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Schedule of Unrecognized Compensation Cost and Weighted Average Period of Recognition (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended
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Jul. 31, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Unrecognized Compensation Cost | $ 30,926
Weighted Average Years | 2 years 7 months 6 days
Stock Options |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Unrecognized Compensation Cost | 1,707
Weighted Average Years | 1 year
Stock Appreciation Rights(SARs) |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Unrecognized Compensation Cost | 7,588
Weighted Average Years | 2 years 9 months 18 days
Performance Stock Units |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Unrecognized Compensation Cost | 21,371
Weighted Average Years | 2 years 8 months 12 days
Restricted Stock Units |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Unrecognized Compensation Cost | $ 260
Weighted Average Years | 1 year 2 months 12 days

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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 + Details
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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 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 + Details
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