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Employee Benefits - Additional Information (Detail)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Bottom of Range [Member]    
Disclosure Of Defined Benefit Plans [Line Items]    
Weighted average duration of defined benefit obligation 4 years 4 years
Top of Range [Member]    
Disclosure Of Defined Benefit Plans [Line Items]    
Weighted average duration of defined benefit obligation 6 years 7 years