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Income Taxes - Income Taxes Recognized Directly in Equity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2016
Current and deferred tax relating to items charged or credited directly to equity [abstract]      
Excess tax deductions related to share-based payments $ (685) $ (270) $ (229)
Excess tax deductions related to share-based payments (1,135) 715 (688)
Total income tax recognized directly in equity $ (1,820) $ 445 $ (917)