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Funded Status of Pension Plan and Amounts Recognized in Bank's Financial Statements (Detail) - Pension
₨ in Millions, $ in Millions
12 Months Ended
Mar. 31, 2017
INR (₨)
Mar. 31, 2017
USD ($)
Mar. 31, 2016
INR (₨)
Mar. 31, 2015
INR (₨)
Mar. 31, 2017
USD ($)
Change in benefit obligations:          
Projected benefit obligation ("PBO"), beginning of the period ₨ 696.8 $ 10.7 ₨ 574.4    
Service cost 12.9 0.2 9.9 ₨ 10.2  
Interest cost 53.4 0.8 44.9 43.7  
Actuarial (gains)/losses 25.3 0.4 169.4    
Benefits paid (66.2) (1.0) (101.8)    
Projected benefit obligation, end of the period 722.2 11.1 696.8 574.4  
Change in plan assets:          
Fair value of plan assets, beginning of the period 383.8 5.9 419.1    
Expected return on plan assets 26.1 0.4 32.1 36.0  
Actuarial gains/(losses) 7.6 0.1 14.3    
Actual return on plan assets 33.7 0.5 46.4    
Employer contributions 10.3 0.2 20.1    
Benefits paid (66.2) (1.0) (101.8)    
Fair value of plan assets, end of the period 361.6 $ 5.6 383.8 ₨ 419.1  
Funded Status ₨ (360.6)   ₨ (313.0)   $ (5.5)