v3.26.1
Share-based payments (Details 2) - Category A [Member] - DRL 2007 Plan [Member]
 12 Months Ended
Mar. 31, 2026
shares
Number
mo
₨ / shares
Mar. 31, 2026
shares
Number
mo
₨ / shares
$ / shares
Mar. 31, 2025
shares
Number
mo
₨ / shares
Mar. 31, 2025
shares
Number
mo
₨ / shares
$ / shares
Mar. 31, 2026
Number
mo
$ / shares
Mar. 31, 2025
Number
mo
$ / shares
Statements [Line Items]            
Shares arising out of options, Outstanding at the beginning of the year | shares 1,015,295 1,015,295 1,080,420 1,080,420    
Shares arising out of options, Granted during the year | Number 353,057 353,057 272,310 272,310    
Shares arising out of options, Expired/forfeited during the year (7,055) (7,055) (232,970) (232,970)    
Shares arising out of options, Exercised during the year | shares (46,405) (46,405) (104,465) (104,465)    
Shares arising out of options, Outstanding at the end of the year | shares 1,314,892 1,314,892 1,015,295 1,015,295    
Shares arising out of options, Exercisable at the end of the year | Number 388,360 388,360 57,945 57,945 388,360 57,945
Weighted average exercise price, Outstanding at the beginning of the year | (per share) ₨ 971.5 $ 971.5 ₨ 845.25      
Weighted average exercise price, Granted during the year | ₨ / shares 1,162   1,270      
Weighted average exercise price, expired/forfeited during the year | ₨ / shares 985.42   828.05      
Weighted average exercise price, Exercised during the year | ₨ / shares 694.26   763.78      
Weighted average exercise price, Outstanding at the end of the year | (per share) 1,032.36   971.5 $ 971.5    
Weighted average exercise price, Exercisable at the end of the year | ₨ / shares ₨ 789.96 $ 789.96 ₨ 728.47 $ 728.47    
Weighted average remaining useful life, Outstanding at the beginning of the year | mo 70 70 72 72    
Weighted average remaining useful life, Granted during the year | mo 96 96 96 96    
Weighted average remaining useful life, Outstanding at the end of the year | mo 66 66 70 70    
Weighted average remaining useful life, Exercisable at the end of the year | mo 48 48 33 33 48 33
Bottom of range [member]            
Statements [Line Items]            
Range of exercise prices, Outstanding at the beginning of the year   $ 521.4   $ 521.4    
Range of exercise prices,exercised/forfeited during the year   981.4   562.8    
Range of exercise prices, Exercised during the year   521.4   521.4    
Range of exercise prices, Outstanding at the end of the year   562.8   521.4    
Range of exercise prices, Exercisable at the end of the year         $ 562.8 $ 521.4
Top of range [member]            
Statements [Line Items]            
Range of exercise prices, Outstanding at the beginning of the year   1,270   1,171.2    
Range of exercise prices,exercised/forfeited during the year   1,060.2   1,270    
Range of exercise prices, Exercised during the year   1,060.2   1,060.2    
Range of exercise prices, Outstanding at the end of the year   1,270   1,270    
Range of exercise prices, Exercisable at the end of the year         $ 1,171.2 $ 1,171.2
Middle Range One [Member]            
Statements [Line Items]            
Range of exercise prices, Granted during the year   $ 1,162   $ 1,270