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Goodwill and Intangible Assets - Summary of Allocation of Goodwill to CGUs (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨)
--- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | ₨ 116,980 | $ 1,691 | ₨ 117,584 | ₨ 125,796
Banking Financial Services and Insurance (BFSI) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 17,713 |  | 17,475 |
Healthcare and Lifesciences (HLS) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 50,670 |  | 49,085 |
Consumer Business Unit (CBU) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 13,587 |  | 14,776 |
Energy, Natural Resources and Utilities (ENU) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 15,203 |  | 14,863 |
Manufacturing and Technology (MNT) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill |  |  | 20,406 |
Communications (COMM) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 970 |  | ₨ 979 |
Manufacturing Segment [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 8,991 |  |  |
Technology segment [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | ₨ 9,846 |  |  |

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