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Reconciliation of Beginning and Ending Balance of Unrecognized Tax Benefits (Detail)
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Income Tax Contingency [Line Items]      
Opening balance ₨ 648.3 $ 9.4 ₨ 648.3
Increase/(decrease) related to prior year tax positions 13,799.8 199.5 0.0
Closing balance ₨ 14,448.1 $ 208.9 ₨ 648.3