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Summary of Significant Accounting Policies - Additional Information (Detail)
$ in Millions
12 Months Ended
Mar. 31, 2017
INR (₨)
Segment
Mar. 31, 2017
USD ($)
Mar. 31, 2016
INR (₨)
[1]
Significant Accounting Policies [Line Items]      
Fair values of amortized cost 95.00% 95.00%  
Reportable segments | Segment 3    
Debt issuance cost ₨ 68,300,000 $ 1.1 ₨ 0
Financial statements translation rate, Indian rupees (Rs.) equivalence of U.S. $1 | ₨ 64.85    
ASU 2015-03 and ASU 2015-15      
Significant Accounting Policies [Line Items]      
Debt issuance cost ₨ 68,300,000 $ 1.1  
Retail Loans | Personal loans/Credit card      
Significant Accounting Policies [Line Items]      
Loans charge off period 180 days    
Retail Loans | Auto Loans, Commercial Vehicle and Construction Equipment Finance      
Significant Accounting Policies [Line Items]      
Loans charge off period 180 days    
Retail Loans | Housing loans      
Significant Accounting Policies [Line Items]      
Loans charge off period 720 days    
Retail Loans | Retail Business Banking      
Significant Accounting Policies [Line Items]      
Loans charge off period Customer by customer basis    
Minimum      
Significant Accounting Policies [Line Items]      
Bank voting rights 20.00% 20.00%  
Minimum | Retail Loans      
Significant Accounting Policies [Line Items]      
Loans charge off period 180 days    
Maximum      
Significant Accounting Policies [Line Items]      
Bank voting rights 50.00% 50.00%  
Maximum | Retail Loans      
Significant Accounting Policies [Line Items]      
Loans charge off period 1083 days    
[1] The Bank has adopted the provisions of ASU 2015-03- "Interest-Imputation of Interest (subtopic 835-30)", prospectively. Refer to note 2(w)