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