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Employee Benefits - Summary of Employee Benefit Costs (Detail) - INR (₨) ₨ in Millions | 12 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
Disclosure Of employee benefits cost [Line Items] |  |  |
Employee benefit cost | ₨ 272,223 | ₨ 268,081 | ₨ 245,534
Cost of revenues [member] |  |  |
Disclosure Of employee benefits cost [Line Items] |  |  |
Employee benefit cost | 228,937 | 226,595 | 207,747
Selling and marketing expenses [member] |  |  |
Disclosure Of employee benefits cost [Line Items] |  |  |
Employee benefit cost | 28,070 | 26,051 | 23,663
General and administrative expenses [member] |  |  |
Disclosure Of employee benefits cost [Line Items] |  |  |
Employee benefit cost | ₨ 15,216 | ₨ 15,435 | ₨ 14,124

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