Earnings Per Equity Share - Summary of Diluted Earnings Per Share (Detail) ₨ / shares in Units, ₨ in Millions, $ in Millions	12 Months Ended
Mar. 31, 2026 INR (₨) ₨ / shares shares	Mar. 31, 2026 USD ($) shares	Mar. 31, 2025 INR (₨) ₨ / shares shares	Mar. 31, 2024 INR (₨) ₨ / shares shares
Earnings per share [abstract]
Profit attributable to equity holders of the Company	₨ 131,974	$ 1,407	₨ 131,354	₨ 110,452
Weighted average number of equity shares outstanding	10,476,247,846	10,476,247,846	10,456,741,552	10,576,571,110
Effect of dilutive equivalent share options	27,175,090	27,175,090	32,197,840	34,853,518
Weighted average number of equity shares for diluted earnings per share	10,503,422,936	10,503,422,936	10,488,939,392	10,611,424,628
Diluted Earnings Per Share \| ₨ / shares	₨ 12.56		₨ 12.52	₨ 10.41

The weighted average number of ordinary shares outstanding plus the weighted average number of ordinary shares that would be issued on the conversion of all the dilutive potential ordinary shares into ordinary shares. [Refer: Ordinary shares [member]; Weighted average [member]]

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The potential dilutive effect on the weighted average number of ordinary shares that relate to the assumed exercise of the entity's share options.

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The profit (loss) from continuing and discontinued operations 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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Diluted earnings per share.

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