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Other Assets (Parenthetical) (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Other Assets Disclosure [Line Items]      
Other assets [1] ₨ 60,526.7 $ 875.4 ₨ 49,565.5
ASU 2016-01      
Other Assets Disclosure [Line Items]      
Unrealised gain recognized in non-interest revenue-other, net 6,717.5    
ASU 2016-01 | Equity securities      
Other Assets Disclosure [Line Items]      
Other assets 11,483.4   1,267.7
ASU 2016-01 | Equity securities | Non Marketable Equity Securities [Member]      
Other Assets Disclosure [Line Items]      
Other assets ₨ 459.4   ₨ 708.4
[1] Effective April 1, 2018, the Bank adopted ASU 2016-01(See note 2(w)(ii) to the Consolidated Financial Statements for additional details). The equity securities that were previously reported as AFS securities were reclassified to other assets with carrying value amounting to Rs. 1,267.7 million. Others include equity securities with carrying value amounting to Rs. 1,267.7 million and Rs. 11,483.4 million as at March 31, 2018 and March 31, 2019, respectively. Equity securities include non-marketable equity securities carried at cost Rs. 708.4 million and Rs. 459.4 million as at March 31, 2018 and March 31, 2019, respectively. Unrealised gain recognized in non-interest revenue-other, net Rs 6,717.5 million for the fiscal year ended March 31 2019.