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Share-Based Compensation - Additional Information (Detail)	6 Months Ended
	Jul. 31, 2019 shares
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock exercised	40,000
Performance Stock Units (PSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock units vested	139,999
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock units vested	388,990

X

- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=116856206&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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Number of share options (or share units) exercised during the current period.

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-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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-Topic 505
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-Name Accounting Standards Codification
-Topic 210
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