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Stock Options Outstanding, Employees Stock Option Schemes (Detail)
12 Months Ended
Mar. 31, 2016
₨ / shares
shares
Mar. 31, 2016
₨ / shares
$ / shares
shares
Mar. 31, 2015
₨ / shares
shares
Mar. 31, 2014
₨ / shares
shares
Mar. 31, 2013
₨ / shares
shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Weighted Average Exercise Price ₨ 952.4 ₨ 952.4 ₨ 773.7    
Employees Stock Option Scheme          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Number Of Shares Arising Out Of Options | shares 128,654,300 128,654,300 109,033,000 92,476,600 65,443,045
Weighted Average Exercise Price ₨ 840.19 ₨ 840.19 ₨ 683.16 ₨ 556.06 ₨ 417.32
Employees Stock Option Scheme | 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 ₨ 10.26      
Range of exercise price, Upper Range | (per share) ₨ 835.50 ₨ 12.61      
Number Of Shares Arising Out Of Options | shares 5,740,800 5,740,800      
Weighted Average Remaining Life 3 years 4 months 2 days 3 years 4 months 2 days      
Weighted Average Exercise Price ₨ 693.00 ₨ 693.00      
Employees Stock Option Scheme | Plan ''D''          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Range of exercise price | (per share) ₨ 680.00 ₨ 10.26      
Number Of Shares Arising Out Of Options | shares 5,133,900 5,133,900      
Weighted Average Remaining Life 3 years 3 months 26 days 3 years 3 months 26 days      
Weighted Average Exercise Price ₨ 680.00 ₨ 680.00      
Employees Stock Option Scheme | Plan "E"          
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]          
Range of exercise price, Lower Range | (per share) 440.16 ₨ 6.64      
Range of exercise price, Upper Range | (per share) ₨ 680.00 ₨ 10.26      
Number Of Shares Arising Out Of Options | shares 37,850,200 37,850,200      
Weighted Average Remaining Life 2 years 5 months 27 days 2 years 5 months 27 days      
Weighted Average Exercise Price ₨ 598.71 ₨ 598.71      
Employees Stock Option Scheme | 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 ₨ 12.61      
Range of exercise price, Upper Range | (per share) ₨ 1,097.80 ₨ 16.57      
Number Of Shares Arising Out Of Options | shares 79,929,400 79,929,400      
Weighted Average Remaining Life 4 years 9 months 18 days 4 years 9 months 18 days      
Weighted Average Exercise Price ₨ 975.41 ₨ 975.41