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Other Assets (Parenthetical) (Detail)
₨ in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2021
INR (₨)
Mar. 31, 2020
INR (₨)
Mar. 31, 2021
USD ($)
Other Assets Disclosure [Line Items]      
Other assets [1] ₨ 89,850.5 ₨ 44,552.6 $ 1,228.5
Unrealized gain \ (loss) recognized in non-interest revenue–other, net 7,618.1 131.1  
Equity securities      
Other Assets Disclosure [Line Items]      
Other assets 20,600.1 11,611.2  
Equity securities | Non Marketable Equity Securities [Member]      
Other Assets Disclosure [Line Items]      
Other assets ₨ 999.2 ₨ 696.9  
[1] Others include equity securities with carrying value amounting to Rs. 11,611.2 million and Rs. 20, 600.1 million as at March 31, 2020 and March 31, 2021, respectively. Equity securities include non-marketable equity securities carried at cost Rs. 696.9 million and Rs. 999.2 million as at March 31, 2020 and March 31, 2021, respectively. Unrealized gain \ (loss) recognized in non-interest revenue–other, net Rs. (131.1) million and Rs. 7,618.1 million for the fiscal year ended March 31, 2020 and March 31, 2021, respectively.