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Goodwill and Intangible Assets - Summary of Allocation of Goodwill to CGUs (Detail) ₨ in Millions, $ in Millions | Mar. 31, 2018 INR (₨) | Mar. 31, 2018 USD ($) | Mar. 31, 2017 INR (₨) | Mar. 31, 2016 INR (₨)
--- | --- | --- | --- | ---
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | ₨ 117,584 | $ 1,806 | ₨ 125,796 | ₨ 101,991
Banking Financial Services and Insurance (BFSI) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 17,475 |  | 19,826 |
Healthcare and Lifesciences (HLS) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 49,085 |  | 48,144 |
Consumer Business Unit (CBU) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 14,776 |  | 17,442 |
Energy, Natural Resources and Utilities (ENU) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 14,863 |  | 16,393 |
Manufacturing and Technology (MNT) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | 20,406 |  | 23,086 |
Communications (COMM) [member] |  |  |  |
Disclosure of information for cash-generating units [line items] |  |  |  |
Goodwill | ₨ 979 |  | ₨ 905 |

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