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Related Party - Key Management Personnel Compensation (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of transactions between related parties [abstract]      
Remuneration and short-term benefits $ 6,464 $ 6,614 $ 4,592
Defined contribution plan 97 94 89
Other benefits 16 17 15
Share-based compensation expense $ 14,957 $ 17,677 $ 13,347