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Stock Options Outstanding, Employees Stock Option Schemes (Detail) - Employees Stock Option Scheme
12 Months Ended
Mar. 31, 2021
₨ / shares
shares
Mar. 31, 2021
$ / shares
₨ / shares
shares
Mar. 31, 2020
₨ / shares
shares
Mar. 31, 2019
₨ / shares
shares
Mar. 31, 2018
₨ / shares
shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Number Of Shares Arising Out Of Options | shares 168,168,760 168,168,760 142,865,602 136,612,822 150,887,600
Weighted Average Exercise Price | ₨ / shares ₨ 1,063.79 ₨ 1,063.79 ₨ 899.03 ₨ 682.99 ₨ 525.11
Plan ''C''          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Range of exercise price | (per share) ₨ 417.75 ₨ 5.71      
Number Of Shares Arising Out Of Options | shares 9,700 9,700      
Weighted Average Remaining Life 3 months 25 days 3 months 25 days      
Weighted Average Exercise Price | ₨ / shares ₨ 417.75 ₨ 417.75      
Plan "F"          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 417.75 ₨ 5.71      
Range of exercise price, Upper Range | (per share) ₨ 731.08 ₨ 10.00      
Number Of Shares Arising Out Of Options | shares 34,974,270 34,974,270      
Weighted Average Remaining Life 1 year 5 months 23 days 1 year 5 months 23 days      
Weighted Average Exercise Price | ₨ / shares ₨ 610.67 ₨ 610.67      
Plan "G"          
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 882.85 ₨ 12.07      
Range of exercise price, Upper Range | (per share) ₨ 1,235.80 ₨ 16.90      
Number Of Shares Arising Out Of Options | shares 133,184,790 133,184,790      
Weighted Average Remaining Life 3 years 2 months 4 days 3 years 2 months 4 days      
Weighted Average Exercise Price | ₨ / shares ₨ 1,182.83 ₨ 1,182.83