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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, 2020
INR (₨)
Mar. 31, 2020
USD ($)
Mar. 31, 2019
INR (₨)
Mar. 31, 2018
INR (₨)
Mar. 31, 2020
USD ($)
Change in benefit obligations:          
Projected benefit obligation ("PBO"), beginning of the period ₨ 6,653.5 $ 88.3 ₨ 5,975.5    
Service cost 965.4 12.8 820.6 ₨ 741.0  
Interest cost 483.3 6.4 476.7 392.2  
Actuarial(gains)/ losses 368.9 4.9 (46.4)    
Benefits paid (588.1) (7.8) (572.9)    
Projected benefit obligation, end of the period 7,883.0 104.6 6,653.5 5,975.5  
Change in plan assets:          
Fair value of plan assets, beginning of the period 5,501.8 73.0 4,573.4    
Expected return on plan assets 389.9 5.2 347.4 297.4  
Actuarial gains/(losses) (620.5) (8.2) 130.2    
Actual return on plan assets (230.6) (3.0) 477.6    
Employer contributions 1,096.7 14.5 1,023.7    
Benefits paid (588.1) (7.8) (572.9)    
Fair value of plan assets, end of the period 5,779.8 $ 76.7 5,501.8 ₨ 4,573.4  
Funded Status ₨ (2,103.2)   ₨ (1,151.7)   $ (27.9)