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Employee Benefits - Summary of Sensitivity Analysis for Actuarial Assumptions (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Mar. 31, 2020
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Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Abstract] |  |
Discount rate (1% movement) | $ (257) | $ (251)
Future salary growth (1% movement) | 275 | 276
Withdrawal rates (10% movement) | (632) | (636)
Discount rate (1% movement) | 280 | 274
Future salary growth (1% movement) | (260) | (260)
Withdrawal rates (10% movement) | $ 1,185 | $ 1,240

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