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Personnel Expenses - Summary of Personnel expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Disclosure Of Personnel Expenses [Abstract]                      
Wages, salaries and other employees benefits                 $ 64,387 $ 78,988 $ 66,358
Contributions to defined contribution plans                 2,994 3,890 3,068
Expenses related to defined benefit plans (refer note 33)                 1,194 1,598 1,122
Equity-settled share based payment (refer note 34)                 35,589 41,487 39,745
Employee welfare expenses                 1,497 3,873 3,274
Total $ 28,746 $ 26,579 $ 25,356 $ 24,980 $ 34,456 $ 31,659 $ 32,564 $ 31,157 $ 105,661 $ 129,836 $ 113,567