v3.25.2
Earnings per equity share - Reconciliations of Basic and Diluted Earnings Per Equity Share and Earnings per American Depositary Shares (Detail)
12 Months Ended
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