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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

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- Definition

The amount of profit (loss) attributable to ordinary equity holders of the parent entity (the numerator) divided by the weighted average number of ordinary shares outstanding during the period (the denominator).

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- Definition

The profit (loss) attributable to owners of the parent. [Refer: Profit (loss)]

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The number of ordinary shares outstanding at the beginning of the period, adjusted by the number of ordinary shares bought back or issued during the period multiplied by a time-weighting factor.

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