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Inventories - Schedule of Inventories (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Classes of current inventories [abstract]      
Stores and spare parts ₨ 769   ₨ 808
Raw materials and components     1
Finished goods and traded goods 2,601   3,106
Inventories ₨ 3,370 $ 52 ₨ 3,915