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Earnings per equity share - Reconciliations of Basic and Diluted Earnings Per Equity Share and Earnings per American Depositary Shares (Detail) | 12 Months Ended
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Mar. 31, 2025 ₨ / shares | Mar. 31, 2025 $ / shares | Mar. 31, 2024 ₨ / shares | Mar. 31, 2023 ₨ / shares
Earnings Per Share Disclosure [Line Items] |  |  |  |
Basic earnings per share | (per share) | ₨ 90.01 | $ 1.05 | ₨ 88.66 | ₨ 89.02
Effect of potential equity shares for stock options outstanding | (per share) | 0.38 | 0.01 | 0.35 | 0.34
Diluted earnings per share | (per share) | 89.63 | 1.04 | 88.31 | 88.68
Basic earnings per share | (per share) | 270.03 | 3.15 | 265.98 | 267.06
Diluted earnings per share | (per share) | 268.89 | 3.12 | 264.93 | 266.04
American Depository Shares | Stock Compensation Plan |  |  |  |
Earnings Per Share Disclosure [Line Items] |  |  |  |
Effect of potential equity shares for stock options outstanding | (per share) | ₨ 1.14 | $ 0.03 | ₨ 1.05 | ₨ 1.02

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