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Share-based Payments - Movements in Number of Restricted Share Units Dependent on Market Performance Condition Outstanding under 2006 and 2016 Incentive Award Plan and Related Weighted Average Fair Values (Detail) - RSUs dependent on market performance condition [member]	12 Months Ended
	Mar. 31, 2018 USD ($) yr	Mar. 31, 2017 USD ($) yr	Mar. 31, 2016 USD ($) yr
Disclosure of terms and conditions of share-based payment arrangement [Line Items]
Beginning balance	203,990	129,590
Granted		74,400
Exercised	0	0
Forfeited	0	0
Lapsed	0	0
Ending balance	203,990	203,990	129,590
Weighted average fair value, Beginning balance	$ 13.21	$ 4.44
Exercisable	0
Weighted average fair value, Granted		12.56
Weighted average fair value, Ending balance	$ 13.21	$ 13.21	$ 4.44
Weighted average remaining contract term (in years) | yr	7.10	8.10	8.53
Weighted average remaining contract term (in years), exercisable | yr	0
Aggregate intrinsic value	$ 9,247,000	$ 5,836,000	$ 3,971,000
Aggregate intrinsic value, exercisable	$ 0

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The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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