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Employee Benefits - Summary of Sensitivity Analysis for Actuarial Assumptions (Parenthetical) (Detail)	Mar. 31, 2021	Mar. 31, 2020
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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Change in defined benefit obligation due to reasonably possible increase in actuarial assumption on Discount rate

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Change in defined benefit obligation due to reasonably possible increase in actuarial assumption on Future salary growth

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Change in defined benefit obligation due to reasonably possible increase in actuarial assumption on Withdrawal rate

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