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Employee Benefits - Summary of Employee Benefit Costs (Detail) - INR (₨)
₨ in Millions
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure Of employee benefits cost [Line Items]      
Employee benefit cost ₨ 299,774 ₨ 272,223 ₨ 268,081
Cost of revenues [member]      
Disclosure Of employee benefits cost [Line Items]      
Employee benefit cost 251,818 228,937 226,595
Selling and marketing expenses [member]      
Disclosure Of employee benefits cost [Line Items]      
Employee benefit cost 30,972 28,070 26,051
General and administrative expenses [member]      
Disclosure Of employee benefits cost [Line Items]      
Employee benefit cost ₨ 16,984 ₨ 15,216 ₨ 15,435