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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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ 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 (i)

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

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (h)(1)(i)

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

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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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(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

+ Details

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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 (d)(2)

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

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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 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

+ 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 - Additional Information (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed annualized forfeiture rate	5.00%	5.00%	5.00%
Recognized tax benefits related to stock options	$ 5,976	$ 3,921	$ 1,058
Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	7 years
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	10 years
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	5 years
Compensation cost of stock options granted but not yet vested	44,074
Weighted average period of recognition (in years)	3 years 4 months 24 days
Common shares per PSU	1
Weighted average grant date fair value	$ 25.13	$ 18.22	$ 16.21
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost of stock options granted but not yet vested	127
Weighted average period of recognition (in years)	1 year
Weighted average grant date fair value	$ 39.06	$ 0.00	$ 20.08
Aggregate grant date fair value, vested	0	0	12
Restricted Stock Units (RSUs) \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	3 years
Restricted Stock Units (RSUs) \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	5 years
Two Thousand Eight Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	5,760,409
Two Thousand Four Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares authorized	10,000,000
Common shares available to grant	32,682
Share based awards granted in previous years \| Forfeiture rate 1
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed annualized forfeiture rate	5.00%
Share based awards granted in previous years \| Forfeiture rate 2
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Assumed annualized forfeiture rate	5.00%
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Recognized tax benefits related to stock options	10,312	6,532	953
Compensation cost of stock options granted but not yet vested	767
Weighted average period of recognition (in years)	7 months 6 days
Stock Options \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	3 years
Stock Options \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	5 years
Stock Appreciation Rights(SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options vesting period, maximum (in years)	5 years
Recognized tax benefits related to stock options	305	0	0
Compensation cost of stock options granted but not yet vested	$ 5,873
Weighted average period of recognition (in years)	2 years 4 months 24 days