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Employee Benefits - Summary of Sensitivity Analysis for Actuarial Assumptions (Parenthetical) (Detail) | Mar. 31, 2021 | Mar. 31, 2020
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Disclosure Of Sensitivity Analysis For Actuarial Assumptions [Abstract] |  |
Percentage of change in discount rate | 1.00% | 1.00%
Percentage of change in future salary growth | 1.00% | 1.00%
Percentage of change in withdrawal rate | 10.00% | 10.00%

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