v3.25.2
Employees' Stock Option Plans (ESOP) - Summary of Fair Value estimated on Date of Grant (Details) - Black-Scholes-Merton Model - Restricted Stock Units (RSU) Grant Date
12 Months Ended
Mar. 31, 2025
INR (₨)
yr
₨ / shares
Mar. 31, 2025
INR (₨)
yr
$ / shares
Mar. 31, 2024
INR (₨)
yr
₨ / shares
Mar. 31, 2024
INR (₨)
yr
$ / shares
Mar. 31, 2023
INR (₨)
yr
₨ / shares
Mar. 31, 2023
INR (₨)
yr
$ / shares
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Indian Equity Shares                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Weighted average share price | ₨ / shares ₨ 1,808   ₨ 1,588   ₨ 1,525        
Exercise price | ₨ / shares ₨ 5.00   ₨ 5.00   ₨ 5.00        
Risk-free interest rate 7.00% 7.00%              
Weighted average fair value as on grant date | ₨ ₨ 1,555 ₨ 1,555 ₨ 1,317 ₨ 1,317 ₨ 1,210 ₨ 1,210      
Indian Equity Shares | Bottom of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 21.00% 21.00% 23.00% 23.00% 23.00% 23.00%      
Expected life of the option (years) 1 1 1 1 1 1      
Expected dividends 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%      
Risk-free interest rate     7.00% 7.00% 5.00% 5.00%      
Indian Equity Shares | Top of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 26.00% 26.00% 31.00% 31.00% 32.00% 32.00%      
Expected life of the option (years) 4 4 4 4 4 4      
Expected dividends 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%      
Risk-free interest rate         7.00% 7.00%      
ADS                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Weighted average share price | $ / shares   ₨ 21.44   ₨ 19.19   ₨ 18.08      
Exercise price | $ / shares   ₨ 0.07   ₨ 0.07   ₨ 0.07      
Weighted average fair value as on grant date | $             $ 18.2 $ 16.27 $ 13.69
ADS | Bottom of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 23.00% 23.00% 25.00% 25.00% 27.00% 27.00%      
Expected life of the option (years) 1 1 1 1 1 1      
Expected dividends 2.00% 2.00% 2.00% 2.00% 2.00% 2.00%      
Risk-free interest rate 4.00% 4.00% 4.00% 4.00% 2.00% 2.00%      
ADS | Top of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 28.00% 28.00% 33.00% 33.00% 34.00% 34.00%      
Expected life of the option (years) 4 4 4 4 4 4      
Expected dividends 3.00% 3.00% 3.00% 3.00% 3.00% 3.00%      
Risk-free interest rate 5.00% 5.00% 5.00% 5.00% 5.00% 5.00%