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Activity in Options Outstanding under Employee Stock Option Scheme, Employees Stock Option Schemes (Parenthetical) (Detail) - Employees Stock Option Scheme - shares
 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options exercised [1] 22,700,740 18,903,115 33,459,050
Pending Allotment of Equity Share      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options exercised     728,290
Options exercised previous period allotted   728,290  
[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.