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Activity in Options Outstanding under Employee Stock Option Scheme, Employees Stock Option Schemes (Detail) - ₨ / shares
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Weighted Average Exercise Price      
Options outstanding, beginning of period ₨ 680.0    
Options outstanding, end of period ₨ 773.7 ₨ 680.0  
Employees Stock Option Scheme      
Options      
Options outstanding, beginning of period 92,476,600 65,443,045 99,872,740
Granted 41,659,000 47,060,000 0
Exercised [1] (22,700,740) (18,903,115) (33,459,050)
Forfeited (2,296,500) (1,017,800) (848,800)
Lapsed (105,360) (105,530) (121,845)
Options outstanding, end of period 109,033,000 92,476,600 65,443,045
Options exercisable, end of period 41,871,400 46,137,600 56,752,845
Weighted Average Exercise Price      
Options outstanding, beginning of period ₨ 556.06 ₨ 417.32 ₨ 389.52
Granted 835.50 679.99 0.00
Exercised [1] 438.50 382.63 333.87
Forfeited 761.32 618.30 461.85
Lapsed 368.42 247.18 236.79
Options outstanding, end of period 683.16 556.06 417.32
Options exercisable, end of period 537.99 431.59 409.46
Weighted average fair value of options granted during the year ₨ 302.31 ₨ 258.53 ₨ 0.00
[1] As of March 31, 2013 includes 728,290 options exercised, pending allotment of equity shares. As of March 31, 2014 excludes 728,290 options of equity shares allotted which were exercised in previous year.