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Schedule of Share Based Awards Issued and Weighted Average Fair Value (Detail) - 6 months ended Jul. 31, 2015 - $ / shares	Total
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Granted	300,500
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Granted	120,000
Weighted Average Fair Value	$ 7.46
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards Granted	180,500
Weighted Average Fair Value	$ 24.07

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

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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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

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