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Stock Options Outstanding, Employees Stock Option Schemes (Detail) - Employees Stock Option Scheme
12 Months Ended
Mar. 31, 2017
₨ / shares
shares
Mar. 31, 2017
₨ / shares
$ / shares
shares
Mar. 31, 2016
₨ / shares
shares
Mar. 31, 2015
₨ / shares
shares
Mar. 31, 2014
₨ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Number Of Shares Arising Out Of Options | shares 92,156,300 92,156,300 128,654,300 109,033,000 92,476,600
Weighted Average Exercise Price | ₨ / shares ₨ 904.97 ₨ 904.97 ₨ 840.19 ₨ 683.16 ₨ 556.06
Plan ''C''          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 680.00 ₨ 10.49      
Range of exercise price, Upper Range | (per share) ₨ 835.50 ₨ 12.88      
Number Of Shares Arising Out Of Options | shares 4,644,400 4,644,400      
Weighted Average Remaining Life 2 years 4 months 2 days 2 years 4 months 2 days      
Weighted Average Exercise Price | ₨ / shares ₨ 690.91 ₨ 690.91      
Plan ''D''          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Range of exercise price | (per share) ₨ 680.00 ₨ 10.49      
Number Of Shares Arising Out Of Options | shares 3,334,300 3,334,300      
Weighted Average Remaining Life 2 years 3 months 29 days 2 years 3 months 29 days      
Weighted Average Exercise Price | ₨ / shares ₨ 680.00 ₨ 680.00      
Plan "E"          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 468.40 ₨ 7.22      
Range of exercise price, Upper Range | (per share) ₨ 680.00 ₨ 10.49      
Number Of Shares Arising Out Of Options | shares 15,094,600 15,094,600      
Weighted Average Remaining Life 2 years 2 months 5 days 2 years 2 months 5 days      
Weighted Average Exercise Price | ₨ / shares ₨ 650.01 ₨ 650.01      
Plan "F"          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 835.50 ₨ 12.88      
Range of exercise price, Upper Range | (per share) ₨ 1,097.80 ₨ 16.93      
Number Of Shares Arising Out Of Options | shares 69,083,000 69,083,000      
Weighted Average Remaining Life 3 years 10 months 25 days 3 years 10 months 25 days      
Weighted Average Exercise Price | ₨ / shares ₨ 985.92 ₨ 985.92