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Financial Instruments - Summary of Other Liabilities Related to Business Combination (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Disclosure Of Financial Instruments [Abstract] |  |
Increase in profit or loss, Risk adjusted discount rate | $ 179 | $ 144
Decrease in Profit or loss, Risk adjusted discount rate | $ (185) | $ (149)

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- Definition Decrease in risk adjusted discount rate. + References No definition available. + Details
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