Earnings per equity share - Weighted Average Number of Equity Shares Used in Computing Earnings Per Equity Share (Detail) - shares |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Schedule of Weighted Average Number of Diluted Shares Outstanding [Line Items] | |||
| Weighted average number of equity shares used in computing basic earnings per equity share | 15,357,462,189 | 15,255,283,286 | 14,158,592,110 |
| Effect of potential equity shares for stock options outstanding | 48,909,382 | 63,584,926 | 56,312,746 |
| Weighted average number of equity shares used in computing diluted earnings per equity share | 15,406,371,571 | 15,318,868,212 | 14,214,904,856 |