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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, 2022 ₨ / shares | Mar. 31, 2022 $ / shares | Mar. 31, 2021 ₨ / shares | Mar. 31, 2020 ₨ / shares
Earnings Per Share Disclosure [Line Items] |  |  |  |
Basic earnings per share | (per share) | ₨ 69.76 | $ 0.92 | ₨ 59.27 | ₨ 47.59
Effect of potential equity shares for stock options outstanding | (per share) | 0.38 | 0.01 | 0.25 | 0.32
Diluted earnings per share | (per share) | 69.38 | 0.91 | 59.02 | 47.27
Basic earnings per share | (per share) | 209.28 | 2.76 | 177.81 | 142.77
Diluted earnings per share | (per share) | 208.14 | 2.73 | 177.06 | 141.81
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 | ₨ 0.75 | ₨ 0.96

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