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Revenue - Summary of Revenue from Products and Services (Detail) ₨ in Millions, $ in Millions | 12 Months Ended
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Mar. 31, 2019 INR (₨) | Mar. 31, 2019 USD ($) | Mar. 31, 2018 INR (₨) | Mar. 31, 2017 INR (₨)
Revenue [abstract] |  |  |  |
Rendering of services | ₨ 571,301 |  | ₨ 524,543 | ₨ 522,061
Sales of products | 14,544 |  | 20,328 | 28,341
Total revenues | ₨ 585,845 | $ 8,471 | ₨ 544,871 | ₨ 550,402

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