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Estimated Amortization Expense for Intangible Assets (Detail) - Mar. 31, 2018
₨ in Millions, $ in Millions
INR (₨)
USD ($)
To be amortized during the twelve months ending March 31:    
2019 ₨ 1.0 $ 0.0
2020 0.0 0.0
2021 0.0 0.0
2022 0.0 0.0
2023 ₨ 0.0 $ 0.0