 2
Share Based Compensation [Line Items]
Assumed annualized forfeiture rate	2.00%