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Schedule of Share Based Awards Issued and Weighted Average Fair Value (Detail) (USD $)	9 Months Ended
	Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Issued	1,597,500
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Issued	100,000
Weighted Average Fair Value	$ 9.67
Stock Appreciation Rights(SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Issued	27,500
Weighted Average Fair Value	$ 14.11
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Issued	1,460,000
Weighted Average Fair Value	$ 25.14
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Issued	10,000
Weighted Average Fair Value	$ 39.06

X

- 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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Namespace Prefix:	us-gaap_
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X

- Definition

Number of share instruments newly issued under a share-based compensation 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

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

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Balance Type:	na
Period Type:	duration