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Revenue - Summary of Revenue from Products and Services (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Revenue [abstract]        
Rendering of services ₨ 598,550   ₨ 571,301 ₨ 524,543
Sales of products 11,682   14,544 20,328
Total revenues ₨ 610,232 $ 8,094 ₨ 585,845 ₨ 544,871