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Income Taxes - Income Taxes Recognized Directly in Equity (Detail) - USD ($)
$ in Thousands
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Current and deferred tax relating to items charged or credited directly to equity [abstract]      
Excess tax deductions related to share-based payments $ (1,260) $ (685) $ (270)
Excess tax deductions related to share-based payments 46 (1,135) 715
Total income tax recognized directly in equity $ (1,214) $ (1,820) $ 445