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Earnings Per Equity Share - Summary of Diluted Earnings Per Share (Detail)
₨ / shares in Units, $ / shares in Units, ₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
₨ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
shares
Mar. 31, 2019
INR (₨)
₨ / shares
shares
Mar. 31, 2018
INR (₨)
₨ / shares
shares
Earnings per share [abstract]        
Profit attributable to equity holders of the Company ₨ 97,218 $ 1,288 ₨ 90,031 ₨ 80,081
Weighted average number of equity shares outstanding 5,833,384,018 5,833,384,018 6,007,376,837 6,333,391,200
Effect of dilutive equivalent share options 14,439,221 14,439,221 14,927,530 11,091,433
Weighted average number of equity shares for diluted earnings per share 5,847,823,239 5,847,823,239 6,022,304,367 6,344,482,633
Diluted earnings per share | (per share) ₨ 16.62 $ 0.22 ₨ 14.95 ₨ 12.62