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Employee Benefits - Summary of Sensitivity Analysis for Actuarial Assumptions (Parenthetical) (Detail)
Mar. 31, 2022
Mar. 31, 2021
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%