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Earnings Per Equity Share - Additional Information (Detail) - ₨ / shares
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 08, 2019
Jun. 15, 2017
Earnings per share [abstract]          
Bonus issue ratio 0.00% 33.33% 100.00%    
Par value per share ₨ 2 ₨ 2 ₨ 2 ₨ 2 ₨ 2