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Funded Status of Gratuity Plan and Amounts Recognized in Bank's Financial Statements (Detail) - Gratuity
₨ 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 ₨ 3,590.6 $ 55.4 ₨ 3,105.9    
Service cost 860.6 13.3 513.3 ₨ 504.7  
Interest cost 454.6 7.0 256.1 182.4  
Actuarial(gains)/ losses 774.5 11.9 (41.7)    
Benefits paid (454.7) (7.0) (243.0)    
Projected benefit obligation, end of the period 5,225.6 80.6 3,590.6 3,105.9  
Change in plan assets:          
Fair value of plan assets, beginning of the period 2,879.3 44.4 2,428.8    
Expected return on plan assets 389.7 6.0 212.3 166.2  
Actuarial gains/(losses) 486.9 7.5 (136.9)    
Actual return on plan assets 876.6 13.5 75.4    
Employer contributions 601.0 9.3 618.1    
Benefits paid (454.7) (7.0) (243.0)    
Fair value of plan assets, end of the period 3,902.2 $ 60.2 2,879.3 ₨ 2,428.8  
Funded Status ₨ (1,323.4)   ₨ (711.3)   $ (20.4)