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Finance Expense - Summary of Finance Expense (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
Disclosure of finance expense [abstract]        
Interest expense ₨ 5,616   ₨ 3,451 ₨ 2,675
Exchange fluctuation on foreign currency borrowings, net 1,759   2,379 3,267
Total ₨ 7,375 $ 107 ₨ 5,830 ₨ 5,942