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Share-Based Compensation - Additional Information (Detail)	9 Months Ended
	Oct. 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	405,659

X

- Definition

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

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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.

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