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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, 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 ₨ 677.6 $ 9.0 ₨ 722.8    
Service cost 6.5 0.1 7.7 ₨ 7.6  
Interest cost 45.3 0.6 66.3 57.9  
Actuarial (gains)/losses 15.3 0.2 6.5    
Benefits paid (146.5) (1.9) (125.7)    
Projected benefit obligation, end of the period 598.2 8.0 677.6 722.8  
Change in plan assets:          
Fair value of plan assets, beginning of the period 219.5 2.9 313.0    
Expected return on plan assets 11.0 0.1 18.6 23.6  
Actuarial gains/(losses) 2.9 0.0 4.8    
Actual return on plan assets 13.9 0.1 23.4    
Employer contributions 8.3 0.1 8.8    
Benefits paid (146.5) (1.9) (125.7)    
Fair value of plan assets, end of the period 95.2 $ 1.2 219.5 ₨ 313.0  
Funded Status ₨ (503.0)   ₨ (458.1)   $ (6.8)