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Revenue - Summary of Revenue from Products and Services (Detail)
₨ in Millions, $ in Millions
12 Months Ended
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