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Revenue - Summary of Revenue from Products and Services (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Revenue [abstract]        
Rendering of services ₨ 524,543   ₨ 522,061 ₨ 481,369
Sales of products 20,328   28,341 31,071
Total revenues ₨ 544,871 $ 8,368 ₨ 550,402 ₨ 512,440