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Retirement Benefits - Additional Information (Detail)
$ in Millions
 12 Months Ended
Mar. 31, 2019
INR (₨)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
INR (₨)
Mar. 31, 2017
INR (₨)
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 ₨ 1,034,100,000   ₨ 676,800,000 ₨ 786,700,000
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 ₨ 15,000      
Provident Fund and Regional Provident Fund Commissioner        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer contribution recognized as an expense 3,312,100,000   3,081,400,000 ₨ 2,920,000,000
National Pension Scheme [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Defined contribution plan, employer contribution recognized as an expense ₨ 32,700,000   27,600,000  
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 5 years 5 years    
Defined benefit plan, expected contribution to the plan for the next fiscal year ₨ 1,096,800,000      
Defined benefit plan, accumulated benefit obligation 3,777,300,000   3,363,100,000  
Employer contributions 1,023,700,000 $ 14.8 842,200,000  
Gratuity | Vested accumulated benefit obligation        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, accumulated benefit obligation 3,292,400,000   3,032,900,000  
Pension        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, expected contribution to the plan for the next fiscal year 140,500,000      
Defined benefit plan, accumulated benefit obligation 468,300,000   502,100,000  
Employer contributions 8,800,000 $ 0.1 9,400,000  
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%
Lock-in-period after which contribution made for employees stand frozen and will be converted into an annuity on separation       2 years
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
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
Pension | Vested accumulated benefit obligation        
Defined Benefit Plan Disclosure [Line Items]        
Defined benefit plan, accumulated benefit obligation ₨ 455,500,000   ₨ 473,700,000