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Loans - Additional Information (Detail)
₨ in Millions, $ in Millions
Mar. 31, 2018
INR (₨)
Mar. 31, 2018
USD ($)
Mar. 31, 2017
INR (₨)
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Loans pledged as collateral for borrowings ₨ 665,906.2 $ 10,227.4 ₨ 187,653.3