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Employee Benefits - Summary of Employee Benefit Costs (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
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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

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