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Schedule of Share Based Awards Issued and Weighted Average Fair Value (Detail) (USD $) | 6 Months Ended
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Jul. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Issued | 230,500
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 | 93,000
Weighted Average Fair Value | $ 24.56
Restricted Stock Units |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Awards Issued | 10,000
Weighted Average Fair Value | $ 39.06

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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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Data Type: | num:perShareItemType
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Period Type: | duration

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- Details
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- 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 + Details
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