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Future Minimum Lease Payments (Detail) - Mar. 31, 2018
₨ in Millions, $ in Millions
INR (₨)
USD ($)
Operating Leased Assets [Line Items]    
2019 ₨ 10,124.2 $ 155.5
2020 9,363.1 143.8
2021 8,811.8 135.3
2022 7,908.5 121.5
2023 6,883.0 105.7
Thereafter 36,255.7 556.8
Total ₨ 79,346.3 $ 1,218.6