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Share-Based Compensation - Additional Information (Detail)	6 Months Ended
	Jul. 31, 2015 shares
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock exercised	1,416,990
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock exercised	520,358
Performance Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
stock units vested	251,081
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
stock units vested	5,000

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting 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 (c)(2)(iii)(2)



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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 options (or share units) exercised during the current period.

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-Publisher FASB



-Name Accounting Standards Codification



-Topic 505



-SubTopic 10



-Section 50



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-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644



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-Publisher FASB



-Name Accounting Standards Codification



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-Section S99



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-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Publisher SEC



-Name Regulation S-X (SX)



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-Section 02



-Paragraph 29, 30



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