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Share Based Payment - Summary of Terms and Conditions Relating to Grants under Share Incentive Plan (Detail) - shares
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Restricted Stock Units [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of instruments 1,478,191 1,334,759 1,325,531
Vesting conditions Refer notes Refer notes Refer notes
Contractual life 4 years 2 months 12 days 4 years 7 months 6 days 4 years 10 months 24 days
Employee Stock Options [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Number of instruments   21,588  
Vesting conditions   Refer notes  
Bottom of Range [Member] | Restricted Stock Units [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Contractual life 4 years 4 years 4 years
Bottom of Range [Member] | Employee Stock Options [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Contractual life   4 years  
Top of Range [Member] | Restricted Stock Units [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Contractual life 8 years 8 years 8 years
Top of Range [Member] | Employee Stock Options [Member]      
Disclosure of terms and conditions of share-based payment arrangement [Line Items]      
Contractual life   7 years