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Related Party - Key Management Personnel Compensation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Disclosure of transactions between related parties [abstract]      
Remuneration and short-term benefits $ 6,614 $ 4,592 $ 4,671
Defined contribution plan 94 89 84
Other benefits 17 15 14
Share-based compensation expense $ 17,677 $ 13,347 $ 8,674