Earnings per equity share - Weighted Average Number of Equity Shares Used in Computing Earnings Per Equity Share (Detail) - shares |
12 Months Ended | ||
|---|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
Mar. 31, 2023 |
|
| 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 | 7,627,641,643 | 7,079,296,055 | 5,565,620,562 |
| Effect of potential equity shares for stock options outstanding | 31,792,463 | 28,156,373 | 21,552,766 |
| Weighted average number of equity shares used in computing diluted earnings per equity share | 7,659,434,106 | 7,107,452,428 | 5,587,173,328 |