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Income Taxes - Domestic and Foreign Source Component of Profit/(Loss) Before Income Taxes (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Disclosure of income taxes [Line Items] |  |  |
Profit before income taxes | $ 131,152 | $ 101,867 | $ 55,293
Domestic [member] |  |  |
Disclosure of income taxes [Line Items] |  |  |
Profit before income taxes | (2,742) | (4,439) | (5,342)
Foreign [member] |  |  |
Disclosure of income taxes [Line Items] |  |  |
Profit before income taxes | $ 133,894 | $ 106,306 | $ 60,635

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