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Financial Instruments - Summary of Sensitivity Analysis For Other Investments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Abstract] |  |
Annual revenue growth rate, increase in other comprehensive income | $ 424 | $ 314
EBITDA Margin, increase in other comprehensive income | 265 | 145
Risk adjusted discount rate, decrease in other comprehensive income | (419) | (280)
Annual revenue growth rate, decrease in other comprehensive income | (414) | (312)
EBITDA Margin, decrease in other comprehensive income | (265) | (145)
Risk adjusted discount rate, increase in other comprehensive income | $ 492 | $ 330

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