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Other Investments - Schedule of Investment (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Disclosure Of Financial Assets [Line Items] |  |
Total other investments | $ 5,508 | $ 3,683
Financial assets measured at FVOCI [Member] |  |
Disclosure Of Financial Assets [Line Items] |  |
Equity securities (unlisted) | 5,409 | 3,584
Financial Assets Measured at Amortised Cost [Member] |  |
Disclosure Of Financial Assets [Line Items] |  |
Other securities | $ 99 | $ 99

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