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Share-Based Compensation - Additional Information (Detail)	9 Months Ended
	Oct. 31, 2018 shares
Performance Stock Units (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units vested	465,192
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock exercised	430,000
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock exercised	197,600
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock units vested	212,500

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- Definition

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

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

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