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Regulatory Capital Requirements under Banking Regulations- Dividend (Detail) - INR (₨)
₨ / shares in Units, ₨ in Millions
12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Required transfer of after tax Indian GAAP profit to a non-distributable statutory reserve in order to pay dividends without prior RBI approval 25.00%    
Net income calculated under Indian GAAP ₨ 210,781.6    
Dividends declared ₨ 15.0 ₨ 13.0 ₨ 11.0
Indian GAAP      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividend payout, description of restrictions As per the RBI guidelines, the dividend payout (excluding dividend tax) for March 31, 2019 cannot exceed 35% of net income of Rs. 210,781.6 million as calculated under Indian GAAP.    
Indian GAAP | Maximum      
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]      
Dividend payout, maximum pay out as a percentage of net income calculated under Indian GAAP 35.00%