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Retirement Benefits - Additional Information (Detail)
₨ in Thousands, $ in Millions
 12 Months Ended
Mar. 31, 2022
INR (₨)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
INR (₨)
Mar. 31, 2020
INR (₨)
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, expected contribution to the plan for the next fiscal year ₨ 1,804,600      
Defined benefit plan, accumulated benefit obligation 6,914,800   ₨ 5,455,600  
Defined contribution plan, employer contribution recognized as an expense ₨ 6,844,700   5,429,600 ₨ 4,901,400
Superannuation        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary 13.00% 13.00%    
Defined contribution plan, employer contribution recognized as an expense ₨ 1,795,300   1,513,700 ₨ 1,269,900
Superannuation | Managing Director, Executive Directors and for certain employees of CBoP        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary (15.00%) (15.00%)    
Provident Fund        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer annual contribution as a percentage of eligible annual salary 12.00% 12.00%    
Provident Fund Administered by Regional Provident Fund Commissioner        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan - contribution to Pension Scheme administered by Regional Provident Fund Commissioner, percentage considered - lower of the percentage of employees eligible salary or fixed amount 8.33% 8.33%    
Provident Fund Administered by Regional Provident Fund Commissioner | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Employer contributions ₨ 15      
National Pension Scheme [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer contribution recognized as an expense ₨ 57,200   46,300  
Gratuity        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, number of days of eligible salary payable for each completed year of service 15 days 15 days    
Defined benefit plan, vesting period 15 years 15 years    
Employer contributions ₨ 1,633,000 $ 21.5 1,384,800  
Gratuity | Centurion Bank of Punjab Limited        
Defined Benefit Plan Disclosure [Line Items]        
Lock-in-period after which contribution made for employees stand frozen and will be converted into an annuity on separation 2 years 2 years    
Gratuity | Vested accumulated benefit obligation        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, accumulated benefit obligation ₨ 6,397,400   4,727,700  
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, expected contribution to the plan for the next fiscal year 188,600      
Defined benefit plan, accumulated benefit obligation 354,600   364,200  
Employer contributions ₨ 207,000 $ 2.7 23,000  
Pension | Centurion Bank of Punjab Limited        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, employer contribution as a percentage of basic salary 10.00% 10.00%    
Pension | Centurion Bank of Punjab Limited | Minimum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit pension plan, Service period of employees for whom contribution made stand frozen and will be converted into an annuity on separation 10 years 10 years    
Pension | Centurion Bank of Punjab Limited | Maximum        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit pension plan, Service period of employees for whom contribution made stand frozen and will be converted into an annuity on separation 15 years 15 years    
Pension | Vested accumulated benefit obligation        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, accumulated benefit obligation ₨ 353,800   ₨ 362,900