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Activity in Options Outstanding under Employee Stock Option Scheme, Employees Stock Option Schemes (Detail) - ₨ / shares
 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Weighted Average Exercise Price      
Options outstanding, beginning of period ₨ 773.7    
Options outstanding, end of period ₨ 952.4 ₨ 773.7  
Employees Stock Option Scheme      
Options      
Options outstanding, beginning of period 109,033,000 92,476,600 65,443,045
Granted 44,836,200 41,659,000 47,060,000
Exercised [1] (21,691,200) (22,700,740) (18,903,115)
Forfeited (3,466,800) (2,296,500) (1,017,800)
Lapsed (56,900) (105,360) (105,530)
Options outstanding, end of period 128,654,300 109,033,000 92,476,600
Options exercisable, end of period 49,681,000 41,871,400 46,137,600
Weighted Average Exercise Price      
Options outstanding, beginning of period ₨ 683.16 ₨ 556.06 ₨ 417.32
Granted 1,092.65 835.50 679.99
Exercised [1] 563.78 438.50 382.63
Forfeited 900.81 761.32 618.30
Lapsed 546.78 368.42 247.18
Options outstanding, end of period 840.19 683.16 556.06
Options exercisable, end of period 661.84 537.99 431.59
Weighted average fair value of options granted during the year ₨ 377.69 ₨ 302.31 ₨ 258.53
[1] As of March 31, 2014 excludes 728,290 options of equity shares allotted which were exercised in previous year.