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Finance Expense - Summary of Finance Expense (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Mar. 31, 2016
INR (₨)
Disclosure of finance expense [abstract]        
Interest expense ₨ 3,451   ₨ 2,675 ₨ 1,206
Exchange fluctuation on foreign currency borrowings, net 2,379   3,267 4,172
Total ₨ 5,830 $ 90 ₨ 5,942 ₨ 5,378