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Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Numerator:
Profit	$ 86,436	$ 37,763	$ 59,880
Denominator:
Basic weighted average ordinary shares outstanding	50,388,440	50,582,852	51,372,117
Dilutive impact of equivalent stock options and RSUs	2,527,160	2,357,456	2,267,553
Diluted weighted average ordinary shares outstanding	52,915,600	52,940,308	53,639,670

X

- Definition

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The total of income less expenses, excluding the components of other comprehensive income. [Refer: Other comprehensive income]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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