v3.26.1
Employees' Stock Option Plans (ESOP) - Summary of Fair Value estimated on Date of Grant (Details) - Black-Scholes-Merton Model
12 Months Ended
Mar. 31, 2026
INR (₨)
yr
₨ / shares
Mar. 31, 2026
INR (₨)
yr
$ / shares
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, 2026
USD ($)
Mar. 31, 2025
USD ($)
Mar. 31, 2024
USD ($)
Restricted Stock Units (RSU) Grant Date | Indian Equity Shares                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Weighted average share price | ₨ / shares ₨ 1,641   ₨ 1,808   ₨ 1,588        
Exercise price | ₨ / shares ₨ 5.00   ₨ 5.00   ₨ 5.00        
Risk-free interest rate 6.00% 6.00% 7.00% 7.00%          
Weighted average fair value as on grant date | ₨ ₨ 1,331 ₨ 1,331 ₨ 1,555 ₨ 1,555 ₨ 1,317 ₨ 1,317      
Restricted Stock Units (RSU) Grant Date | Indian Equity Shares | Bottom of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 23.00% 23.00% 21.00% 21.00% 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%      
Restricted Stock Units (RSU) Grant Date | Indian Equity Shares | Top of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 26.00% 26.00% 26.00% 26.00% 31.00% 31.00%      
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%      
Restricted Stock Units (RSU) Grant Date | ADS                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Weighted average share price | $ / shares   ₨ 17.55   ₨ 21.44   ₨ 19.19      
Exercise price | $ / shares   ₨ 0.10   ₨ 0.07   ₨ 0.07      
Risk-free interest rate 4.00% 4.00%              
Weighted average fair value as on grant date | $             $ 14.16 $ 18.2 $ 16.27
Restricted Stock Units (RSU) Grant Date | ADS | Bottom of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 25.00% 25.00% 23.00% 23.00% 25.00% 25.00%      
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%      
Restricted Stock Units (RSU) Grant Date | ADS | Top of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 29.00% 29.00% 28.00% 28.00% 33.00% 33.00%      
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%      
Employee Stock Options (ESOPs) | Indian Equity Shares                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Weighted average share price | ₨ / shares ₨ 1,554                
Exercise price | ₨ / shares ₨ 1,554                
Risk-free interest rate 6.00% 6.00%              
Weighted average fair value as on grant date | ₨ ₨ 390 ₨ 390              
Employee Stock Options (ESOPs) | Indian Equity Shares | Bottom of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 25.00% 25.00%              
Expected life of the option (years) 3 3              
Expected dividends 2.00% 2.00%              
Employee Stock Options (ESOPs) | Indian Equity Shares | Top of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 28.00% 28.00%              
Expected life of the option (years) 7 7              
Expected dividends 3.00% 3.00%              
Employee Stock Options (ESOPs) | ADS                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Weighted average share price | $ / shares   ₨ 17.93              
Exercise price | $ / shares   ₨ 17.93              
Risk-free interest rate 4.00% 4.00%              
Weighted average fair value as on grant date | $             $ 4.09    
Employee Stock Options (ESOPs) | ADS | Bottom of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 26.00% 26.00%              
Expected life of the option (years) 3 3              
Expected dividends 2.00% 2.00%              
Employee Stock Options (ESOPs) | ADS | Top of Range                  
Disclosure Of Terms And Conditions Of Sharebased Payment Arrangement [Line Items]                  
Expected volatility 30.00% 30.00%              
Expected life of the option (years) 7 7              
Expected dividends 3.00% 3.00%