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Earnings Per Equity Share - Summary of Basic Earnings Per Share (Detail)
₨ / shares in Units, $ / shares in Units, ₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
₨ / shares
shares
Mar. 31, 2018
USD ($)
$ / shares
shares
Mar. 31, 2017
INR (₨)
₨ / shares
shares
Mar. 31, 2016
INR (₨)
₨ / shares
shares
Earnings per share [abstract]        
Profit attributable to equity holders of the Company ₨ 80,081 $ 1,230 ₨ 84,895 ₨ 89,075
Weighted average number of equity shares outstanding 4,750,043,400 4,750,043,400 4,857,081,010 4,913,118,800
Basic earnings per share | (per share) ₨ 16.86 $ 0.26 ₨ 17.48 ₨ 18.13