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Funded Status of Gratuity Plan and Amounts Recognized in Bank's Financial Statements (Detail) - Gratuity
$ in Thousands, ₨ in Millions
 12 Months Ended
Mar. 31, 2021
INR (₨)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
INR (₨)
Mar. 31, 2019
INR (₨)
Mar. 31, 2021
USD ($)
Change in benefit obligations:          
Projected benefit obligation ("PBO"), beginning of the period ₨ 7,883.0 $ 107,800 ₨ 6,653.5    
Service cost 1,107.0 15,100 965.4 ₨ 820.6  
Interest cost 561.6 7,700 483.3 476.7  
Actuarial(gains)/ losses 759.4 10,400 368.9    
Benefits paid (491.4) (6,700) (588.1)    
Projected benefit obligation, end of the period 9,819.6 134,300 7,883.0 6,653.5  
Change in plan assets:          
Fair value of plan assets, beginning of the period 5,779.8 79,100 5,501.8    
Expected return on plan assets 448.4 6,100 389.9 347.4  
Actuarial gains/(losses) 1,223.0 16,700 (620.5)    
Actual return on plan assets 1,671.4 22,800 (230.6)    
Employer contributions 1,384.8 18,900 1,096.7    
Benefits paid (491.4) (6,700) (588.1)    
Fair value of plan assets, end of the period 8,344.6 $ 114,100 5,779.8 ₨ 5,501.8  
Funded Status ₨ (1,475.0)   ₨ (2,103.2)   $ (20,200)