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Finance Expenses - Summary of Finance Expense (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Disclosure of finance expense [abstract]        
Interest expense ₨ 5,136   ₨ 5,616 ₨ 3,451
Exchange fluctuation on foreign currency borrowings, net 2,192   1,759 2,379
Total ₨ 7,328 $ 97 ₨ 7,375 ₨ 5,830